Author: "F. Recchia" / Topic: nuclear and high energy physics - Searchworks@Jio Institute Digital Library Search Results

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111 results on '"F. Recchia"'

1. Conceptual design of the AGATA 2π array at LNL

Author: J.J. Valiente-Dobón, R. Menegazzo, A. Goasduff, D. Agguiaro, P. Aguilera, F. Angelini, M. Balogh, D. Bazzacco, J. Benito, G. Benzoni, N. Bez, M. Bolognesi, S. Bottoni, D. Brugnara, S. Carollo, P. Cocconi, A. Cogo, J. Collado, F.C.L. Crespi, A. Ertoprak, R. Escudeiro, F. Galtarossa, E.R. Gamba, A. Gambalonga, B. Góngora Servín, A. Gottardo, A. Gozzelino, M. Gulmini, Z. Huang, T. Marchi, D. Mengoni, P. Modanese, D.R. Napoli, J. Pellumaj, R.M. Pérez-Vidal, S. Pigliapoco, E. Pilotto, L. Ramina, M. Rampazzo, W. Raniero, M. Rebeschini, K. Rezynkina, D. Rosso, M. Scarcioffolo, D. Scarpa, M. Sedlák, R. Smith, N. Toniolo, F. Veronese, V. Volpe, L. Zago, I. Zanon, G. Zhang, R. Abels, M.L. Allegrini, C. Aufranc, G. Baulieu, C. Belkhiria, M. Benettoni, D. Benini, M. Bentley, M. Biasotto, M. Blaizot, J. Blasco Miquel, C. Boiano, A. Boston, H. Boston, A. Boujrad, P. Bourgault, A. Bracco, S. Brambilla, I. Burrows, F. Camera, S. Capra, A. Capsoni, R. Cash, J.V. Civera, E. Clément, S. Coelli, M. Cordwell, L. Corradi, S. Coudert, G. De Angelis, L. De Ruvo, G. Debras, M. Del Fabbro, J. Diklić, N. Dosme, G. Duchene, B. Duclos, J. Dudouet, J. Eberth, S. Elloumi, C. Everett, S. Fantinel, M. Fillinger, E. Fioretto, C. Fransen, A. Gadea, L. Gibelin, V. González, J. Goupil, C. Görgen, A. Grant, K. Green, J. Ha, T. Hartnett, K. Henseler, H. Hess, R. Hirsch, C. Houarner, J. Jacob, T. Joannem, D.S. Judson, N. Karkour, M. Karolak, M. Kebbiri, J. Kieffer, M. Labiche, X. Lafay, P. Le Jeannic, A. Lefevre, E. Legay, F. Legruel, S. Lenzi, S. Leoni, D. Linget, M. Liptrot, A. López-Martens, A. Lotodé, L. Manara, L. Ménager, T. Mijatović, B. Million, A. Minarello, G. Montagnoli, P. Morrall, I. Mullacrane, J. Nyberg, G. Philippon, M. Polettini, F. Popieul, A. Pullia, F. Recchia, P. Reiter, G. Richardt, M. Rocchini, A. Roger, F. Saillant, E. Sanchis, Md.S.R. Laskar, G. Secci, M.-H. Sigward, J. Simpson, N. Solenne, F. Spee, A.M. Stefanini, O. Stézowski, S. Szilner, N. Templeton, Ch. Theisen, S. Thiel, F. Tomasi, S. Tzvetkov, D. Vigano, E. Viscione, O. Wieland, K. Wimmer, G. Wittwer, M. Zielińska, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: AGATA spectrometer, DANTE detector, EUCLIDES detector, LNL facility, Plunger device, PRISMA spectrometer, Pulse shape analysis, TRACE detector, γ-ray tracking, Nuclear and High Energy Physics, Settore FIS/04 - Fisica Nucleare e Subnucleare, ray tracking, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation
Abstract: International audience; The Advanced GAmma Tracking Array (AGATA) has been installed at Laboratori Nazionali di Legnaro (LNL), Italy. In this installation, AGATA will consist, at the beginning, of 13 AGATA triple clusters (ATCs) with an angular coverage of 1π, and progressively the number of ATCs will increase up to a 2π angular coverage. This setup will exploit both stable and radioactive ion beams delivered by the Tandem–PIAVE-ALPI accelerator complex and the SPES facility. The new implementation of AGATA at LNL will be used in two different configurations, firstly one coupled to the PRISMA large-acceptance magnetic spectrometer and lately a second one at Zero Degrees, along the beam line. These two configurations will allow us to cover a broad physics program, using different reaction mechanisms, such as Coulomb excitation, fusion-evaporation, transfer and fission at energies close to the Coulomb barrier. These setups have been designed to be coupled with a large variety of complementary detectors such as charged particle detectors, neutron detectors, heavy-ion detectors, high-energy γ-ray arrays, cryogenic and gasjet targets and the plunger device for lifetime measurements. We present in this paper the conceptual design, characteristics and performance figures of this implementation of AGATA at LNL.
Published: 2023

2. Applications of Rutherford backscattering analysis methods to nuclear physics experiments

Author: M. Siciliano, F. Camera, P. J. Napiorkowski, A. Perego, D. Testov, E. Pasquali, D. Mengoni, M. Matejska-Minda, P. R. John, A. Goasduff, D. T. Doherty, K. Wrzosek-Lipska, M. Komorowska, F. Recchia, M. Rocchini, D. Bazzacco, Caroline Czelusniak, M. Ottanelli, L. Sottili, P. Sona, A. Nannini, N. Marchini, G. Benzoni, K. Hadynska-Klek, J. J. Valiente-Dobón, M. Zielińska, B. Melon, Massimo Chiari, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Detector, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Experimental nuclear physics, Low-energy Coulomb excitation, Rutherford backscattering spectroscopy, Silicon detectors, Nuclear physics, 0103 physical sciences, 010306 general physics, Spectroscopy, Instrumentation, Analysis method
Abstract: International audience; Target properties such as thickness and composition are essential ingredients in nuclear physics experiments, therefore, dedicated analyses to evaluate them before and/or after the measurement are often performed. In some experimental techniques, the exploited detectors allow for the evaluation of these properties on-line, i.e. directly during the experiment. In this paper, we report on the use of analysis methods coming from the Rutherford backscattering spectroscopy technique to obtain on-line information on the target used in a nuclear physics experiment. This measurement was performed at INFN LNL by exploiting the low-energy Coulomb excitation technique. The results have been compared with an independent Rutherford backscattering spectroscopy analysis of the same target performed at INFN LABEC in Florence.
Published: 2021

3. Mirror energy differences above the 0f7/2 shell: First γ-ray spectroscopy of the Tz = −2 nucleus 56Zn

Author: N. Imai, A. Jungclaus, M. A. Bentley, M.L. Cortés, T. Arici, S. Pigliapoco, Brenden Longfellow, D. R. Napoli, Victor Vaquero, R. Lozeva, X. Pereira-Lopez, Megumi Niikura, B. Mauss, P. Doornenbal, R. Yajzey, Dirk Rudolph, R. Taniuchi, Kathrin Wimmer, F. Recchia, Panu Ruotsalainen, Hiroyoshi Sakurai, F. Browne, N. Kitamura, S. Uthayakumaar, R. Wadsworth, A. Álvarez Fernández, T. Koiwai, S. M. Lenzi, Alfredo Poves, Spanish National Research Council [Madrid] (CSIC), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (INFN, Sezione di Padova), Istituto Nazionale di Fisica Nucleare (INFN), RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université Paris-Saclay, UAM. Departamento de Física Teórica, RIKEN Nishina Center for Accelerator-Based Science, Ministerio de Ciencia e Innovación (España), Swedish Research Council, and Science and Technology Facilities Council (UK)
Subjects: Nuclear and High Energy Physics, sinkki (metallit), QC1-999, Nuclear Theory, 01 natural sciences, nucleon removal, mirror nuclei, 0103 physical sciences, Subatomic Physics, medicine, 010306 general physics, Spectroscopy, radioactive ion beams, Nuclear Experiment, Nucleons, Physics, [PHYS]Physics [physics], isotoopit, Valence (chemistry), Isovector, 010308 nuclear & particles physics, Yrast, Física, Symmetry Breaking, medicine.anatomical_structure, isospin symmetry, shell-model calculations, Excited state, Energy Difference, Atomic physics, Multipole expansion, ydinfysiikka, Nucleus, Beam (structure)
Abstract: 5 pags., 4 figs., Excited states in Zn were populated following one-neutron removal from a Zn beam impinging on a Be target at intermediate energies in an experiment conducted at the Radioactive Isotope Beam Factory at RIKEN. Three γ rays were observed and tentatively assigned to the 6→4→2→0 yrast sequence. This turns Zn into the heaviest T=−2 nucleus in which excited states are known. The excitation-energy differences between these levels and the isobaric analogue states in the T=+2 mirror partner, Fe, are compared with large-scale shell-model calculations considering the full pf valence space and various isospin-breaking contributions. This comparison, together with an analysis of the mirror energy differences in the A=58, T=±1 pair Zn and Ni, provides valuable information with respect to the size of the monopole radial and the isovector multipole isospin-breaking terms in the region above doubly-magic Ni., We thank the RIKEN Nishina Center accelerator staff and the BigRIPS team for providing excellent beams to the experiment. This work was supported by the Spanish Ministerio de Ciencia e Inno- vación under contracts FPA2017-84756-C4-2-P, PGC-2018-94583, and SEV-2016-0597, the Swedish Research Council (Vetenskap- srådet, VR 2016-3969), and the UK Science and Technology Facil- ities Council (STFC) under grants ST/L005727/1 and ST/P003885/1. FB is supported by the RIKEN Special Postdoctoral Researcher Pro- gram
Published: 2021

4. Spectroscopy of the T = 2 mirror nuclei 48Fe/48Ti using mirrored knockout reactions

Author: F. Recchia, H. Iwasaki, Edward Simpson, D. Bazin, T. Haylett, E. Lunderberg, D. Kahl, R. Yajzey, P. C. Bender, P. J. Davies, X. Pereira-Lopez, R. Wadsworth, Brandon Elman, S. M. Lenzi, Brenden Longfellow, D. R. Napoli, N. Kobayashi, S. J. Lonsdale, Alexandra Gade, J. Belarge, M. A. Bentley, J. A. Tostevin, D. Weisshaar, L. Morris, and S. Uthayakumaar
Subjects: Physics, Nuclear and High Energy Physics, QC1-999, SHELL model, Nuclear Theory, Shell (structure), Context (language use), medicine.anatomical_structure, Excited state, medicine, Mirror nuclei, Atomic physics, Spectroscopy, Nuclear Experiment, Nucleus
Abstract: A sequence of excited states has been established for the first time in the proton-rich nucleus 48Fe (Z=26, N=22). The technique of mirrored (i.e. analogue) one-nucleon knockout reactions was applied, in which the T z = ±2 mirror pair, 48Fe/48Ti were populated via one-neutron/one-proton knockout from the secondary beams 49Fe/49V, respectively. The analogue properties of the reactions were used to help establish the new level scheme of 48Fe. The inclusive and exclusive cross sections were determined for the populated states. Large differences between the cross sections for the two mirrored reactions were observed and have been interpreted in terms of different degrees of binding of the mirror nuclei and in the context of the recent observations of suppression of spectroscopic strength as a function of nuclear binding, for knockout reactions on light solid targets. Mirror energy differences (MED) have been determined between the analogue T = 2 states and compared with the shell model predictions. MED for this mirror pair, due to their location in the shell, are especially sensitive to excitations out of the f 7 / 2 shell, and present a stringent test of the shell-model prescription.
Published: 2021

5. High-spin states in 212Po above the α-decaying (18+) isomer

Author: L. Zago, A. Gottardo, J.J. Valiente-Dobón, G. Benzoni, A. Gadea, M. Górska, S. Lunardi, Zs. Podolyák, P.H. Regan, D. Rudolph, A. Algora, G. de Angelis, D. Bazzacco, J. Benlliure, P. Boutachkov, A. Bracco, A.M. Bruce, F. Camera, E. Casarejos, M.L. Cortés, F.C.L. Crespi, A. Corsi, C. Domingo-Pardo, M. Doncel, T. Engert, H. Geissel, J. Gerl, A. Goasduff, N. Goel, J. Grebosz, E. Gregor, T. Habermann, S. Klupp, I. Kojouharov, N. Kurz, S.M. Lenzi, S. Leoni, S. Mandal, R. Menegazzo, D. Mengoni, B. Million, A.I. Morales, D.R. Napoli, F. Naqvi, C. Nociforo, M. Pfützner, S. Pietri, A. Prochazka, F. Recchia, E. Sahin, H. Schaffner, A. Sharma, B. Sitar, D. Siwal, P. Strmen, I. Szarka, C.A. Ur, P.M. Walker, H. Weick, O. Wieland, and H.-J. Wollersheim
Subjects: Nuclear and High Energy Physics
Published: 2022

6. High resolution gamma-ray spectrometry using GALILEO array

Author: D. Testov, J.J. Valiente-Dobon, D. Mengoni, F. Recchia, A. Goasduff, A. Boso, S. Lenzi, G. de Angelis, S. Bakes, C. Boiano, B. Cederwall, G. Colucci, M. Cicerchia, P. Colovic, F. Didierjean, M. Doncel, J.A. Duenas, F. Galtarossa, A. Gozzelino, K. Hadynska-Klek, R. Isocrate, G. Jaworski, P.R. John, H. Liu, S. Lunardi, R. Menegazzo, A. Mentana, V. Modamio, A. Nannini, D.R. Napoli, M. Palacz, G. Pasqualato, M. Rocchini, S. Riccetto, B. Saygi, E. Sahin, M. Siciliano, Yu. Sobolev, and S. Szilner
Subjects: Physics, γ -ray spectrometer, Nuclear and High Energy Physics, Radiation, Physics and Astronomy (miscellaneous), business.industry, Materials Science (miscellaneous), High resolution, γ -ray spectroscopy, nuclearstate lifetime, Condensed Matter Physics, lcsh:QC1-999, Optics, nuclear structure, Galileo (vibration training), business, lcsh:Physics, Gamma ray spectrometry
Abstract: The GALILEO γ -ray spectrometer has been constructed at the Legnaro National Laboratory of INFN (LNL-INFN). It can be coupled to advanced ancillary devices which allows nuclear structure studies employing the variety of in-beam γ -ray spectroscopy methods. Such studies benefit from reactions induced by the intense stable beams delivered by the Tandem-ALPI-PIAVE accelerator complex and by the radioactive beams which will be provided by the SPES facility. In this paper we outline two experiments performed within the experimental campaign at GALILEO coupled to the EUCLIDES Si-ball and the Neutron Wall array. The first one was aimed at spectroscopic studies in A=31 mirror nuclei and the second one at measurements of lifetimes of excited states in nuclei in the vicinity of 100 Sn.
Published: 2019

7. A powerful combination measurement for exploring the fusion reaction mechanisms induced by weakly bound nuclei

Author: Y. J. Yao, A. Boso, S. M. Lenzi, D. Mengoni, E. T. Li, G. L. Zhang, F. Recchia, F. Galtarossa, D. R. Napoli, G. X. Zhang, D. Bazzacco, D. A. Testov, Shi-Peng Hu, P. R. John, J. J. Valiente-Dobón, Alain Goasduff, X. Hao, R. Menegazzo, M. Siciliano, H. B. Sun, Huan-Qiao Zhang, and D. De Angelis
Subjects: Physics, Nuclear and High Energy Physics, Reaction mechanism, Fusion, Coincidence measurement, Spectrometer, 010308 nuclear & particles physics, Projectile, Charged-particle detector, Breakup, 01 natural sciences, Molecular physics, Coincidence, Charged particle, γ-ray detector, Fusion mechanisms, Instrumentation, 0103 physical sciences, Nuclear fusion, Nuclear Experiment, 010306 general physics
Abstract: The GALILEO array is a high-efficiency γ -ray spectrometer, resident at the Legnaro National Laboratory (LNL)in Italy, and it is currently used in combination with the Si-ball EUCLIDES for the detection of charged-particles. The combined setup was used in the 6 Li+89Y experiment with incident energies of 22 MeV and 34 MeV to investigate the influence of breakup and transfer of weakly bound projectile on the fusion process. Using the coincidence by the charged particles and γ -rays, the different reaction channels can be clearly identified and the different reaction mechanisms can be clearly studied. It is shown that this facility can be used well to explore the fusion reaction mechanisms induced by weakly bound nuclei.
Published: 2019

8. Lifetime measurement of the 21+ state in 74Rb and isospin properties of quadrupole transition strengths at N = Z

Author: A. Westerberg, C. M. Campbell, K. Whitmore, C. Langer, C. Walz, R. Wadsworth, E. Lunderberg, F. Recchia, V. M. Bader, D. Bazin, I. Y. Lee, A. Lemasson, T.R. Baugher, A. Dewald, Alexandra Gade, Thomas Braunroth, S. R. Stroberg, Kathrin Wimmer, D. Smalley, H. Iwasaki, J. S. Berryman, C. Morse, C. Loelius, and D. Weisshaar
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Isoscalar, State (functional analysis), 01 natural sciences, symbols.namesake, medicine.anatomical_structure, Recoil, Isospin, 0103 physical sciences, Quadrupole, medicine, symbols, Atomic physics, 010306 general physics, Nucleus, Doppler effect, Line (formation)
Abstract: Self-conjugate nuclei in the A ≈ 70 – 80 region have attracted a great deal of attention due to phenomena such as shape coexistence and increasing collectivity along the N = Z line. We investigate the structure of nuclei in this region through lifetime measurements using the GRETINA array. The first implementation of the Differential Recoil Distance Doppler Shift technique with fast radioactive beams is demonstrated and verified through a measurement of the well-known B ( E 2 ; 2 1 + → 0 1 + ) transition strength in 74Kr. The method is then applied to determine the B ( E 2 ; 2 1 + → 0 1 + ) transition strength in 74Rb, the heaviest odd–odd N = Z nucleus for which this quantity has been determined. This result and extended systematics along N = Z suggest the dominance of the isoscalar part of the quadrupole transition strengths in self-conjugate nuclei, as well as the possible presence of shape coexistence in 74Rb.
Published: 2018

9. The GALILEO γ-ray array at the Legnaro National Laboratories

Author: R. Menegazzo, I. Zanon, F. Veronese, D.A. Testov, J. Ha, N. Bez, B. Million, G. Pasqualato, Alberto Pullia, M. Biasotto, L. Ramina, S. Bottoni, C. A. Ur, M. L. Cortés, D. Mengoni, S. Coelli, G. Gosta, C. Fanin, M. Siciliano, A. Saltarelli, D. Bazzacco, D. Tomasella, J. J. Valiente-Dobón, S. Leoni, M. Romanato, S. Ventura, A. Gadea, N. Toniolo, Marco Bellato, Diego Barrientos, S. Brambilla, D. Brugnara, R.M. Pérez-Vidal, F. Recchia, F. C. L. Crespi, F.J. Egea, S. Lunardi, S. Capra, M. Rebeschini, S. Fantinel, G. Jaworski, A. Bracco, M. Gulmini, G. Rampazzo, M. Scarcioffolo, N. Blasi, J. Pellumaj, S. Pigliapoco, G. Benzoni, V. Volpe, P. Cocconi, A. Boso, O. Wieland, K. Hadyńska-Klȩk, E.R. Gamba, A. Capsoni, A. Gambalonga, E. Viscione, F. Camera, G. de Angelis, A. Nannini, Roberto Isocrate, C. Boiano, A. Illana, M. Rocchini, G. Zhang, A. Gottardo, A. Goasduff, C. Gesmundo, P. R. John, N. Marchini, S. Ziliani, K. Rezynkina, D. R. Napoli, E. Gregor, A. Gozzelino, D. Rosso, M. Rampazzo, V. Modamio, M. Polettini, M. Magalini, F. Tomasi, S. M. Lenzi, and C. Porzio
Subjects: Physics, Nuclear and High Energy Physics, Silicon, business.industry, Instrumentation, High-resolution γ-ray spectroscopy, Detector, Neutron, DAQ, Electronics, HPGe, Semiconductor detector, Optics, Data acquisition, Galileo (vibration training), business, Hpge detector
Abstract: GALILEO, a new 4 π high-resolution γ -detection array, based on HPGe detectors, has been developed and installed at the Legnaro National Laboratories. The GALILEO array greatly benefits from a fully-digital read-out chain, customized DAQ, and a variety of complementary detectors to improve the resolving power by the detection of particles, ions or high-energy γ -ray transitions. In this work, a full description of the array, including electronics and DAQ, is presented together with its complementary instrumentation.
Published: 2021

10. Angular distribution of $\gamma $ rays emitted by oriented nuclei: the case of $^{92}$Mo formed in the reaction $^6$Li+$^{89}$Y

Author: G. L. Zhang, M. J. Ermamatov, D. Testov, Shi-Peng Hu, A. Goasduff, F. Galtarossa, D. Bazzacco, F. Recchia, J. L. Ferreira, P. R. John, Y. F. Lv, B. Paes, G. X. Zhang, Huan-Qiao Zhang, M. Siciliano, M. Mazzocco, X. B. Qin, Jingcai Lu, E. N. Cardozo, Z. Huang, H. B. Sun, D. Mengoni, J. J. Valiente-Dobón, J. Lubian, H. M. Zhao, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, SHELL model, Hadron, Gamma ray, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Angular distribution, Excited state, 0103 physical sciences, Nuclear fusion, Atomic physics, 010306 general physics, Spin (physics), Hpge detector
Abstract: Gamma-ray angular distributions in oriented $$^{92}$$ Mo produced via the $$^{6}$$ Li+ $$^{89}$$ Y reaction were studied in this work. The characteristic $$\gamma $$ rays in $$^{92}$$ Mo were measured by means of the GALILEO array, which is composed of 25 Compton-suppressed HPGe detectors arranged in a nearly 2 $$\pi $$ geometry. A detailed analysis of the spin-alignment attenuation factors ( $$\alpha _2$$ ) for different excited states in $$^{92}$$ Mo was performed, by analyzing the measured angular distribution coefficients of several pure-E2 transitions. The relationship between $$\alpha _2$$ and the spin was established in $$^{92}$$ Mo and the 244-keV transition between the 5 $$^-_1$$ and 4 $$^+_1$$ states resulted to have a E1 + M2 character with a mixing ratio ( $$\delta $$ ) of $$-0.05^{+0.05}_{-0.06}$$ , consistent with shell model calculations.
Published: 2021

11. Transition probabilities in 31P and 31S : A test for isospin symmetry

Author: E. Sahin, S. Iliev, S. M. Lenzi, Dimitar Tonev, S. Lunardi, H.-F. Wirth, M. S. Yavahchova, N. Marginean, P. Pavlov, H. Laftchiev, R. Menegazzo, C. A. Ur, E. Farnea, R. P. Singh, G. de Angelis, F. Recchia, E. Geleva, A. Gadea, P. G. Bizzeti, C. Y. He, I.L. Pantaleev, D. R. Napoli, I. Deloncle, M. Stoyanova, Heikki Penttilä, G. De Gregorio, F. Nowacki, D.T. Dimitrov, N. Goutev, A. Demerdjiev, R. Orlandi, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Tonev, D., de Angelis, G., Deloncle, I., Goutev, N., De Gregorio, G., Pavlov, P., Pantaleev, I. L., Iliev, S., Yavahchova, M. S., Bizzeti, P. G., Demerdjiev, A., Dimitrov, D. T., Farnea, E., Gadea, A., Geleva, E., He, C. Y., Laftchiev, H., Lenzi, S. M., Lunardi, S., Marginean, N., Menegazzo, R., Napoli, D. R., Nowacki, F., Orlandi, R., Penttila, H., Recchia, F., Sahin, E., Singh, R. P., Stoyanova, M., Ur, C. A., and Wirth, H. -F.
Subjects: Nuclear and High Energy Physics, Lifetime measurement, Isoscalar, QC1-999, Lifetime measurements, lifetime measurements, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Resonance (particle physics), Isospin symmetry, transition probabilities, Nuclear physics, Microscopic multiphonon model, Mirror nuclei, mirror nuclei, 0103 physical sciences, Transition probabilities, 010306 general physics, mirror, Physics, Isovector, 010308 nuclear & particles physics, 31S, Charge (physics), 31P, Symmetry (physics), Charged particle, isospin symmetry, Isospin, microscopic multiphonon model, nuclei, ydinfysiikka
Abstract: International audience; Excited states in the mirror nuclei 31P and 31S were populated in the 1p and 1n exit channels of the reaction 20Ne + 12C, at a beam energy of 33 MeV. The 20Ne beam was delivered for the first time by the Piave-Alpi accelerator of the Laboratori Nazionali di Legnaro. Angular correlations of coincident γ-rays and Doppler-shift attenuation lifetime measurements were performed using the multi-detector array GASP in conjunction with the EUCLIDES charged particle detector. In the observed B(E1) strengths, the isoscalar component, amounting to 24% of the isovector one, provides strong evidence for breaking of the isospin symmetry in the A=31 mass region. Self-consistent beyond mean field calculations using Equation of Motion method based on a chiral potential and including two- and three-body forces reproduce well the experimental B(E1) strengths, reinforcing our conclusion. Coherent mixing from higher-lying states involving the Giant Isovector Monopole Resonance accounts well for the effect observed. The breaking of the isospin symmetry originates from the violation of the charge symmetry of the two- and three-body parts of the potential, only related to the Coulomb interaction.
Published: 2021

12. Coexisting normal and intruder configurations in $^{32}$Mg

Author: N. Imai, J. S. Berryman, T. Redpath, F. Nowacki, D. Barofsky, Alexandra Gade, G. Perdikakis, E. Lunderberg, T. Kröll, Alfredo Poves, D. Weisshaar, J. Lloyd, A. Westerberg, C. Langer, V. M. Bader, S. R. Stroberg, N. Kitamura, V. Bildstein, Kathrin Wimmer, D. Smalley, C. Bancroft, T.R. Baugher, F. Recchia, D. Bazin, Yutaka Utsuno, Noritaka Shimizu, S. Saenz, J. A. Tostevin, Japan Society for the Promotion of Science, Ministry of Education, Culture, Sports, Science and Technology (Japan), Ministerio de Ciencia, Innovación y Universidades (España), Science and Technology Facilities Council (UK), Department of Energy (US), National Science Foundation (US), UAM. Departamento de Física Teórica, Institut Pluridisciplinaire Hubert Curien (IPHC), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, QC1-999, SHELL model, Direct reactions, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Molecular physics, Momentum, Shell model, 0103 physical sciences, In-beam, Nuclear Experiment (nucl-ex), 010306 general physics, Spectroscopy, Nuclear Experiment, Nucleons, Physics, Neutrons, 010308 nuclear & particles physics, Island of inversion, Nuclear structure, Física, Observable, ray spectroscopy, In-beam γ-ray spectroscopy, Radioactive beams, Direct reaction
Abstract: 7 pags., 4 figs., Situated in the so-called "island of inversion," the nucleus $^{32}$Mg is considered as an archetypal example of the disappearance of magicity at $N=20$. We report on high statistics in-beam spectroscopy of $^{32}$Mg with a unique approach, in that two direct reaction probes with different sensitivities to the underlying nuclear structure are employed at the same time. More specifically, states in $^{32}$Mg were populated by knockout reactions starting from $^{33}$Mg and $^{34}$Si, lying inside and outside the island of inversion, respectively. The momentum distributions of the reaction residues and the cross sections leading to the individual final states were confronted with eikonal-based reaction calculations, yielding a significantly updated level scheme for $^{32}$Mg and spin-parity assignments. By fully exploiting observables obtained in this measurement, a variety of structures coexisting in 32Mg was unraveled. Comparisons with theoretical predictions based on shell-model overlaps allowed for clear discrimination between different structural models, revealing that the complete theoretical description of this key nucleus is yet to be achieved., N.K. acknowledges support of the Grant-in-Aid for JSPS Fellows (18J12542) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan. K.W. acknowledges support from the Ministerio de Ciencia e Innovación (Spain) through the Ramón y Cajal program RYC-2017-22007. A.P. is supported in part by the Ministerio de Ciencia, Innovación y Universidades (Spain), Severo Ochoa program SEV-2016-0597 and grant PGC-2018-94583. The SDPF-M calculations were enabled by the CNS-RIKEN joint project for large-scale nuclear structure calculations and were performed mainly on the Oakforest-PACS supercomputer. N.S. acknowledges support from “Priority Issue on post-K computer” (hp190160) and “Program for Promoting Researches on the Supercomputer Fugaku” (hp200130) by JICFuS and MEXT, Japan. J.A.T. acknowledges support from the U.K. Science and Technology Facilities Council Grant No. ST/L005743/1. This work was supported by the U.S. Department of Energy (DOE), Office of Science, Office of Nuclear Physics, under Grant No. DE-SC0020451 and by the U.S. National Science Foundation (NSF) under Grant No. PHY-1306297. GRETINA was funded by the U.S. DOE, Office of Science. Operation of the array at NSCL was supported by the U.S. NSF under Cooperative Agreement No. PHY-1102511 (NSCL) and DOE under Grant No. DE-AC02-05CH11231 (LBNL).
Published: 2021

13. Manifestation of the Berry phase in the atomic nucleus 213Pb

Author: S. Klupp, A. Algora, Roberto Menegazzo, D. Mengoni, F. Naqvi, J. J. Valiente-Dobón, S. Pietri, T. Habermann, J. Benlliure, Branislav Sitar, Alison Bruce, A. Bracco, P. Van Isacker, N. Kurz, Andrea Corsi, E. Sahin, Dirk Rudolph, Imrich Szarka, Helmut Weick, Zs. Podolyák, J. Gerl, J. Grebosz, Davinder Siwal, S. K. Mandal, S. Leoni, T. Engert, D. Bazzacco, A. Prochazka, M. Górska, F. Recchia, S. Lunardi, D. R. Napoli, Hans Geissel, P. Boutachkov, A. Gottardo, F. Camera, Enrique Casarejos, I. Kojouharov, P. H. Regan, E. Gregor, Oliver Wieland, H. J. Wollersheim, A. Sharma, G. de Angelis, C. Nociforo, F. C. L. Crespi, A. Goasduff, C. Domingo-Pardo, A. I. Morales, M. Pfützner, B. Million, G. Benzoni, M. L. Cortés, Philip M Walker, C. A. Ur, Peter Strmen, H. Schaffner, A. Gadea, Maria Doncel, N. Goel, S. M. Lenzi, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Nuclear and High Energy Physics, Angular momentum, nucl-th, Nuclear Theory, isomeric decays, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Nuclear Theory (nucl-th), 0103 physical sciences, Subatomic Physics, Nuclear Physics - Experiment, ddc:530, 22 Física, Nuclear Experiment (nucl-ex), 010306 general physics, Spectroscopy, Nuclear Experiment, Physics, Isotope, 010308 nuclear & particles physics, 2207 Física Atómica y Nuclear, Quantum number, lcsh:QC1-999, relativistic projectile fragmentation, ddc, Geometric phase, gamma-ray spectroscopy, Nuclear Physics - Theory, Atomic nucleus, Atomic number, Atomic physics, Nucleon, lcsh:Physics
Abstract: Physics letters / B 816, 136183 (2021). doi:10.1016/j.physletb.2021.136183, Published by North-Holland Publ., Amsterdam
Published: 2021

14. Lifetimes of core-excited states in semi-magic $$^{95}\mathrm {Rh}$$

Author: G. de Angelis, Eric Clément, Bo Cederwall, H. Al Azri, Mikael Sandzelius, Ulrika Jakobsson, C. M. Petrache, Chong Qi, S. S. Ghugre, V. Modamio, Zhigang Xiao, F. Ghazi Moradi, S. Erturk, G. Jaworski, Baki Akkuş, A. Algora, A. Ertoprak, M. Palacz, M. Doncel, C. Michelagnoli, Torbjörn Bäck, Eiji Ideguchi, A. Boso, H. W. Li, J. J. Valiente-Dobón, M. Siciliano, Zs. Dombradi, A. Gadea, T. Hüyük, Johan Nyberg, F. Recchia, R. Wadsworth, B. M. Nyakó, P. J. Davies, István Kuti, D. M. Debenham, D. R. Napoli, D. Sohler, A. Gottardo, János Timár, R. Raut, A. Atac, Department of Physics [Stockholm], Royal Institute of Technology [Stockholm] (KTH ), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Department of Physics, Royal Institute of Technology (KTH), 10691 Stockholm, Sweden
Subjects: [PHYS]Physics [physics], Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, 01 natural sciences, Core (optical fiber), symbols.namesake, Excited state, 0103 physical sciences, symbols, Nuclear fusion, Neutron, MAGIC (telescope), Atomic physics, 010306 general physics, Doppler effect, Line (formation)
Abstract: Lifetimes of negative-parity states have been determined in the neutron deficient semi-magic (N = 50) nucleus $$^{95}\mathrm {Rh}$$ 95 Rh . The fusion-evaporation reaction $$^{58}Ni(^{40}Ca, 3p)$$ 58 N i ( 40 C a , 3 p ) was used to populate high-spin states in $$^{95}\mathrm {Rh}$$ 95 Rh at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick $$6\;\mathrm {mg/cm}^2$$ 6 mg / cm 2 metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations.
Published: 2020

15. Evidence for pseudospin-chiral quartet bands in the presence of octupole correlations

Author: A. Ataç-Nyberg, M. Siciliano, K. Ortner, Bo Cederwall, E. A. Lawrie, Corina Andreoiu, Torbjörn Bäck, A. Goasduff, Miao Liu, E. Dupont, Y. H. Zhang, A. Tucholski, C. M. Petrache, Shishu Zhang, J. J. Valiente-Dobón, Y.Y. Wang, István Kuti, F. Recchia, Jie Meng, Y.P. Wang, Y. H. Qiang, D. Bazzacco, D. Mengoni, Song Guo, D. R. Napoli, Dóra Sohler, A. Astier, H.L. Fan, Jie Wang, T. Marchlewski, Xiaojuan Zhou, Pengwei Zhao, A. Boso, Guangsheng Li, F. H. Garcia, S. Riccetto, Y.K. Wang, B. F. Lv, F. Galtarossa, J. Srebrny, D. Testov, G. Jaworski, K. Whitmore, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Degenerate energy levels, High Energy Physics::Phenomenology, Nuclear structure, Parity (physics), Tilted axis cranking covariant density functional theory, 01 natural sciences, Molecular physics, lcsh:QC1-999, 0103 physical sciences, Octupole correlation, Pseudospin, Chirality, 010306 general physics, Chirality (chemistry), Reflection-asymmetric particle rotor model, lcsh:Physics
Abstract: Three nearly degenerate pairs of doublet bands are identified in $^{131}$Ba. Two of them, with positive-parity, are interpreted as pseudospin-chiral quartet bands. This is the first time that a complete set of chiral doublet bands built on the pseudospin partners π(d5/2,g7/2) is observed. The chiral bands with opposite parity built on 3-quasiparticle configurations are directly connected by many E1 transitions, without involving an intermediary non-chiral configuration. The observed band structures in $^{131}$Ba have been investigated by using the reflection-asymmetric particle rotor model. The energies and the electromagnetic transition ratios of the three pairs of doublet bands observed in $^{131}$Ba are reproduced and they are interpreted as chiral doublet bands with three-quasiparticle configurations. It is the first time that multiple chiral bands are observed in the presence of enhanced octupole correlations and pseudospin symmetry.
Published: 2020

16. SPIDER: A Silicon PIe DEtectoR for low-energy Coulomb-excitation measurements

Author: P. R. John, P. Cocconi, Massimo Chiari, M. Rampazzo, D. Testov, K. Hadyńska-Klȩk, L. Ramina, P. Sona, M. Siciliano, A. Perego, M. Komorowska, A. Goasduff, B. Melon, P. J. Napiorkowski, D. Rosso, D. Mengoni, G. Benzoni, M. Rocchini, J. J. Valiente-Dobón, A. Nannini, C. Czelusniak, D. Bazzacco, L. Sottili, M. Ottanelli, F. Camera, S. Bettarini, A. Tredici, M. Brianzi, D. T. Doherty, N. Marchini, M. Zielinska, E. Pasquali, M. Matejska-Minda, F. Recchia, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Subjects: Nuclear and High Energy Physics, Silicon, chemistry.chemical_element, Semiconductor detector performance and simulations, Coulomb excitation, Charge loss, 01 natural sciences, Ion, Coulomb-excitation, Radiation damage, Rutherford back-scattering, Silicon detectors, Optics, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Instrumentation, Physics, Spider, Spectrometer, 010308 nuclear & particles physics, business.industry, Detector, chemistry, AGATA, Galileo (vibration training), business
Abstract: International audience; SPIDER is a new array of segmented silicon detectors for low-energy Coulomb-excitation experiments, designed as an ancillary device for modern γ -ray spectrometers such as GALILEO and AGATA. Currently, it is used at the INFN Legnaro National Laboratories (LNL) for experiments with the GALILEO γ -ray array and the stable beams provided by the Tandem-XTU, ALPI-PIAVE accelerator complex. In this paper, a detailed description of SPIDER is presented, as well as the outcomes from the first in-beam experiment of the array coupled with GALILEO. In particular, radiation damage and cross-talk/charge-sharing effects induced by energetic heavy ions in SPIDER are investigated and the capabilities of the array to perform on-line Rutherford back-scattering analysis of the exploited target are presented. The material reported here can be used to plan future experiments with the GALILEO-SPIDER setup with the presently available stable beams at LNL and paves the way for future experimental campaigns with the radioactive beams provided in the near future by the SPES facility at LNL.
Published: 2020

17. Physics opportunities with the Advanced Gamma Tracking Array: AGATA

Author: W. Korten, A. Bracco, A. Atac, G. Benzoni, S. Leoni, P. Reiter, A. Goasduff, Eric Clément, K. A. Gladnishki, F. Recchia, A. Jungclaus, Bo Cederwall, G. Duchêne, D. G. Jenkins, A. Nannini, P. Bednarczyk, M. Zielińska, Dirk Rudolph, Riccardo Raabe, B. Million, A. Tumino, P. J. Nolan, D. R. Napoli, B. Fernández-Domínguez, F. Didierjean, Johan Nyberg, Herbert Hess, A. Gadea, D. Tonev, M. Ciemala, G. Rainovski, D. T. Doherty, Joakim Cederkäll, A. Obertelli, J. Gerl, J. J. Valiente-Dobón, B. Fornal, Begoña Quintana, J. Ljungvall, Ch. Theisen, Janne Pakarinen, G. de Angelis, P. R. John, M. Kmiecik, O. Wieland, Zs. Dombrádi, J. Simpson, A. J. Boston, M. Górska, Zs. Podolyák, D. Curien, J. Dudek, Norbert Pietralla, F. C. L. Crespi, A. Maj, K. Wimmer, Paul Greenlees, D. Beaumel, M. Labiche, A. Lopez-Martens, A. Korichi, M. A. Bentley, D. Mengoni, Liam Gaffney, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), AGATA, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ministerio de Ciencia, Innovación y Universidades (España), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Radioactive ion beams, Nuclear and High Energy Physics, NEUTRON-RICH, Position resolution, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Accelerator Physics and Instrumentation, Tracking (particle physics), 7. Clean energy, 01 natural sciences, Physics, Particles & Fields, Subatomär fysik, Optics, Subatomic Physics, 0103 physical sciences, Gamma spectroscopy, SPECTROMETER, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], SUPERHEAVY ELEMENTS, 010306 general physics, ROTATIONAL BAND, DETECTOR, Physics, Science & Technology, Spectrometer, 010308 nuclear & particles physics, business.industry, European research, Detector, Acceleratorfysik och instrumentering, FISSION-BARRIERS, PERFORMANCE, Physics, Nuclear, SPIN, Physical Sciences, SHELL-MODEL, AGATA, business, DECAY
Abstract: AGATA Collaboration, New physics opportunities are opening up by the Advanced Gamma Tracking Array, AGATA, as it evolves to the full 4π instrument. AGATA is a high-resolution γ-ray spectrometer, solely built from highly segmented high-purity Ge detectors, capable of measuring γ rays from a few tens of keV to beyond 10 MeV, with unprecedented efficiency, excellent position resolution for individual γ-ray interactions, and very high count-rate capability. As a travelling detector AGATA will be employed at all major current and near-future European research facilities delivering stable and radioactive ion beams., The AGATA project has been supported by the European Structural Funds FSE FEDER, the Academy of Finland FIRI program, Finland, the Direction de Recherches Fondamentales of CEA, France, the Institut National de Physique Nucléaire et de Physique des Particules (IN2P3) of CNRS, France, the Bundesministerium für Bildung und Forschung (BMBF), Germany, the Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), Hungary, the IstitutoNazionale di Fisica Nucleare (INFN), Italy, theNational Science Center (NCN), Poland, the Knut and AliceWallenberg foundation (Sweden), the Swedish Research Council, the Conselleria d’Educació, Investigació, Cultura i Esport, Generalitat Valenciana and Ministerio de Ciencia, Innovación y Universidades, Spain, the Türkiye Bilimsel ve Teknolojik Ara¸stirma Kurumu (TÜBITAK), Turkey, and the United Kingdom Research and Innovation – Science and Technology Facilities Council (UKRI-STFC).
Published: 2020

18. Low-lying electric dipole gamma-continuum for the unstable Fe-62,64 nuclei : Strength evolution with neutron number

Author: Eric Clément, B. Birkenbach, A. I. Morales, D. Bazzacco, H. J. Wollersheim, J. J. Valiente-Dobón, D. M. Cullen, L. J. Harkness-Brennan, M. Kmiecik, Alberto Pullia, C. Domingo-Pardo, Luis Sarmiento, C. Nociforo, N. Goel, B. Bruyneel, G. Rainovski, M.D. Salsac, S. Pietri, Begoña Quintana, J. Simpson, Pavel Golubev, T. Habermann, Johan Nyberg, R. Menegazzo, S. Leoni, M. Reese, V. Yu. Ponomarev, A. Maj, T. Arici, A. Gottardo, N. Kurz, M. Górska, S. Brambilla, I. Kojouharov, E. Merchan, M. L. Cortés, Stefano Riboldi, Enrique Sanchis, N. Lalović, Vicente González, R. Avigo, Norbert Pietralla, P. Reiter, F. Camera, M. Labiche, Zs. Podolyák, J. Gerl, D. Ralet, F. Ameil, Andreas Görgen, A. Gadea, A. Bracco, A. Jungclaus, G. Benzoni, O. Stezowski, Dirk Rudolph, D. Curien, J. Eberth, H. C. Boston, S. Bottoni, W. Korten, F. C. L. Crespi, N. Blasi, H. Schaffner, D. Mengoni, M. Lettmann, G. Duchêne, Diego Barrientos, P. H. Regan, F. Didierjean, M. Ciemala, P. Bednarczyk, G. Guastalla, B. Million, E. Gregor, Oliver Wieland, F. Recchia, D. R. Napoli, A. Atac, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Istituto Nazionale di Fisica Nucleare, Science and Technology Facilities Council (UK), Swedish Research Council, Federal Ministry of Education and Research (Germany), European Commission, Generalitat Valenciana, Ministerio de Economía y Competitividad (España), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Phonon, Astrophysics::High Energy Astrophysical Phenomena, Binding energy, Nuclear Theory, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, 64Fe, Dipole excitation around neutron threshold, 62Fe, Subatomär fysik, 0103 physical sciences, Subatomic Physics, ddc:530, Neutron, Nuclear Physics - Experiment, Nuclear structure, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, 62 Fe, Fe, 64, 64 Fe, lcsh:QC1-999, Dipole, Fe-64, Neutron number, Fe-62, AGATA, Atomic physics, lcsh:Physics
Abstract: 6 pags., 4 figs., The γ-ray emission from the nuclei Fe following Coulomb excitation at bombarding energy of 400-440 AMeV was measured with special focus on E1 transitions in the energy region 4-8 MeV. The unstable neutron-rich nuclei Fe were produced at the FAIR-GSI laboratories and selected with the FRS spectrometer. The γ decay was detected with AGATA. From the measured γ-ray spectra the summed E1 strength is extracted and compared to microscopic quasi-particle phonon model calculations. The trend of the E1 strength with increasing neutron number is found to be fairly well reproduced with calculations that assume a rather complex structure of the 1 states (three-phonon states) inducing a strong fragmentation of the E1 nuclear response below the neutron binding energy., This work was partially supported by INFN (Italy) and STFC (UK), the Swedish Research Council (Vetenskapsrådet, VR 2010-147, 2011-5253, and 2016-3969), BMBF NuSTAR-AGATA 05P18RDFN9 and BMBF NuSTAR 05P18RDFN1. The project was co-funded by the European Commission under the 7th Framework Program for RTD (2007-2013) under the Capacities Program (Contract Number 262010, ENSAR). This work was par-tially supported by the Ministry of Science, and Generalitat Valenciana, Spain, under the Grants SEV-2014-0398, FPA2017-84756-C4, PROMETEO/2019/005 and by the EU FEDER funds.
Published: 2020

19. Pairing-quadrupole interplay in the neutron-deficient tin nuclei: First lifetime measurements of low-lying states in 106,108Sn

Author: R. M. Perez-Vidal, T. Marchi, P. Reiter, Georgi P. Georgiev, Andrés P. Zuker, C. Fransen, D. Mengoni, J. Dudouet, Bo Cederwall, C. Theisen, C. Domingo-Pardo, Thomas Braunroth, A. Goasduff, O. Stezowski, W. Korten, F. C. L. Crespi, A. J. Boston, Johan Nyberg, C. Michelagnoli, B. Birkenbach, Vicente González, C. Müller-Gatermann, Tea Mijatović, D. Bazzacco, Hui Li, Enrique Sanchis, D. S. Judson, N. Cieplicka-Oryńczak, B. Million, Diego Barrientos, S. Leoni, M. Labiche, L. J. Harkness-Brennan, A. Jungclaus, F. Recchia, D. Testov, F.J. Egea-Canet, Herbert Hess, J. Eberth, H. C. Boston, A. Lefevre, J. Collado, István Kuti, A. Lemasson, Dóra Sohler, Alberto Pullia, M. D. Salsac, M. Siciliano, A. Gadea, D. R. Napoli, G. Jaworski, A. Lopez-Martens, S. Szilner, G. Benzoni, Maria Doncel, Eric Clément, M. Palacz, P. R. John, M. Zielińska, P. Désesquelles, B. Sayği, Ulrika Jakobsson, J. J. Valiente-Dobón, A. Maj, R. Menegazzo, S. Erturk, F. Nowacki, D. M. Cullen, A. Goldkuhle, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ege Üniversitesi, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Nuclear and High Energy Physics, Light Sn, chemistry.chemical_element, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, 01 natural sciences, Subatomär fysik, Lifetime, Multi-nucleon transfer, Nuclear structure, Tracking array, 0103 physical sciences, Subatomic Physics, Neutron, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Spectrometer, Isotope, 010308 nuclear & particles physics, lcsh:QC1-999, chemistry, Pairing, Excited state, Quadrupole, AGATA, Atomic physics, Tin, lcsh:Physics
Abstract: The lifetimes of the low-lying excited states 2(+) and 4(+) have been directly measured in the neutron-deficient Sn-106,Sn-108 isotopes. the nuclei were populated via a deep-inelastic reaction and the lifetime measurement was performed employing a differential plunger device. the emitted gamma rays were detected by the AGATA array, while the reaction products were uniquely identified by the VAMOS++ magnetic spectrometer. Large-Scale Shell-Model calculations with realistic forces indicate that, independently of the pairing content of the interaction, the quadrupole force is dominant in the B(E2; 2(1)(+) -> 0(g.s)(+)) values and it describes well the experimental pattern for Sn104-114 ; the B(E2;(+)(4) -> 2(1)(+)) values, measured here for the first time, depend critically on a delicate pairing-quadrupole balance, disclosed by the very precise results in Sn-108. (C) 2020 the Authors. Published by Elsevier B.V., European Union's Seventh Framework Programme for Research and Technological DevelopmentEuropean Union (EU) [262010]; Fondazione Cassa di Risparmio Padova e Rovigo under the project CONPHYT, starting grant in 2017; Swedish Research CouncilSwedish Research Council [822-2005-3332, 821-2010-6024, 821-2013-2304, 621-20145558, 2017-0065]; Knut and Alice Wallenberg FoundationKnut & Alice Wallenberg Foundation [2005.0184]; Scientific and Technological Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [114F473]; Ministerio de Ciencia e InnovacionInstituto de Salud Carlos IIISpanish Government [SEV-2014-0398, FPA2017-84756-C4, EEBBI-15-09671]; Generalitat ValencianaGeneralitat Valenciana [PROMETEO/2019/005]; EU-FEDER fundsEuropean Union (EU); Croatian Science Foundation [7194]; Hungarian National Research and Innovation Office (NKFIH) [K128947, PD124717, GINOP-2.3.3-15-2016-00034]; Polish National Science Centre under the COPIN-IN2P3 project [2014-14-M-ST2-00738, 2016-22M-ST2-00269, 2017-25-B-ST2-01569]; Polish National Science Centre under the COPIGAL project [2014-14-M-ST2-00738, 2016-22M-ST2-00269, 2017-25-B-ST2-01569]; Polish National Science Centre under the POLITA project [2014-14-M-ST2-00738, 2016-22M-ST2-00269, 2017-25-B-ST2-01569], The authors would like to thank the AGATA and VAMOS collaborations. Special thanks go to the GANIL technical staff for their help in setting up the apparatuses and the good quality beam and to A. Poves for his fruitful comments. This work was partially supported by the European Union's Seventh Framework Programme for Research and Technological Development (grant no. 262010). A.G. acknowledges the support of the Fondazione Cassa di Risparmio Padova e Rovigo under the project CONPHYT, starting grant in 2017. the work was also supported (B.C, H.L., J.N. and U.J.) by Swedish Research Council under the grant agreements nos. 822-2005-3332, 821-2010-6024, 821-2013-2304, 621-20145558 and 2017-0065, and by the Knut and Alice Wallenberg Foundation grant no. 2005.0184, (B.S.) by the Scientific and Technological Council of Turkey (TUBITAK) under the project no. 114F473, (A.G., A.J. and R.P.) by the Ministerio de Ciencia e Innovacion under the contracts nos. SEV-2014-0398, FPA2017-84756-C4 and EEBBI-15-09671, by the Generalitat Valenciana under the grant agreement no. PROMETEO/2019/005 and by the EU-FEDER funds, (T.M and S.S.) by the Croatian Science Foundation under the project no. 7194, (I.K and D.S.) by the Hungarian National Research and Innovation Office (NKFIH) under the project nos. K128947, PD124717 and GINOP-2.3.3-15-2016-00034, (M.P.) by the Polish National Science Centre with the grants nos. 2014-14-M-ST2-00738, 2016-22M-ST2-00269 and 2017-25-B-ST2-01569 under the COPIN-IN2P3, COPIGAL and POLITA projects.
Published: 2020

20. Lifetime measurements using a plunger device and the EUCLIDES Si array at the GALILEO $\gamma$-ray spectrometer

Author: S. Bakes, S. M. Lenzi, P. R. John, Yu. G. Sobolev, Suzana Szilner, G. Pasqualato, J. J. Valiente-Dobón, A. Gozzelino, F. Galtarossa, H. Liu, D. Testov, C. Müller-Gatermann, M. Rocchini, J. Bradbury, F. Recchia, G. Jaworski, K. Hadyńska-Klȩk, D. R. Napoli, M. Doncel, S. Riccetto, B. Saygi, A. Mentana, J. A. Dueñas, A. Goasduff, G. de Angelis, D. Bazzacco, A. Boso, F. Didierjean, P. Čolović, Bo Cederwall, R. Menegazzo, S. Lunardi, M. Siciliano, C. Boiano, Magda Cicerchia, D. Mengoni, G. Colucci, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Ege Üniversitesi
Subjects: Nuclear and High Energy Physics, Lifetime measurements, 01 natural sciences, 7. Clean energy, Nuclear physics, symbols.namesake, Recoil, 0103 physical sciences, 010306 general physics, Instrumentation, Physics, [PHYS]Physics [physics], gamma-ray spectroscopy gamma-ray spectrometer, Range (particle radiation), Plunger, Spectrometer, 010308 nuclear & particles physics, γ-ray spectroscopy γ-ray spectrometer, Detector, Si-array, ?-ray spectroscopy ?-ray spectrometer, Picosecond, Excited state, symbols, Galileo (vibration training), Doppler effect
Abstract: The GALILEO ?-ray spectrometer, installed at the Laboratori Nazionali di Legnaro (LNL), benefits from intense stable beams provided by the Tandem-ALPI-PIAVE accelerator complex and from radioactive beams to be delivered in the near future by the SPES facility. The spectrometer is complemented with a variety of ancillary devices to allow for nuclear structure and reaction studies. The 4? Si-ball array EUCLIDES coupled to the GALILEO ?-ray spectrometer represents one of the commonly used setup for experiments aiming at spectroscopic studies. High-efficiency detection of light-charged particles in a fusion–evaporation reaction guarantees good discrimination of different reaction channels and provides essential information for the kinematic reconstruction. In this paper we discuss a configuration of the EUCLIDES array developed for the lifetime measurements of nuclear excited states populated in a fusion–evaporation reaction. In such a configuration a part of the EUCLIDES detectors is disassembled allowing for the installation of a plunger device in the reaction chamber. The reduced configuration of EUCLIDES provides high detection efficiency necessary for reliable light charged-particle discrimination. We report on the commissioning experiment focused on the 58Ni(58Ni,3p)113I reaction. The lifetimes of 11/2? and 15/2? states were measured by applying the Recoil Distance Doppler Shift method to be equal to 206(20) ps and 7.9(12) ps correspondingly and were in good agreement with the values cited in the literature. Thus, the combination of the GALILEO and EUCLIDES arrays, and the plunger device has resulted in a powerful experimental setup to determine lifetimes of excited states in neutron-deficient nuclei in the picosecond range. © 2020 Elsevier B.V., Fondazione Cassa di Risparmio di Padova e Rovigo Narodowe Centrum Nauki, NCN: 2017/25/B/ST2/01569 Narodowym Centrum Nauki, NCN, The authors would like to thank the technical staff of the LNL-INFN facility for their assistance in providing excellent operation of the XTU-Tandem accelerator. The authors wish to acknowledge the support of local engineers P. Cocconi and R. Isocrate. The work of G. Jaworski was supported by the National Science Centre, Poland (NCN) (grant no. 2017/25/B/ST2/01569 ). A. Goasduff acknowledges the support of the CARIPARO foundation under the Starting Grant 2017 .
Published: 2020

21. Enhanced collectivity in 12Be

Author: Timothy Johnson, Alexandra Gade, E. A. McCutchan, D. Weisshaar, C. Morse, Alejandro Sonzogni, E. Merchan, C. Loelius, S. Beceiro Novo, V.S. Prasher, K. Whitmore, F. Recchia, D. Bazin, E. Lunderberg, V. M. Bader, P. Chowdhury, C. J. Lister, and H. Iwasaki
Subjects: Physics, Quenching, Collectivity, Lifetimes, Nuclear transition probabilities, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Attenuation, Shell (structure), Inelastic scattering, 01 natural sciences, lcsh:QC1-999, symbols.namesake, Excited state, 0103 physical sciences, Quadrupole, symbols, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Doppler effect, lcsh:Physics
Abstract: Electromagnetic quadrupole transition strength is a sensitive probe of the evolution of the structure of nuclei, particularly the competition between collectivity and magicity. We have performed a new lifetime measurement of the 2 1 + state of 12Be to study the interplay of these phenomena. The lifetime was measured with the Doppler Shift Attenuation Method using the γ-ray detector GRETINA. Excited states of 12Be were produced via inelastic scattering at 55 MeV/nucleon, using several different targets to control for systematic uncertainties in the stopping powers. The lifetime is determined to be τ = 1.38 ± 0.10 (stat) ± 0.19 (sys) ps, which is about half the previously reported value at twice the precision. The reduced transition strength deduced from this result is B ( E 2 ; 2 1 + → 0 1 + ) = 14.2 ± 1.0 (stat) ± 2.0 (sys) e 2 fm 4 , which supports the quenching of the N = 8 shell gap in 12Be.
Published: 2018

22. Measurement of key resonance states for the P30(p,γ)S31 reaction rate, and the production of intermediate-mass elements in nova explosions

Author: Filomena Nunes, J. Stevens, R. Stroberg, V. M. Bader, P. J. Woods, Shumpei Noji, F. Recchia, C. Langer, A. Estrade, J. Browne, Zach Meisel, T.R. Baugher, Kathrin Wimmer, T. Poxon-Pearson, Daniel Bazin, Hendrik Schatz, B. A. Brown, Alexandra Gade, D. Seweryniak, Gavin Lotay, Remco Zegers, G. Perdikakis, M. Scott, Antonios Kontos, T. Redpath, Anu Kankainen, D. T. Doherty, J. Pereira, D. Weisshaar, Jordi José, and Fernando Montes
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Presolar grains, 01 natural sciences, Nuclear physics, Reaction rate, symbols.namesake, Nucleosynthesis, 0103 physical sciences, symbols, Astrophysics::Solar and Stellar Astrophysics, Atomic physics, 010306 general physics, Hamiltonian (quantum mechanics), Ejecta, Order of magnitude
Abstract: We report the first experimental constraints on spectroscopic factors and strengths of key resonances in the 30P(p, γ)31Sreaction critical for determining the production of intermediate-mass elements up to Ca in nova ejecta. The 30P(d, n)31Sreaction was studied in inverse kinematics using the GRETINA γ-ray array to measure the angle-integrated cross-sections of states above the proton threshold. In general, negative-parity states are found to be most strongly produced but the absolute values of spectroscopic factors are typically an order of magnitude lower than predicted by the shell-model calculations employing WBP Hamiltonian for the negative-parity states. The results clearly indicate the dominance of a single 3/2−resonance state at 196 keV in the region of nova burning T≈0.10–0.17GK, well within the region of interest for nova nucleosynthesis. Hydrodynamic simulations of nova explosions have been performed to demonstrate the effect on the composition of nova ejecta.
Published: 2017

23. Evidence of octupole-phonons at high spin in 207Pb

Author: B. Quintana Arnés, G. Bocchi, R. Perez, Raymond J. Carroll, W. Korten, Alberto Pullia, M. Labiche, Zs. Podolyák, A. Navin, Enrique Sanchis, F. Saillant, Norbert Pietralla, F. C. L. Crespi, C. M. Shand, E. Dupont, B. Fornal, D. Kocheva, Diego Barrientos, O. Stezowski, P. Reiter, L. Atanasova, M. Ciemala, Herbert Hess, Roberto Menegazzo, D. Mengoni, B. Birkenbach, J. Collado, H.J. Eberth, Bo Cederwall, D. Ralet, B. Million, A. Maj, P. Van Isacker, D. Wilmsen, J. J. Valiente Dobon, J. Dudouet, F. Recchia, P. Bednarczyk, M. Rejmund, Georgi P. Georgiev, Andrew Stuchbery, A. Goasduff, A. Lemasson, Deyan Yordanov, P. R. John, Salsac, R. L. Lozeva, A. Jungclaus, C. Michelagnoli, A. Blazhev, J. Goupil, S. Franchoo, A. Gadea, L. J. Harkness, Johan Nyberg, S. M. Lenzi, D. L. Balabanski, D. M. Cullen, I. Burrows, T. Konstantinopoulos, Emyr Clement, H. C. Boston, O. Wieland, C. Theisen, A. J. Boston, A. Kusoglu, C. Fransen, A. Korichi, S. Leoni, C. Müller-Gatermann, J. Ljungvall, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Plunger device, Phonon, Nuclear Theory, Octupole phonon, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], gamma-Ray tracking, γ -Ray tracking, 01 natural sciences, 7. Clean energy, Recoil, VAMOS++ spectrometer, AGATA spectrometer, Nuclear deformation, γ-Ray tracking, 0103 physical sciences, Physics::Atomic Physics, Nuclear Experiment, 010306 general physics, Spin (physics), Physics, VAMOS plus plus spectrometer, 010308 nuclear & particles physics, lcsh:QC1-999, Atomic physics, lcsh:Physics
Abstract: A lifetime measurement of the 19/2 state in Pb has been performed using the Recoil Distance Doppler-Shift (RDDS) method. The nuclei of interest were produced in multi-nucleon transfer reactions induced by a Pb beam impinging on a Mo enriched target. The beam-like nuclei were detected and identified in terms of their atomic mass number in the VAMOS++ spectrometer while the prompt γ rays were detected by the AGATA tracking array. The measured large reduced transition probability B(E3,19/2→13/2)=40(8) W.u. is the first indication of the octupole phonon at high spin in Pb. An analysis in terms of a particle-octupole-vibration coupling model indicates that the measured B(E3) value in Pb is compatible with the contributions from single-phonon and single particle E3 as well as E3 strength arising from the double-octupole-phonon 6 state, all adding coherently. A crucial aspect of the coupling model, namely the strong mixing between single-hole and the phonon-hole states, is confirmed in a realistic shell-model calculation.
Published: 2019

24. The $4\pi$4π highly-efficient light-charged-particle detector EUCLIDES, installed at the GALILEO array for in-beam $\gamma$γ-ray spectroscopy

Author: L. Grassi, A. Gadea, G. de Angelis, Roberto Menegazzo, D. Mengoni, P. Cocconi, M. Siciliano, A. Goasduff, J. J. Valiente-Dobón, D. Bazzacco, D. Testov, A. Boso, S. Lunardi, P. R. John, D. R. Napoli, Roberto Isocrate, G. Jaworski, K. Hadynska-Klek, F. J. Egea Canet, F. Recchia, C. Boiano, and J. A. Dueñas
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Detector, 01 natural sciences, Charged particle, Particle detector, Semiconductor detector, Nuclear physics, 0103 physical sciences, Neutron, Gamma spectroscopy, Nuclear Experiment, 010306 general physics
Abstract: In a fusion-evaporation reaction, nuclei are produced by evaporating light-charged particles and neutrons from the compound nucleus. Typically, a nucleus of interest is produced as a result of a part of the total cross-section and, in order to guarantee a good channel discrimination, a particle detector, like the EUCLIDES $4\pi$ Si-ball array, is necessary. EUCLIDES has been quoted in more than a hundred publications resulting from many experiments performed in combination with the EUROBALL and GASP $\gamma$-ray spectrometers. The present paper reports on the upgraded version of EUCLIDES, that is presently coupled to the new GALILEO $\gamma$-ray spectrometer, installed at the Laboratori Nazionali di Legnaro, INFN. The design, characteristics and performance of the EUCLIDES array are presented and discussed.
Published: 2019

25. First spectroscopy of 61Ti and the transition to the Island of Inversion at N = 40

Author: Kathrin Wimmer, M. A. M. AlAqeel, C. R. Nita, D. Kahl, V. Werner, S. Bae, F. Nowacki, Satoru Momiyama, Toshiaki Ando, S. M. Lenzi, L. J. Harkness-Brennan, I. Kojouharov, Megumi Niikura, S. Riccetto, P. A. Söderström, Hiroyoshi Sakurai, Toshiyuki Sumikama, Shin-Ichiro Nishimura, K. Matsui, Philip Woods, G. G. Kiss, P. Schrock, H. Baba, T. Isobe, D. R. Napoli, Y. Saito, M. Labiche, H. Schaffner, J. Ha, W. Witt, S. Choi, P. R. John, Thomas Davinson, V. H. Phong, O. Aktas, Alfredo Poves, C. J. Griffin, C. Stahl, P. Doornenbal, F. Recchia, N. Kurz, A. Estrade, UAM. Departamento de Física Teórica, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, SHELL model, FOS: Physical sciences, Shell evolution, Island of Inversion, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, 0103 physical sciences, Gamma spectroscopy, Gamma-ray spectroscopy, Nuclear Experiment (nucl-ex), 010306 general physics, Spectroscopy, Nuclear Experiment, Projectile fragmentation, Physics, Spins, 010308 nuclear & particles physics, Island of inversion, Isomeric decay, Física, lcsh:QC1-999, Radioactive beams, Atomic physics, Ground state, Beam (structure), lcsh:Physics
Abstract: Isomeric states in 59,61Ti have been populated in the projectile fragmentation of a 345 AMeV 238U beam at the Radioactive Isotope Beam Factory. The decay lifetimes and delayed gamma-ray transitions were measured with the EURICA array. Besides the known isomeric state in 59Ti, two isomeric states in 61Ti are observed for the first time. Based on the measured lifetimes, transition multipolarities as well as tentative spins and parities are assigned. Large-scale shell model calculations based on the modified LNPS interaction show that both 59Ti and 61Ti belong to the Island of Inversion at N=40 with ground state configurations dominated by particle-hole excitations to the g_9/2 and d_5/2 orbits., Phys. Lett. B accepted
Published: 2019

26. Low-lying states of $^{92,93}$Nb excited in the reactions induced by the weakly-bound nucleus $^6$Li near the Coulomb barrier

Author: D. Mengoni, Ying-Jun Ma, Yunzuo Liu, Shi-Peng Hu, Cheng-Qian Li, Wu Yiheng, Gao-Long Zhang, A. Goasduff, F. Galtarossa, G. X. Zhang, H. B. Sun, D. Bazzacco, Guan-Jian Fu, Yi-Feng Lv, D. Testov, Cenxi Yuan, Jingbin Lu, P. R. John, Huan-Qiao Zhang, Zhen Huang, Ke-Yan Ma, Ming-Li Wang, F. Recchia, M. Siciliano, J. J. Valiente-Dobon, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Subjects: Nuclear and High Energy Physics, coincidence measurement, level structure, odd-A nucleus, 93, Nb, odd-odd nucleus, 92, weakly-bound projectile, SHELL model, Coulomb barrier, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, 0103 physical sciences, medicine, Incident energy, 010306 general physics, Instrumentation, Physics, 010308 nuclear & particles physics, Gamma ray, Astronomy and Astrophysics, Charged particle, medicine.anatomical_structure, Excited state, Level structure, Atomic physics, Nucleus
Abstract: Excited states of odd-odd nucleus 92Nb and odd-A nucleus 93Nb were populated in the 6Li+ 89Y reaction with an incident energy of 34 MeV. The processes that produce 92,93Nb and can be measured by a combination of light charged particle and gamma ray measurements are discussed. Twenty new transitions are observed and eight new levels are constructed in 92Nb, and in addition two new transitions are added to the level scheme of 93Nb. Using shell model calculations, the low-lying structure of 92Nb is investigated and compared with the experimental results.
Published: 2019

27. Study of medium-spin states of neutron-rich 87, 89, 91Rb isotopes

Author: S. M. Lenzi, A. M. Stefanini, S. J. Freeman, E. Sahin, Baharak Hadinia, P. T. Wady, David O'Donnell, J. F. Smith, C. A. Ur, G. de Angelis, G. Montagnoli, R. Orlandi, Suzana Szilner, M. Labiche, G. S. Simpson, A. Hodsdon, J. Ollier, T. Martinez, Z. M. Wang, A. G. Smith, E. Fioretto, Fernando Scarlassara, D. R. Napoli, V. Kumar, S. Lunardi, G. A. Jones, S. Beghini, M. Axiotis, F. Haas, J. J. Valiente-Dobón, N. Marginean, D. Bazzacco, G. Pollarolo, D. A. Torres, L. Corradi, X. Liang, N. J. Thompson, B. G. Carlsson, Morten Hjorth-Jensen, A. Gadea, D. Mengoni, T. Faul, K. M. Spohr, Th. Kröll, E. Farnea, F. Recchia, R. Mărginean, R. Chapman, F. D. Vedova, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)
Subjects: Physics, Nuclear and High Energy Physics, Spin states, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, Yrast, Nuclear Theory, Context (language use), 01 natural sciences, Isotopes of rubidium, Nuclear physics, Excited state, 0103 physical sciences, nuclear structure, Rb isotopes, Physics::Accelerator Physics, Nuclear fusion, Neutron, Nuclear Experiment, 010306 general physics, ydinfysiikka
Abstract: International audience; Excited states of the rubidium isotopes$_{37}^{87, 89, 91}$Rb have been studied at the INFN Legnaro National Laboratory. Measurements of the $\gamma$ -ray decay of fragments produced in binary grazing reactions resulting from the interaction of a beam of 530 MeV$^{96}$Zr ions with a$^{124}$Sn target have been complemented by studies of the $\gamma$ -ray decay of fission fragments produced in the interaction of a beam of 230 MeV$^{36}$S ions with a thick$^{176}$Yb target. The structure of the yrast states of$_{37}^{87, 89, 91}$Rb has been discussed within the context of spherical shell-model and cranked Nilsson-Strutinsky calculations.
Published: 2019

28. Diversity of shapes and rotations in the $\gamma$-soft $^{130}$Ba nucleus: First observation of a $t$-band in the $A=130$ mass region

Author: Song Guo, Miao Liu, B. F. Lv, A. Boso, D. Mengoni, Q. B. Chen, István Kuti, E. A. Lawrie, D. R. Napoli, Corina Andreoiu, K. K. Zheng, Torbjörn Bäck, J. J. Valiente-Dobón, M. Siciliano, K. Ortner, Y. H. Qiang, F. Galtarossa, G. Jaworski, J. Srebrny, S. Frauendorf, S. Riccetto, K. Whitmore, Xiaojuan Zhou, Jie Wang, E. Dupont, D. Bazzacco, T. Marchlewski, F. H. Garcia, D. Testov, Dóra Sohler, A. Astier, Y. X. Liu, János Timár, F. Recchia, A. Tucholski, Philip M Walker, Ramon Wyss, A. Goasduff, Bo Cederwall, C. M. Petrache, R. Li, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Subjects: Nuclear and High Energy Physics, Projected shell model, Proton, Nuclear Theory, FOS: Physical sciences, Collective rotations, Nuclear structure, Particle rotor model, Shape coexistence, Tiltid axis cranking, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Rotation, 01 natural sciences, Molecular physics, Nuclear Theory (nucl-th), 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Spin-½, Physics, Spins, 010308 nuclear & particles physics, lcsh:QC1-999, Dipole, Quasiparticle, lcsh:Physics
Abstract: Several new bands have been identified in 130Ba, among which there is one with band-head spin 8+. Its properties are in agreement with the Fermi-aligned \nu h11/2^2 , 7/2+[523] \otimes 9/2-[514] Nilsson configuration. This is the first observation of a two-quasiparticle t-band in the A=130 mass region. The t-band is fed by a dipole band involving two additional h11/2 protons. The odd-spin partners of the proton and neutron S-bands and the ground-state band at high spins are also newly identified. The observed bands are discussed using several theoretical models, which strongly suggest the coexistence of prolate and oblate shapes polarized by rotation aligned two-proton and two-neutron configurations, as well as prolate collective rotations around axes with different orientations. With the new results, 130Ba presents one of the best and most complete sets of collective excitations that a gamma-soft nucleus can manifest at medium and high spins, revealing a diversity of shapes and rotations for the nuclei in the A = 130 mass region., Comment: 8 pages, 7 figures
Published: 2019

29. A new dedicated plunger device for the GALILEO γ-ray detector array

Author: J. Litzinger, A. Goasduff, J. J. Valiente-Dobón, J. Jolie, A. Goldkuhle, F. von Spee, D. Mengoni, G. de Angelis, P. Cocconi, M. Beckers, G. Jawroski, Alfred Dewald, S. Thiel, K. Hadynska-Klek, A. Boso, F. Recchia, A. Gottardo, D. R. Napoli, K. O. Zell, P. R. John, Thomas Braunroth, C. Müller-Gatermann, D. Bazzacco, S. M. Lenzi, C. Fransen, M. Siciliano, R. Menegazzo, D. Testov, and A. Gozzelino
Subjects: Physics, Plunger, Range (particle radiation), Nuclear and High Energy Physics, 010308 nuclear & particles physics, business.industry, Detector, Measure (physics), Lifetimes, 01 natural sciences, Recoil, Optics, Excited state, 0103 physical sciences, 180Pt, Recoil distance Doppler-shift method, Instrumentation, Galileo (vibration training), 010306 general physics, business, Beam (structure)
Abstract: A new device, the GALILEO plunger, has been developed for lifetime measurement studies using the GALILEO γ -ray detector array at the Laboratori Nazionali di Legnaro (LNL) in Legnaro, Italy. This plunger device holds two stretched metal foils in the beam path for the use of the recoil distance Doppler-shift technique in order to measure lifetimes of nuclear excited states in the range of 1 ps to 1 ns. The compact design allows one to combine different auxiliary detectors with the plunger device inside the target chamber and takes care of high γ -ray transparency. The design and control of the device are presented in this paper, together with lifetimes of excited states in 180Pt measured within the first in-beam commissioning run.
Published: 2019

30. Performance of the Fully Digital FPGA-Based Front-End Electronics for the GALILEO Array

Author: C. A. Ur, Diego Barrientos, D. Bortolato, D. Bazzacco, P. Cocconi, D. Mengoni, M. Bellato, Enrique Sanchis, M. Gulmini, R. Isocrate, D. Rosso, Vicente González, F. Recchia, Jose Javier Valiente-Dobón, Alberto Pullia, A. Gadea, and N. Toniolo
Subjects: Digital electronics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Preamplifier, business.industry, Computer science, Detector, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Energy and Engineering, Control system, AGATA, Electronics, Nuclear Experiment (nucl-ex), Electrical and Electronic Engineering, Galileo (vibration training), business, Field-programmable gate array, Nuclear Experiment, Computer hardware
Abstract: In this work we present the architecture and results of a fully digital Front End Electronics (FEE) read out system developed for the GALILEO array. The FEE system, developed in collaboration with the Advanced Gamma Tracking Array (AGATA) collaboration, is composed of three main blocks: preamplifiers, digitizers and preprocessing electronics. The slow control system contains a custom Linux driver, a dynamic library and a server implementing network services. The digital processing of the data from the GALILEO germanium detectors has demonstrated the capability to achieve an energy resolution of 1.53 per mil at an energy of 1.33 MeV., Comment: 5 pages, 6 figures, preprint version of IEEE Transactions on Nuclear Science paper submitted for the 19th IEEE Real Time Conference
Published: 2015

31. M1 and E2 transition rates from core-excited states in semi-magic 94Ru

Author: V. Modamio, F. Ghazi Moradi, Ulrika Jakobsson, Bo Cederwall, Torbjörn Bäck, H. W. Li, J. J. Valiente-Dobón, M. Siciliano, S. Erturk, István Kuti, Chong Qi, Eiji Ideguchi, D. R. Napoli, C. Michelagnoli, S. S. Ghugre, A. Gottardo, R. Wadsworth, János Timár, R. Raut, Zs. Dombradi, M. Doncel, A. Algora, A. Boso, G. Jaworski, G. de Angelis, P. J. Davies, Zhigang Xiao, D. M. Debenham, H. Al Azri, C. M. Petrache, A. Atac, Eric Clément, Baki Akkuş, F. Recchia, Mikael Sandzelius, A. Gadea, T. Hüyük, A. Ertoprak, M. Palacz, Johan Nyberg, B. M. Nyakó, Ertoprak, A., Department of Physics, Royal Institute of Technology (KTH), Stockholm, SE-10691, Sweden, Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, Istanbul, 34134, Turkey -- Cederwall, B., Department of Physics, Royal Institute of Technology (KTH), Stockholm, SE-10691, Sweden -- Qi, C., Department of Physics, Royal Institute of Technology (KTH), Stockholm, SE-10691, Sweden -- Doncel, M., Department of Physics, Royal Institute of Technology (KTH), Stockholm, SE-10691, Sweden, Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Jakobsson, U., Department of Physics, Royal Institute of Technology (KTH), Stockholm, SE-10691, Sweden, Department of Chemistry, University of Helsinki, P.O. Box 3, Helsinki, 00014, Finland -- Nyakó, B.M., MTA Atomki, Debrecen, H-4001, Hungary -- Jaworski, G., Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro, I-35020, Italy -- Davies, P., Department of Physics, University of York, Heslington, York, YO10 5DD, United Kingdom -- de France, G., Grand Accélérateur National d’Ions Lourds (GANIL), CEA/DSM - CNRS/IN2P3, Bd Henri Becquerel, BP 55027, Caen Cedex 5, F-14076, France -- Kuti, I., MTA Atomki, Debrecen, H-4001, Hungary -- Napoli, D.R., Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro, I-35020, Italy -- Wadsworth, R., Department of Physics, University of York, Heslington, York, YO10 5DD, United Kingdom -- Ghugre, S.S., UGC-DAE Consortium for Scientific Research, Kolkata Centre, Kolkata, 700098, India -- Raut, R., UGC-DAE Consortium for Scientific Research, Kolkata Centre, Kolkata, 700098, India -- Akkus, B., Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, Istanbul, 34134, Turkey -- Al Azri, H., Department of Physics, University of York, Heslington, York, YO10 5DD, United Kingdom -- Algora, A., MTA Atomki, Debrecen, H-4001, Hungary, Instituto de Física Corpuscular, CSIC-Universidad de Valencia, Valencia, E-46980, Spain -- de Angelis, G., Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro, I-35020, Italy -- Atac, A., Department of Physics, Royal Institute of Technology (KTH), Stockholm, SE-10691, Sweden -- Bäck, T., Department of Physics, Royal Institute of Technology (KTH), Stockholm, SE-10691, Sweden -- Boso, A., Dipartimento di Fisica e Astronomia, Università di Padova, Padova, Italy -- Clément, E., Grand Accélérateur National d’Ions Lourds (GANIL), CEA/DSM - CNRS/IN2P3, Bd Henri Becquerel, BP 55027, Caen Cedex 5, F-14076, France -- Debenham, D.M., Department of Physics, University of York, Heslington, York, YO10 5DD, United Kingdom -- Dombrádi, Z., MTA Atomki, Debrecen, H-4001, Hungary -- Ertürk, S., Nigde Omer Halisdemir University, Science and Art Faculty, Department of Physics, Nigde, 51200, Turkey -- Gadea, A., Instituto de Física Corpuscular, CSIC-Universidad de Valencia, Valencia, E-46980, Spain -- Ghazi Moradi, F., Department of Physics, Royal Institute of Technology (KTH), Stockholm, SE-10691, Sweden -- Gottardo, A., Centre de Sciences Nucléaires et Sciences de la Matière, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91405, France -- Hüyük, T., Instituto de Física Corpuscular, CSIC-Universidad de Valencia, Valencia, E-46980, Spain -- Ideguchi, E., Research Center for Nuclear Physics, Osaka University, Osaka, Japan -- Li, H., Department of Physics, Royal Institute of Technology (KTH), Stockholm, SE-10691, Sweden -- Michelagnoli, C., Grand Accélérateur National d’Ions Lourds (GANIL), CEA/DSM - CNRS/IN2P3, Bd Henri Becquerel, BP 55027, Caen Cedex 5, F-14076, France -- Modamio, V., Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro, I-35020, Italy -- Nyberg, J., Department of Physics and Astronomy, Uppsala University, Uppsala, SE-75120, Sweden -- Palacz, M., Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, Warsaw, PL 02-093, Poland -- Petrache, C.M., Centre de Sciences Nucléaires et Sciences de la Matière, CNRS/IN2P3, Université Paris-Saclay, Orsay, 91405, France -- Recchia, F., Dipartimento di Fisica e Astronomia, Università di Padova, Padova, Italy -- Sandzelius, M., University of Jyväskylä, Department of Physics, Jyväskylä, FI-40014, Finland -- Siciliano, M., Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro, I-35020, Italy -- Timár, J., MTA Atomki, Debrecen, H-4001, Hungary -- Valiente-Dobón, J.J., Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro, I-35020, Italy -- Xiao, Z.G., Department of Physics, Tsinghua University, Beijing, 100084, China, 0-Belirlenecek, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Angular momentum, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Hadron, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Spectral line, 0-Belirlenecek, Baryon, Excited state, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon
Abstract: Lifetimes of high-spin states have been measured in the semi-magic (N= 50) nucleus 94Ru. Excited states in 94Ru were populated in the 58Ni(40Ca, 4p)94Ru* fusion-evaporation reaction at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator complex. DSAM lifetime analysis was performed on the Doppler broadened line shapes in energy spectra obtained from ?-rays emitted while the residual nuclei were slowing down in a thick 6mg/cm^2 metallic 58Ni target. In total eight excited-state lifetimes in the angular momentum range I= (13 - 20) ? have been measured, five of which were determined for the first time. The corresponding B(M1) and B(E2) reduced transition strengths are discussed within the framework of large-scale shell model calculations to study the contribution of different particle-hole configurations, in particular for analyzing contributions from core-excited configurations. © 2018, SIF, Springer-Verlag GmbH Germany, part of Springer Nature., National Brain Research Centre Vetenskapsrådet Göran Gustafssons Stiftelse för Naturvetenskaplig och Medicinsk Forskning Firat University Scientific Research Projects Management Unit Ministerio de Economía y Competitividad Science and Technology Facilities Council, We thank the operators of the GANIL cyclotrons for providing the beam, their cooperation and technical support. We would also like to thank the EXOGAM, DIAMANT and Neutron Wall Collaborations. This work was supported by the Swedish Research Council under Grant Nos. 621-2014-5558, 621-2012-3805, and 621-2013-4323 and the Göran Gustafsson foundation, the Scientific Research Projects Coordination Unit of Istanbul University Project No. 47886 and 48101, the UK STFC under grant number ST/L005727/1, the Spanish Ministerio de Economía y Competitividad under grant FPA2014-52823-C2-1-P and the program Severo Ochoa (SEV-2014-0398), the Polish National Research Centre contracts no. 2013/08/M/ST2 /00257 (LEA COPIGAL) and 2016/22/M/ST2/00269, the Scientific and Technological Council of Turkey (Proj. no. 114F473). BMN, IK, ZD and JT acknowledge the financial support of GINOP-2.3.3-15-2016-00034. IK was supported by National Research, Development and Innovation Office NK-FIH, contract number PD 124717. The computations were performed on resources provided by the Swedish National Infrastructure for Computing (SNIC) at PDC, KTH, Stockholm.
Published: 2018

32. Towards the lowest-energy limit for light ions identification with silicon pixel-type detectors

Author: S. Brambilla, F. C. L. Crespi, B. Fornal, S. Capra, G. Bocchi, C. Boiano, G. Jaworski, N. Cieplicka-Oryńczak, M. Siciliano, M. Ciemala, K. Hadynska-Klek, J. J. Valiente-Dobón, D. Mengoni, D. Bazzacco, Ł. W. Iskra, P. R. John, J.A. Dueñas, G. Benzoni, Alain Goasduff, S. Leoni, F. Recchia, and D. Testov
Subjects: Physics, Nuclear and High Energy Physics, Silicon, 010308 nuclear & particles physics, Detector, chemistry.chemical_element, Alpha particle, Kinetic energy, 01 natural sciences, Particle identification, Ion, Nuclear physics, chemistry, 0103 physical sciences, Nuclear fusion, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: An in-beam test of two pixel-type silicon detectors of the TRACE detector project has been performed at Laboratori Nazionali di Legnaro (Italy). The aim was to investigate the lowest kinetic energy values at which isotopic identification of heavy-ion reactions products with mass $ A\sim 10$ is possible, by using a single-layer silicon detector. Two separate read-out chains, analog and digital, were used, and the Pulse Shape Analysis technique was employed to obtain the particle identification matrices for the digitally processed data. The results confirmed the high capability of the Pulse Shape Analysis method which can be used for light ion identification, with performances similar to the analog approach. Separation in both charge and mass was obtained for Li and Be isotopes, however, the presence of a significant background from alpha particles severely limited the data analysis in the lower energy region. Due to this effect, the identification of the light products (7, 6Li isotopes) could be possible down to $ \sim 24.5$ MeV only, while the 9, 7Be isotopes were separable down to $ \sim 29$ MeV. This gives the value of $ < 4$ MeV/nucleon as the lowest kinetic energy for light products identification by using the pixel-type detectors of the TRACE project, in the present experimental conditions.
Published: 2018

33. Lifetimes of excited states in triaxially deformed $^{107}$Tc and $^{109,111,113}$Rh

Author: Igor T. Čeliković, W. Rother, Jose Javier Valiente-Dobón, C. Louchart, Bertrand Jacquot, L. Grente, W. Korten, B. Sulignano, E. Sahin, C Theisen, A. Dijon, Emmanuel Clément, Andreas Görgen, Sunniva Siem, F. Recchia, C. Michelagnoli, M. D. Salsac, J. Ljungvall, O. Delaune, Thomas Braunroth, D. R. Napoli, B. Bruyneel, M. Hackstein, Trine Wiborg Hagen, F. Farget, Alfred Dewald, J. Litzinger, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, differential plunger, Spectrometer, 010308 nuclear & particles physics, Fission, Yrast, Hadron, Nuclear Theory, 100 region, fission fragments, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], high-spin structure, 7. Clean energy, 01 natural sciences, rotational bands, Excited state, 0103 physical sciences, Nuclear fusion, Atomic number, Atomic physics, 010306 general physics, Nuclear Experiment, Beam (structure)
Abstract: Lifetimes of excited states in 107Tc, 109Rh, 111Rh, and 113Rh were measured at GANIL using the Recoil-Distance Doppler Shift method. The neutron-rich nuclei were produced in fission reactions in inverse kinematics with a 238U beam impinging on a 9Be target. Fission fragments were identified event-by-event in the ray-tracing spectrometer VAMOS++ and correlated with prompt $\gamma$ rays observed around the target position with the EXOGAM Ge detector array. Several lifetimes were obtained for states in the positive-parity yrast bands in the four nuclei and compared to triaxial particle-rotor calculations. The results clarify the configuration for the strongest positive-parity band in 107Tc and suggest a gradual increase of triaxial deformation with atomic number Z, reaching almost maximum triaxiality for the neutron-rich Rh nuclei.
Published: 2018

34. Single-neutron orbits near 78 Ni: Spectroscopy of theN=49isotope 79 Zn

Author: V. Bildstein, Steven D. Pain, N. Warr, Joonas Konki, K. Nowak, F. Flavigny, T. Kröll, F.K. Wenander, A. Jungclaus, J. F. W. Lane, P. Van Duppen, R. Krücken, F. Nowacki, Kamila Sieja, Marc Huyse, A. Illana, M. von Schmid, Janne Pakarinen, T. Roger, Kathrin Wimmer, D. Mücher, H. De Witte, S. Bottoni, R. Chapman, Roman Gernhäuser, P. Reiter, F. Recchia, G. de Angelis, A. N. Andreyev, D. Voulot, J. Elseviers, J. J. Valiente Dobon, J. F. Smith, Thomas Elias Cocolios, R. Orlandi, Liam Gaffney, Riccardo Raabe, V. Liberati, A. Gottardo, J. G. Johansen, M. Seidlitz, E. Rapisarda, Jan Diriken, E. Sahin, B. A. Marsh, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)
Subjects: Nuclear reaction, Nuclear and High Energy Physics, Angular momentum, Proton, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, gamma-Ray transitions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Transfer reactions, 0103 physical sciences, Nuclear Physics - Experiment, Neutron, Nuclear structure, Nuclear Experiment, 010306 general physics, Spectroscopy, ComputingMilieux_MISCELLANEOUS, N=50 shell closure, [PHYS]Physics [physics], Physics, Elastic scattering, NUCLEI, RICH ISOTOPES, 010308 nuclear & particles physics, lcsh:QC1-999, ELASTIC-SCATTERING, Excited state, Atomic physics, γ-Ray transitions, Nucleon, lcsh:Physics
Abstract: Single-neutron states in the Z=30, N=49isotope 79Zn have been populated using the 78Zn(d,p)79Zn transfer reaction at REX-ISOLDE, CERN. The experimental setup allowed the combined detection of protons ejected in the reaction, and of γrays emitted by 79Zn. The analysis reveals that the lowest excited states populated in the reaction lie at approximately 1MeV of excitation, and involve neutron orbits above the N=50shell gap. From the analysis of γ-ray data and of proton angular distributions, characteristic of the amount of angular momentum transferred, a5/2+configuration was assigned to a state at 983keV. Comparison with large-scale-shell-model calculations supports a robust neutron N=50shell-closure for 78Ni. These data constitute an important step towards the understanding of the magicity of 78Ni and of the structure of nuclei in the region. publisher: Elsevier articletitle: Single-neutron orbits near 78Ni: Spectroscopy of the isotope 79Zn journaltitle: Physics Letters B articlelink: http://dx.doi.org/10.1016/j.physletb.2014.12.006 content_type: article copyright: Copyright © 2014 The Authors. Published by Elsevier B.V. ispartof: Physics Letters B vol:740 pages:298-302 status: published
Published: 2015

35. Conceptual design of the AGATA 1$\pi$ array at GANIL

Author: E. Clément, C. Michelagnoli, G. de France, H.J. Li, A. Lemasson, C. Barthe Dejean, M. Beuzard, P. Bougault, J. Cacitti, J.-L. Foucher, G. Fremont, P. Gangnant, J. Goupil, C. Houarner, M. Jean, A. Lefevre, L. Legeard, F. Legruel, C. Maugeais, L. Ménager, N. Ménard, H. Munoz, M. Ozille, B. Raine, J.A. Ropert, F. Saillant, C. Spitaels, M. Tripon, Ph. Vallerand, G. Voltolini, W. Korten, M.-D. Salsac, Ch. Theisen, M. Zielińska, T. Joannem, M. Karolak, M. Kebbiri, A. Lotode, R. Touzery, Ch. Walter, A. Korichi, J. Ljungvall, A. Lopez-Martens, D. Ralet, N. Dosme, X. Grave, N. Karkour, X. Lafay, E. Legay, I. Kojouharov, C. Domingo-Pardo, A. Gadea, R.M. Pérez-Vidal, J.V. Civera, B. Birkenbach, J. Eberth, H. Hess, L. Lewandowski, P. Reiter, A. Nannini, G. De Angelis, G. Jaworski, P. John, D.R. Napoli, J.J. Valiente-Dobón, D. Barrientos, D. Bortolato, G. Benzoni, A. Bracco, S. Brambilla, F. Camera, F.C.L. Crespi, S. Leoni, B. Million, A. Pullia, O. Wieland, D. Bazzacco, S.M. Lenzi, S. Lunardi, R. Menegazzo, D. Mengoni, F. Recchia, M. Bellato, R. Isocrate, F.J. Egea Canet, F. Didierjean, G. Duchêne, R. Baumann, M. Brucker, E. Dangelser, M. Filliger, H. Friedmann, G. Gaudiot, J.-N. Grapton, H. Kocher, C. Mathieu, M.-H. Sigward, D. Thomas, S. Veeramootoo, J. Dudouet, O. Stézowski, C. Aufranc, Y. Aubert, M. Labiche, J. Simpson, I. Burrows, P.J. Coleman-Smith, A. Grant, I.H. Lazarus, P.S. Morrall, V.F.E. Pucknell, A. Boston, D.S. Judson, N. Lalović, J. Nyberg, J. Collado, V. González, I. Kuti, B.M. Nyakó, A. Maj, M. Rudigier, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, AGATA, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), University of Cologne, Istituto Nazionale di Fisica Nucleare, Sezione di Firenze (INFN, Sezione di Firenze), Istituto Nazionale di Fisica Nucleare (INFN), INFN Laboratori Nazionali di Legnaro, Istituto Nazionale di Fisica Nucleare, Sezione di Milano (INFN), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (INFN, Sezione di Padova), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Computational Science and Engineering Department [Daresbury] (STFC), Science & Technologie Facilities Council, University of Liverpool, Lund University [Lund], Uppsala University, Department of Electronic Engineering [Universitat Politecnica de Valencia], Universitat Politècnica de València (UPV), Hungarian Academy of Sciences (MTA), Institute of Physics, Polish Academy of Sciences, Polska Akademia Nauk = Polish Academy of Sciences (PAN), Department of Physics, University of Surrey, University of Surrey (UNIS), the EU FEDER funds, MINECO and Generalitat Valenciana, Spain, under the Grants FPA2014-57196-C5, PROMETEOII/2014/019, European Project: 262010,EC:FP7:INFRA,FP7-INFRASTRUCTURES-2010-1,ENSAR(2010), and European Project: 654002,H2020,H2020-INFRAIA-2014-2015,ENSAR2(2016)
Subjects: Nuclear and High Energy Physics, Plunger device, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Cyclotron, Scintillator, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Accelerator Physics and Instrumentation, Tracking (particle physics), 01 natural sciences, 7. Clean energy, law.invention, Nuclear physics, Conceptual design, law, 0103 physical sciences, PARIS LaBr3 detector, Neutron detection, Pulse shape analysis, AGATA spectrometer, 010306 general physics, Nuclear Experiment, Instrumentation, Physics, Spectrometer, VAMOS plus plus spectrometer, 010308 nuclear & particles physics, Detector, FATIMA LaBr3 detector, Acceleratorfysik och instrumentering, DIAMANT detector, NEDA detector, Author Keywords:AGATA spectrometer, Physics::Accelerator Physics, AGATA, gamma-ray tracking, GANIL facility
Abstract: The Advanced GAmma Tracking Array (AGATA) has been installed at the GANIL facility, Caen-France. This setup exploits the stable and radioactive heavy-ions beams delivered by the cyclotron accelerator complex of GANIL. Additionally, it benefits from a large palette of ancillary detectors and spectrometers to address in-beam γ-ray spectroscopy of exotic nuclei. The set-up has been designed to couple AGATA with a magnetic spectrometer, charged-particle and neutron detectors, scintillators for the detection of high-energy γ rays and other devices such as a plunger to measure nuclear lifetimes. In this paper, the design and the mechanical characteristics of the set-up are described. Based on simulations, expected performances of the AGATA l π array are presented. Title in WoS: Conceptual design of the AGATA 1 pi array at GANIL
Published: 2017

36. The performance of the γ-ray tracking array GRETINA for γ-ray spectroscopy with fast beams of rare isotopes

Author: M. Cromaz, D. C. Radford, Daniel Bazin, A. M. Forney, I. Y. Lee, S. Momiyama, N. Kobayashi, Shumpei Noji, A. Lemasson, F. Recchia, S. J. Williams, E. Lunderberg, S. Zhu, R. Titus, K. Miki, P. Fallon, Kathrin Wimmer, V. M. Bader, A. Wiens, D. Weisshaar, C. Langer, C. M. Campbell, Brandon Elman, M. Scott, P. C. Bender, T.R. Baugher, T. Lauritsen, A. O. Macchiavelli, S. R. Stroberg, J. Belarge, J. Sethi, C. Sullivan, H. L. Crawford, Alexandra Gade, M. P. Carpenter, Brenden Longfellow, and J. L. Harker
Subjects: Nuclear and High Energy Physics, Cyclotron, Bioengineering, 01 natural sciences, Electromagnetic radiation, Atomic, law.invention, Nuclear physics, symbols.namesake, Optics, Particle and Plasma Physics, law, 0103 physical sciences, Gamma spectroscopy, Nuclear, 010306 general physics, Spectroscopy, Instrumentation, Physics, Spectrometer, 010308 nuclear & particles physics, business.industry, Detector, Molecular, Nuclear & Particles Physics, GRETINA, Rare-isotope beams, γ-ray spectroscopy, Other Physical Sciences, gamma-ray spectroscopy, Measuring instrument, symbols, business, Doppler effect, Astronomical and Space Sciences
Abstract: © 2016 Elsevier B.V. The γ-ray tracking array GRETINA was coupled to the S800 magnetic spectrometer for spectroscopy with fast beams of rare isotopes at the National Superconducting Cyclotron Laboratory on the campus of Michigan State University. We describe the technical details of this powerful setup and report on GRETINA's performance achieved with source and in-beam measurements. The γ-ray multiplicity encountered in experiments with fast beams is usually low, allowing for a simplified and efficient treatment of the data in the γ-ray analysis in terms of Doppler reconstruction and spectral quality. The results reported in this work were obtained from GRETINA consisting of 8 detector modules hosting four high-purity germanium crystals each. Currently, GRETINA consists of 10 detector modules.
Published: 2017

37. Pygmy dipole resonance in 124Sn populated by inelastic scattering of 17O

Author: A. Pullia, J. Eberth, Sunniva Siem, D. R. Napoli, N. Karkour, S. Lunardi, A. Giaz, D. S. Judson, K. Mazurek, Elena Litvinova, A. Gottardo, P. Molini, Roman Gernhäuser, F. Recchia, S. Ceruti, Begoña Quintana, R. Avigo, D. Bazzacco, R. Nicolini, P. Bednarczyk, Roberto Menegazzo, M. Kmiecik, D. Mengoni, A. Bracco, S. Brambilla, P. A. Söderström, L. Charles, M. Zieblinski, P. Désesquelles, A. I. Morales, Marco Bellato, J. Grebosz, G. Benzoni, Luna Pellegri, O. Wieland, B. Birkenbach, J. Simpson, C. Michelagnoli, O. Stezowski, C. A. Ur, Bo Cederwall, S. Leoni, M.D. Salsac, G. de Angelis, A. Maj, E. Farnea, Ch. Theisen, J. J. Valiente Dobon, Roberto Isocrate, C. Boiano, Herbert Hess, M. Krzysiek, F. Camera, M. Ciemala, Andreas Görgen, S. Bottoni, E. G. Lanza, N. Blasi, B. Siebeck, F. C. L. Crespi, A. Gadea, D. Bortolato, P. Reiter, V. Vandone, B. Million, J. Jolie, A. Jungclaus, and SCOAP
Subjects: Elastic scattering, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Isoscalar, Gamma ray, Inelastic scattering, 01 natural sciences, 7. Clean energy, Resonance (particle physics), lcsh:QC1-999, Isospin character, Low-lying electric dipole excitations, Ion, Nuclear physics, Dipole, Low-lying electric dipole excitations 124Sn, 0103 physical sciences, AGATA, Atomic physics, 010306 general physics, 124Sn, lcsh:Physics
Abstract: L. Pellegri et al. ; 5 pags. ; 6 figs. ; open access article under the CC BY license. Funded by SCOAP3, © 2014 The Authors. The γ decay from the high-lying states of 124Sn was measured using the inelastic scattering of 17O at 340 MeV. The emitted γ rays were detected with high resolution with the AGATA demonstrator array and the scattered ions were detected in two segmented δE-E silicon telescopes. The angular distribution was measured both for the γ rays and the scattered 17O ions. An accumulation of E1 strength below the particle threshold was found and compared with previous data obtained with (γ, γ') and (α, α'γ) reactions. The present results of elastic scattering, and excitation of E2 and E1 states were analysed using the DWBA approach. From this comprehensive description the isoscalar component of the 1- excited states was extracted. The obtained values are based on the comparison of the data with DWBA calculations including a form factor deduced using a microscopic transition density., Grant No. 2011/03/B/ST2/01894; (iii) the National Superconducting Cyclotron Laboratory at MSU; (iv) the US NSF Grant PHY-1204486; and the German BMBF under Grant 06KY9136.
Published: 2014
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38. Pulse shape analysis for segmented germanium detectors implemented in graphics processing units

Author: Enrico Calore, D. Bazzacco, and F. Recchia
Subjects: Physics, Nuclear and High Energy Physics, OpenCL, Spectrometers, Spectrometer, business.industry, Detector, GPU, chemistry.chemical_element, Germanium, Program processors, Power (physics), Computer graphics, chemistry, Grid-search, Pulse phape analysis, Hyperparameter optimization, Pulse shape analysis, AGATA, Graphics, business, Instrumentation, AGATA, GPU, Grid-search, OpenCL, Pulse phape analysis, Computer graphics, Spectrometers, Computer hardware
Abstract: Position sensitive highly segmented germanium detectors constitute the state-of-the-art of the technology employed for γ - spectroscopy studies. The operation of large spectrometers composed of tens to hundreds of such detectors demands enormous amounts of computing power for the digital treatment of the signals. The use of Graphics Processing Units (GPUs) has been evaluated as a cost-effective solution to meet such requirements. Different implementations and the hardware constraints limiting the performance of the system are examined.
Published: 2013

39. Octupole strength in the neutron-rich calcium isotopes

Author: Shumpei Noji, S. D. Gregory, F. G. DeVone, Daniel Bazin, F. Recchia, D. M. McPherson, L. A. Riley, Michael L. Agiorgousis, E. Lunderberg, Remco Zegers, M. Scott, B. V. Sadler, D. Weisshaar, Alexandra Gade, P. D. Cottle, M. T. Glowacki, M. Bowry, K. W. Kemper, T.R. Baugher, and E. B. Haldeman
Subjects: Physics, Nuclear and High Energy Physics, Isotope, Proton, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, 7. Clean energy, Isotopes of calcium, Excited state, Proton scattering, 0103 physical sciences, Neutron, Physics::Atomic Physics, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy
Abstract: Low-lying excited states of the neutron-rich calcium isotopes $^{48-52}$Ca have been studied via $\gamma$-ray spectroscopy following inverse-kinematics proton scattering on a liquid hydrogen target using the GRETINA $\gamma$-ray tracking array. The energies and strengths of the octupole states in these isotopes are remarkably constant, indicating that these states are dominated by proton excitations., Comment: 15 pages, 3 figures
Published: 2016

40. Spectroscopy of $^{35}$P using the one-proton knockout reaction

Author: T. Roger, F. Rotaru, C. Borcea, A. Mutschler, D. Weisshaar, Kathrin Wimmer, A. Lemasson, O. Sorlin, F. Recchia, Marine Vandebrouck, D. Bazin, Alexandra Gade, J. A. Tostevin, H. Iwasaki, S. R. Stroberg, E. Khan, M. Stanoiu, A. Lepailleur, R. Borcea, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), NSCL and Department of Physics and Astronomy (NSCL), NSCL, National Institut for Nuclear Physics and Engineering (IFIN HH), National Institut for Nuclear Physics and Engineering, TRIUMF [Vancouver], Department of Physics, University of Surrey, University of Surrey (UNIS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Angular momentum, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Projectile, Nuclear Theory, FOS: Physical sciences, Parity (physics), 24.50.+g,25.60.Gc,21.10.Jx,25.60.Lg, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 3. Good health, Cardinal point, Excited state, 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment (nucl-ex), 010306 general physics, Spectroscopy, Nuclear Experiment, Excitation
Abstract: The structure of $^{35}$P was studied with a one-proton knockout reaction at88~MeV/u from a $^{36}$S projectile beam at NSCL. The $\gamma$ rays from thedepopulation of excited states in $^{35}$P were detected with GRETINA, whilethe $^{35}$P nuclei were identified event-by-event in the focal plane of theS800 spectrograph. The level scheme of $^{35}$P was deduced up to 7.5 MeV using$\gamma-\gamma$ coincidences. The observed levels were attributed to protonremovals from the $sd$-shell and also from the deeply-bound $p\_{1/2}$ orbital.The orbital angular momentum of each state was derived from the comparisonbetween experimental and calculated shapes of individual ($\gamma$-gated)parallel momentum distributions. Despite the use of different reactions andtheir associate models, spectroscopic factors, $C^2S$, derived from the$^{36}$S $(-1p)$ knockout reaction agree with those obtained earlier from$^{36}$S($d$,\nuc{3}{He}) transfer, if a reduction factor $R\_s$, as deducedfrom inclusive one-nucleon removal cross sections, is applied to the knockout transitions.In addition to the expected proton-hole configurations, other states were observedwith individual cross sections of the order of 0.5~mb. Based on their shiftedparallel momentum distributions, their decay modes to negative parity states,their high excitation energy (around 4.7~MeV) and the fact that they were notobserved in the ($d$,\nuc{3}{He}) reaction, we propose that they may resultfrom a two-step mechanism or a nucleon-exchange reaction with subsequent neutronevaporation. Regardless of the mechanism, that could not yet be clarified, thesestates likely correspond to neutron core excitations in \nuc{35}{P}. Thisnewly-identified pathway, although weak, offers the possibility to selectivelypopulate certain intruder configurations that are otherwise hard to produceand identify., Comment: 5 figures, 1 table, accepted for publication in Physical Review C
Published: 2016

41. High-spin structure of Xe134

Author: J. J. Valiente-Dobón, A. O. Macchiavelli, T. Mijatović, P. R. John, G. de Angelis, Alberto Pullia, Suzana Szilner, A. M. Stefanini, D. Cline, A. Blazhev, X. Liang, F. Radeck, E. Fioretto, A. Gadea, C. A. Ur, M. Cromaz, F. C. L. Crespi, F. Recchia, C. J. Pearson, Andreas Görgen, W. Korten, A. B. Hayes, D. Bazzacco, P. Reiter, S. J. Freeman, P. Fallon, R. S. Chakrawarthy, A. Bracco, T. Steinbach, G. Pollarolo, R. Teng, Luna Pellegri, Daniel Ward, Zs. Podolyák, G. Montagnoli, O. Stezowski, J. Jolie, B. Birkenbach, C. Wheldon, A. Gottardo, S. Lunardi, D. Montanari, Herbert Hess, C. Y. Wu, M. Bowry, A. Vogt, P. H. Regan, B. Bruyneel, Agnese Giaz, L. Corradi, G. Sletten, A. Jungclaus, M. Siciliano, H. Hua, V. Vandone, W. Gelletly, E. Farnea, Fernando Scarlassara, J. Eberth, J. F. Smith, S. Leoni, Roberto Menegazzo, D. Mengoni, Robert Chapman, A. Gengelbach, D. R. Napoli, E. Sahin, K. Geibel, I. Y. Lee, C. Michelagnoli, D. D. Warner, Pär-Anders Söderström, B. Szpak, Andreas Wiens, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), AGATA, Federal Ministry of Education and Research (Germany), European Commission, Ministerio de Ciencia e Innovación (España), Ministerio de Economía y Competitividad (España), Bonn-Cologne Graduate School of Physics and Astronomy, Science and Technology Facilities Council (UK), National Science Foundation (US), Generalitat Valenciana, Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, Nuclear structure, Analytical chemistry, Molecular, Spin structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 01 natural sciences, 7. Clean energy, Atomic, Nuclear & Particles Physics, Subatomär fysik, Particle and Plasma Physics, 0103 physical sciences, Subatomic Physics, Heavy ion, Gammasphere, AGATA, Nuclear, 010306 general physics, Spin (physics), Nuclear Experiment
Abstract: A. Vogt et al. ; 12 págs.; 9 figs.; 1 tab., Detailed spectroscopic information on the N∼82 nuclei is necessary to benchmark shell-model calculations in the region. The nuclear structure above long-lived isomers in Xe134 is investigated after multinucleon transfer (MNT) and actinide fission. Xenon-134 was populated as (i) a transfer product in Xe136+U238 and Xe136+Pb208 MNT reactions and (ii) as a fission product in the Xe136+U238 reaction employing the high-resolution Advanced Gamma Tracking Array (AGATA). Trajectory reconstruction has been applied for the complete identification of beamlike transfer products with the magnetic spectrometer PRISMA. The Xe136+Pt198 MNT reaction was studied with the γ-ray spectrometer GAMMASPHERE in combination with the gas detector array Compact Heavy Ion Counter (CHICO). Several high-spin states in Xe134 on top of the two long-lived isomers are discovered based on γγ-coincidence relationships and information on the γ-ray angular distributions as well as excitation energies from the total kinetic energy loss and fission fragments. The revised level scheme of Xe134 is extended up to an excitation energy of 5.832 MeV with tentative spin-parity assignments up to 16+. Previous assignments of states above the 7- isomer are revised. Latest shell-model calculations employing two different effective interactions reproduce the experimental findings and support the new spin and parity assignments., The research leading to these results has received funding from the German BMBF under Contract No. 05P12PKFNE TP4, from the European Union Seventh Framework Programme FP7/2007–2013 under Grant Agreement No. 262010 - ENSAR, from the Spanish Ministerio de Ciencia e Innovación under Contract No. FPA2011-29854-C04, from the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2014-57196-C5, from the Bonn-Cologne Graduate School of Physics and Astronomy (BCGS), from the UK Science and Technology Facilities Council (STFC), and from the US National Science Foundation (NSF). One of the authors (A. Gadea) has been supported by the Generalitat Valenciana, Spain, under Grant No. PROMETEOII/2014/019 and EU under the FEDER program.
Published: 2016

42. Shape coexistence from lifetime and branching-ratio measurements in 68,70Ni

Author: S. Suchyta, S. J. Quinn, C. J. Prokop, T. Lauritsen, Robert Grzywacz, J. L. Harker, N. Larson, Mohammad Alshudifat, Benjamin P. Crider, J. J. Carroll, S. Zhu, A. Spyrou, C. J. Chiara, Sean Liddick, Alexander Dombos, A. D. Ayangeakaa, Jun Chen, F. Recchia, W. B. Walters, Rebecca Lewis, M. P. Carpenter, R. V. F. Janssens, H. M. David, and Shintaro Go
Subjects: Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Branching fraction, Nuclear Theory, Molecular, 01 natural sciences, Atomic, Nuclear & Particles Physics, lcsh:QC1-999, Particle and Plasma Physics, Affordable and Clean Energy, 0103 physical sciences, Neutron, Nuclear, Atomic physics, 010306 general physics, Wave function, lcsh:Physics, Excitation, Mathematical Physics, Astronomical and Space Sciences
Abstract: Author(s): Crider, BP; Prokop, CJ; Liddick, SN; Al-Shudifat, M; Ayangeakaa, AD; Carpenter, MP; Carroll, JJ; Chen, J; Chiara, CJ; David, HM; Dombos, AC; Go, S; Grzywacz, R; Harker, J; Janssens, RVF; Larson, N; Lauritsen, T; Lewis, R; Quinn, SJ; Recchia, F; Spyrou, A; Suchyta, S; Walters, WB; Zhu, S | Abstract: Shape coexistence near closed-shell nuclei, whereby states associated with deformed shapes appear at relatively low excitation energy alongside spherical ones, is indicative of the rapid change in structure that can occur with the addition or removal of a few protons or neutrons. Near 68Ni (Z=28, N=40), the identification of shape coexistence hinges on hitherto undetermined transition rates to and from low-energy 0+ states. In 68,70Ni, new lifetimes and branching ratios have been measured. These data enable quantitative descriptions of the 0+ states through the deduced transition rates and serve as sensitive probes for characterizing their nuclear wave functions. The results are compared to, and consistent with, large-scale shell-model calculations which predict shape coexistence. With the firm identification of this phenomenon near 68Ni, shape coexistence is now observed in all currently accessible regions of the nuclear chart with closed proton shells and mid-shell neutrons.
Published: 2016

43. Structure of the As, Ge, Ga nuclei

Author: D. Bazzacco, D. Mengoni, M. D. Salsac, A. Khouaja, S. M. Lenzi, E. Sahin, A. F. Lisetskiy, Kenia Teodoro Wiedemann, R. P. Singh, D. Curien, J. J. Valiente-Dobón, E. Fioretto, P. Mason, U. Datta Pramanik, A. Gottardo, J. Ollier, I. Stefan, R. Chapman, L. Corradi, F. Recchia, S. Courtin, R. Orlandi, G. Benzoni, B.J.P. Gall, S. Aydin, J. F. Smith, T. Byrski, K. Zuber, R. Moro, S. Erturk, Igor T. Čeliković, Predrag Ujić, Alejandro Algora, A. M. Stefanini, E. Farnea, M. Labiche, Dieter Ackermann, D. Verney, S. Leoni, G. Montagnoli, R. Silvestri, D. Lebhertz, P. T. Wady, F. Haas, G. Pollarolo, M. Yalcinkaya, A. Gadea, B. Mouginot, F. Ibrahim, O. Dorvaux, F. Azaiez, T. Faul, J. Robin, C. Michelagnoli, S. Franchoo, D. A. Torres, S. Szilner, David O'Donnell, C. A. Ur, Fernando Scarlassara, M. Trotta, A. Kusoglu, M. N. Erduran, B. Guiot, V. Modamio, K. Subotic, G. Duchêne, S. Lunardi, D. Montanari, G. de Angelis, F. Didierjean, M. Bostan, D. Tonev, D. R. Napoli, Elif Ince, J. R. B. Oliveira, and G. La Rana
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Band gap, Nuclear Theory, SHELL model, Shell (structure), Structure (category theory), 01 natural sciences, Stability (probability), Coincidence, 0103 physical sciences, Order (group theory), Atomic physics, 010306 general physics
Abstract: The level structures of the N = 50 83As, 82Ge, and 81Ga isotones have been investigated by means of multi-nucleon transfer reactions. A first experiment was performed with the CLARA–PRISMA setup to identify these nuclei. A second experiment was carried out with the GASP array in order to deduce the γ-ray coincidence information. The results obtained on the high-spin states of such nuclei are used to test the stability of the N = 50 shell closure in the region of 78Ni ( Z = 28 ). The comparison of the experimental level schemes with the shell-model calculations yields an N = 50 energy gap value of 4.7(3) MeV at Z = 28 . This value, in a good agreement with the prediction of the finite-range liquid-drop model as well as with the recent large-scale shell model calculations, does not support a weakening of the N = 50 shell gap down to Z = 28 .
Published: 2012

44. Transition probabilities in neutron-richSe84,86

Author: Alain Goasduff, K. Kolos, Fernando Scarlassara, W. Korten, R. Lozeva, P. Désesquelles, A. M. Stefanini, E. Ellinger, C Theisen, Caterina Michelagnoli, D. Verney, V. Vandone, C. Fransen, O. Möller, Thomas Braunroth, G. Pollarolo, E. Farnea, M. Hackstein, Roman Gernhäuser, A. Vogt, A. Gottardo, B. Birkenbach, A. Pullia, F. Recchia, G. Montagnoli, L. Corradi, Hans-Jurgen E. Hess, M. D. Salsac, R. Menegazzo, P. Reiter, A. Jungclaus, A. Blazhev, D. Mengoni, A. Maj, J. Eberth, F. Ibrahim, A. Bracco, A. Dewald, O. Stezowski, B. Million, T. Mijatović, V. Modamio, Kamila Sieja, Suzana Szilner, F. C. L. Crespi, J. Litzinger, E. Fioretto, S. Bottoni, J. Jolie, D. Bazzacco, S. Lunardi, D. Montanari, S. Leoni, A. I. Morales, Megumi Niikura, G. de Angelis, F. Didierjean, G. Duchêne, J. Grebosz, Begoña Quintana, D. R. Napoli, Bo Cederwall, D. Rosso, J. J. Valiente Dobon, E. Sahin, Andreas Görgen, and P. A. Söderström
Subjects: Physics, Nuclear and High Energy Physics, Nuclear Theory, SHELL model, symbols.namesake, Recoil, Excited state, Quadrupole, symbols, Physics::Accelerator Physics, Neutron, Physics::Atomic Physics, Atomic physics, Nuclear Experiment, Doppler effect
Abstract: Reduced quadrupole transition probabilities for low-lying transitions in neutron-rich Se-84,Se-86 are investigated with a recoil distance Doppler shift (RDDS) experiment. The experiment was perform ...
Published: 2015

45. New low-energy0+state and shape coexistence inNi70

Author: S. Suchyta, J. L. Harker, S. J. Quinn, N. Larson, C. J. Prokop, D. Seweryniak, T. Lauritsen, Sean Liddick, Benjamin P. Crider, M. P. Carpenter, A. D. Ayangeakaa, S. Zhu, A. Spyrou, Shintaro Go, J. J. Carroll, Alexander Dombos, Rebecca Lewis, Jun Chen, R. V. F. Janssens, F. Recchia, C. J. Chiara, H. M. David, and W. B. Walters
Subjects: Physics, Nuclear and High Energy Physics, Proton, Double beta decay, Excited state, Magnetic monopole, Neutron, Atomic physics, Space (mathematics), Spectroscopy, Energy (signal processing)
Abstract: In recent models, the neutron-rich Ni isotopes around $N=40$ are predicted to exhibit multiple low-energy excited ${0}^{+}$ states attributed to neutron and proton excitations across both the $N=40$ and $Z=28$ shell gaps. In $^{68}\mathrm{Ni}$, the three observed ${0}^{+}$ states have been interpreted in terms of triple shape coexistence between spherical, oblate, and prolate deformed shapes. In the present work a new $({0}_{2}^{+})$ state at an energy of 1567 keV has been discovered in $^{70}\mathrm{Ni}$ by using $\ensuremath{\beta}$-delayed, $\ensuremath{\gamma}$-ray spectroscopy following the decay of $^{70}\mathrm{Co}$. The precipitous drop in the energy of the prolate-deformed ${0}^{+}$ level between $^{68}\mathrm{Ni}$ and $^{70}\mathrm{Ni}$ with the addition of two neutrons compares favorably with results of Monte Carlo shell-model calculations carried out in the large $fp{g}_{9/2}{d}_{5/2}$ model space, which predict a ${0}_{2}^{+}$ state at 1525 keV in $^{70}\mathrm{Ni}$. The result extends the shape-coexistence picture in the region to $^{70}\mathrm{Ni}$ and confirms the importance of the role of the tensor component of the monopole interaction in describing the structure of neutron-rich nuclei.
Published: 2015

46. Lifetime measurements ofC17excited states and three-body and continuum effects

Author: Jérémy Dohet-Eraly, Alexandra Gade, J. J. Parker, J. S. Berryman, H. Iwasaki, K. Whitmore, F. Recchia, D. Bazin, Alban Lemasson, C. Morse, C. Loelius, Robert Roth, Petr Navrátil, D. Weisshaar, Joachim Langhammer, C. Langer, A. O. Macchiavelli, S. R. Stroberg, Kathrin Wimmer, D. Smalley, Sofia Quaglioni, C. M. Campbell, V. M. Bader, and P. Fallon
Subjects: Physics, Nuclear and High Energy Physics, Transition strength, Excited state, Continuum (design consultancy), SHELL model, Atomic physics
Abstract: Author(s): Smalley, D; Iwasaki, H; Navratil, P; Roth, R; Langhammer, J; Bader, VM; Bazin, D; Berryman, JS; Campbell, CM; Dohet-Eraly, J; Fallon, P; Gade, A; Langer, C; Lemasson, A; Loelius, C; Macchiavelli, AO; Morse, C; Parker, J; Quaglioni, S; Recchia, F; Stroberg, SR; Weisshaar, D; Whitmore, K; Wimmer, K | Abstract: We studied transition rates for the lowest 1/2+ and 5/2+ excited states of C17 through lifetime measurements with the GRETINA array using the recoil-distance method. The present measurements provide a model-independent determination of transition strengths giving the values of B(M1;1/2+→3/2g.s.+)=1.04-0.12+0.03×10-2μN2 and B(M1;5/2+→3/2g.s.+)=7.12-0.96+1.27×10-2μN2. The quenched M1 transition strength for the 1/2+→3/2g.s.+ transition, with respect to the 5/2+→3/2g.s.+ transition, has been confirmed with greater precision. The current data are compared to importance-truncated no-core shell model calculations addressing effects due to continuum and three-body forces.
Published: 2015

47. Conceptual design and infrastructure for the installation of the first AGATA sub-array at LNL

Author: A. Triossi, D. Conventi, A. M. Stefanini, G. Montagnoli, D. Lersch, D. Bazzacco, S. Aydin, John Paul Strachan, B. Bruyneel, C. He, Agnese Giaz, S. Brambilla, S. Fantinel, Enrico Calore, E. Sahin, A. Bracco, B. Million, S. M. Lenzi, R. Peghin, A. Gottardo, L. Berti, G. Maron, Alessandro Zucchiatti, B. Birkenbach, E. Fioretto, Gheorghe Pascovici, V. Vandone, C. Fanin, M. Bellato, E. Legay, N. Blasi, J. Grebosz, F. Zocca, A. Gadea, E. Bissiato, C. A. Ur, O. Stezowski, Roberto Menegazzo, D. Mengoni, Alberto Pullia, E. Farnea, P.M. Jones, Joël Chavas, Roberto Isocrate, M. Nicoletto, Damiano Bortolato, N. Dosme, P. Reiter, G. Rampazzo, A. Corsi, S. Badoer, S. Coelli, Herbert Hess, R. Beunard, Francesco Lelli, F. Recchia, A. Cortesi, M. Ozille, F. C. L. Crespi, Th. Pissulla, J. Jolie, A. Colombo, J. Eberth, G. Salvato, D. R. Napoli, T. Habermann, E. Grodner, C. Boiano, Ch. Fransen, L. Costa, A. Austin, C. Veyssiere, Fernando Scarlassara, F. Tomasi, P. Cocconi, R. Nicolini, N. Toniolo, S. Leoni, A. Dewald, R. Venturelli, R. Griffiths, C. Michelagnoli, L. Corradi, D. Rosso, V. F. E. Pucknell, E. Viscione, F. Veronese, Stefano Riboldi, A. Capsoni, C. Rossi Alvarez, Oliver Wieland, J. Simpson, X. Grave, S. Lunardi, M. Turcato, D. Montanari, G. de Angelis, M. Pignanelli, G. Benzoni, P. Molini, A. Latina, M. Rigato, W. Rother, L. Ramina, F. Camera, J. J. Valiente-Dobón, M. Rebeschini, Andreas Wiens, O. Möller, M. Gulmini, Research Group: Information Management, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire d'Orsay (IPNO), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, AGATA, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Sabire Yazıcı Fen-Edebiyat Fakültesi, Triossi, Andrea -- 0000-0001-5140-9154, Montanari, Daniele -- 0000-0002-1980-7686, Gadea, Andres -- 0000-0002-4233-1970, Calore, Enrico -- 0000-0002-2301-3838, Napoli, Daniel Ricardo -- 0000-0002-8154-6958, Menegazzo, Roberto -- 0000-0002-3060-5276, Zucchiatti, Alessandro -- 0000-0002-3647-596X, Sahin, Eda -- 0000-0003-0683-5140, Jones, Pete -- 0000-0001-7480-6603, benzoni, giovanna -- 0000-0002-7938-0338, GOTTARDO, Andrea -- 0000-0002-0390-5767, Montagnoli, Giovanna -- 0000-0002-8944-1456, Recchia, Francesco -- 0000-0002-8428-0112, GIAZ, Agnese -- 0000-0002-2550-450X, Pullia, Alberto -- 0000-0002-6393-747X, Scarlassara, Fernando -- 0000-0002-4663-8216, Nicoletto, Marino -- 0000-0001-9301-0782, Lelli, Francesco -- 0000-0003-1900-9171, and Camera, Franco -- 0000-0003-1731-4834
Subjects: Nuclear and High Energy Physics, DANTE Heavy-ion Detector, Physics::Instrumentation and Detectors, HELENA multiplicity filter, 01 natural sciences, 7. Clean energy, Particle detector, Nuclear physics, PRISMA spectrometer, Conceptual design, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment, 010306 general physics, Gamma detection, Instrumentation, TRACE SI detector, Physics, Spectrometer, 010308 nuclear & particles physics, business.industry, Semiconductor detector, Cologne plunger, AGATA, DANTE heavy-ion-detector, business, Computer hardware
Abstract: WOS: 000295765100014, The first implementation of the AGATA spectrometer consisting of five triple germanium detector clusters has been installed at Laboratori Nazionali di Legnaro, INFN. This setup has two major goals, the first one is to validate the gamma-tracking concept and the second is to perform an experimental physics program using the stable beams delivered by the Tandem-PIAVE-ALPI accelerator complex. A large variety of physics topics will be addressed during this campaign, aiming to investigate both neutron and proton-rich nuclei. The setup has been designed to be coupled with the large-acceptance magnetic-spectrometer PRISMA. Therefore, the in-beam prompt gamma rays detected with AGATA will be measured in coincidence with the products of multinucleon-transfer and deep-inelastic reactions measured by PRISMA. Moreover, the setup is versatile enough to host ancillary detectors, including the heavy-ion detector DANTE, the gamma-ray detector array HELENA, the Cologne plunger for lifetime measurements and the Si-pad telescope TRACE. In this paper the design; characteristics and performance figures of the setup will be described.
Published: 2011

48. Counting rate measurements for lifetime experiments using the RDDS method with the new generation γ-ray array AGATA

Author: J. J. Valiente-Dobón, D. R. Napoli, S. Courtin, F. Haas, C. A. Ur, A. Gadea, E. Farnea, Alain Goasduff, D. Mengoni, A. Gottardo, S. Lunardi, G. de Angelis, D. Bazzacco, E. Sahin, F. Recchia, C. Michelagnoli, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), and Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Lifetime measurement, Spectrometer, Detector, CLOVER DETECTOR, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Counting rate, Nuclear physics, symbols.namesake, Recoil, Excited state, gamma spectroscopy, symbols, AGATA, Gamma spectroscopy, Nuclear Experiment, Instrumentation, Doppler effect, Energy (signal processing)
Abstract: The differential Recoil Distance Doppler Shift (RDDS) method after multinucleon transfer (MNT) reactions to measure lifetimes of excited states in neutron-rich nuclei requires the use of a thick energy degrader for the recoiling ejectiles that are then detected in a spectrometer. This type of measurements greatly benefits from the use of the new generation segmented γ-ray detectors, such as the AGATA demonstrator which offers unprecedented energy and angular resolutions. In order to make an optimized choice of the material and the thickness of the degrader for lifetime measurements using the RDDS method after MNT, an experiment has been performed with the AGATA demonstrator. Counting rate measurements for different degraders are presented.
Published: 2014

49. Experimental test of the background rejection, through imaging capability, of a highly segmented AGATA germanium detector

Author: Maria Doncel, E. Farnea, F. Recchia, Begoña Quintana, and A. Gadea
Subjects: Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Detector, Compton scattering, chemistry.chemical_element, Germanium, Tracking (particle physics), Semiconductor detector, Optics, chemistry, Gamma spectroscopy, AGATA, business, Instrumentation, Background radiation
Abstract: The development of highly segmented germanium detectors as well as the algorithms to identify the position of the interaction within the crystal opens the possibility to locate the γ-ray source using Compton imaging algorithms. While the Compton-suppression shield, coupled to the germanium detector in conventional arrays, works also as an active filter against the γ rays originated outside the target, the new generation of position sensitive γ-ray detector arrays has to fully rely on tracking capabilities for this purpose. In specific experimental conditions, as the ones foreseen at radioactive beam facilities, the ability to discriminate background radiation improves the sensitivity of the gamma spectrometer. In this work we present the results of a measurement performed at the Laboratori Nazionali di Legnaro (LNL) aiming the evaluation of the AGATA detector capabilities to discriminate the origin of the γ rays on an event-by-event basis. It will be shown that, exploiting the Compton scattering formula, it is possible to track back γ rays coming from different positions, assigning them to specific emitting locations. These imaging capabilities are quantified for a single crystal AGATA detector.
Published: 2010

50. Crosstalk corrections for improved energy resolution with highly segmented HPGe-detectors

Author: Gheorghe Pascovici, P. Reiter, D. Bazzacco, B. Bruyneel, N. Warr, Herbert Hess, F. Recchia, J. Eberth, Andreas Wiens, S. Aydin, Sabire Yazıcı Fen-Edebiyat Fakültesi, and Recchia, Francesco -- 0000-0002-8428-0112
Subjects: γ-Ray instruments, Pulse shape analysis, Segmented germanium detectors, Nuclear and High Energy Physics, Instrumentation, Physics, business.industry, Resolution (electron density), Detector, Inner core, Gamma-Ray Instruments, Coincidence, Core (optical fiber), Matrix (mathematics), Optics, AGATA, business, Energy (signal processing)
Abstract: WOS: 000269865500014, Crosstalk effects of 36-fold segmented, large volume AGATA HPGe detectors cause shifts in the gamma-ray energy measured by the inner core and outer segments as function of segment multiplicity. The positions of the segment sum energy peaks vary approximately linearly with increasing segment multiplicity. The resolution of these peaks deteriorates also linearly as a function of segment multiplicity. Based on single event treatment, two methods were developed in the AGATA Collaboration to correct for the crosstalk induced effects by employing a linear transformation. The matrix elements are deduced from coincidence measurements of gamma-rays of various energies as recorded with digital electronics. A very efficient way to determine the matrix elements is obtained by measuring the base line shifts of untriggered segments using gamma-ray detection events in which energy is deposited in a single segment. A second approach is based on measuring segment energy values for gamma-ray interaction events in which energy is deposited in only two segments. After performing crosstalk corrections, the investigated detector shows a good fit between the core energy and the segment sum energy at all multiplicities and an improved energy resolution of the segment sum energy peaks. The corrected core energy resolution equals the segment sum energy resolution which is superior at all folds compared to the individual uncorrected energy resolutions. This is achieved by combining the two independent energy measurements with the core contact on the one hand and the segment contacts on the other hand., German BMBF [06KY2051]; European funding bodies; EU [R113-CF-2004-506065], This research was supported by the German BMBF under Grant 06KY2051. AGATA was supported by the European funding bodies and the EU Contract R113-CF-2004-506065.
Published: 2009

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