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151. Decay studies of new isomeric states in <math><mmultiscripts><mi>No</mi><mprescripts/><none/><mn>255</mn></mmultiscripts></math>

Author

A. Bronis, F. P. Heßberger, S. Antalic, B. Andel, D. Ackermann, S. Heinz, S. Hofmann, J. Khuyagbaatar, B. Kindler, I. Kojouharov, P. Kuusiniemi, M. Leino, B. Lommel, R. Mann, K. Nishio, A. G. Popeko, B. Streicher, B. Sulignano, J. Uusitalo, M. Venhart, A. V. Yeremin, 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), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; The decay of excited states in No255 was investigated by applying the evaporation-residue–conversion-electron correlation technique. Two new isomeric states were observed in No255 together with the previously known one. Excitation energies of the isomeric states were estimated based on the energies of conversion electrons and γ rays from correlation chains. These results were in accord with theoretical calculations based on the mean-field models. A tentative decay scheme of isomeric states in No255 is proposed, and their Nilsson configurations are discussed. The energy decrease of the 11/2−[725] Nilsson level for heavy N=153 isotones as a function of increasing proton number is confirmed.

Published
2022

152. Evidence of Partial Seniority Conservation in the $\pi{g}_{9/2}$ Shell for the $N=50$ Isotones

Author

Perez-Vidal, Rm, Gadea, A, Domingo-Pardo, C, Gargano, A, Valiente-Dobon, Jj, Clement, E, Lemasson, A, Coraggio, L, Siciliano, M, Szilner, S, Bast, M, Braunroth, T, Collado, J, Corina, A, Dewald, A, Doncel, M, Dudouet, J, de France, G, Fransen, C, Gonzalez, V, Huyuk, T, Jacquot, B, John, Pr, Jungclaus, A, Kim, Yh, Korichi, A, Labiche, M, Lenzi, S, Li, H, Ljungvall, J, Lopez-Martens, A, Mengoni, D, Michelagnoli, C, Muller-Gatermann, C, Napoli, Dr, Navin, A, Quintana, B, Ramos, D, Rejmund, M, Sanchis, E, Simpson, J, Stezowski, O, Wilmsen, D, Zielinska, M, Boston, Aj, Barrientos, D, Bednarczyk, P, Benzoni, G, Birkenbach, B, Boston, Hc, Bracco, A, Cederwall, B, Cullen, Dm, Didierjean, F, Eberth, J, Gottardo, A, Goupil, J, Harkness-Brennan, Lj, Hess, H, Judson, Ds, Kaskas, A, Korten, W, Leoni, S, Menegazzo, R, Million, B, Nyberg, J, Podolyak, Z, Pullia, A, Ralet, D, Recchia, F, Reiter, P, Rezynkina, K, Salsac, Md, Senyigit, M, Sohler, D, Theisen, C, Verney, D, 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 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), Institut Laue-Langevin (ILL), 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 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), 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
Subatomär fysik, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Physics - Theory, Atom and Molecular Physics and Optics, Subatomic Physics, Atom- och molekylfysik och optik
Abstract

International audience; The reduced transition probabilities for the $4^+_1 \to 2^+_1$ and $2^+_1 \to 0^+_1$ transitions in $^{92}$Mo and $^{94}$Ru and for the $4^+_1 \to 2^+_1$ and $6^+_1 \to 4^+_1$ transitions in $^{90}$Zr have been determined in this experiment making use of a multinucleon transfer reaction. These results have been interpreted on the basis of realistic shell-model calculations in the $f_{5/2}, p_{3/2}, p_{1/2},$ and $g_{9/2}$ proton valence space. Only the combination of extensive lifetime information and large scale shell-model calculations allowed the extent of the seniority conservation in the $N=50 g_{9/2}$ orbital to be understood. The conclusion is that seniority is largely conserved in the first $\pi{g}_{9/2}$ orbital.

Published
2022

153. JENAS 2022: European Astroparticle, Nuclear, and Particle Physicists Join Forces

Author

Andreas Haungs, Karl Jakobs, Marek Lewitowicz, Grand Accélérateur National d'Ions Lourds (GANIL), 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
Nuclear and High Energy Physics, [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph]
Abstract

International audience; The second Joint European Committee for Future Accelerators (ECFA)–Nuclear Physics European Collaboration Committee (NuPECC)–AstroParticle Physics European Consortium (APPEC) (JENAS) seminar was he...

Published
2022

154. New aspects of the low-energy structure of $^{211}\mathrm{At}$

Author

Karayonchev, V., Blazhev, A., Jolie, J., Dewald, A., Esmaylzadeh, A., Fransen, C., Häfner, G., Knafla, L., Müller-Gatermann, C., Rainovski, G., Régis, J.-M., Schomacker, K., van Isacker, P., Grand Accélérateur National d'Ions Lourds (GANIL), 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
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
Abstract

International audience; Lifetimes of low-energy states in the semimagic nucleus At211 were measured employing the recoil-distance Doppler shift and the Doppler-shift attenuation methods. The deduced transition probabilities are compared to two shell-model calculations, one using the modified Kuo-Herling interaction in a multi-j model space and the other using a semiempirical interaction for protons confined to the single-j 0h9/2 orbital. The Kuo-Herling calculations overestimates some of the ground-state transition probabilities, possibly due to contributions not included in the calculated ground-state wave function of At211. A strong underestimation of the E2 strengths involving the 7/21− state is also observed. Therefore, a modification of a single two-body matrix element of the Kuo-Herling interaction is introduced which improves the agreement with the experimental data significantly. The calculations in the single-j approximation agree very well with the measured transition probabilities, indicating that seniority can be regarded as a good quantum number in At211.

Published
2022

155. Nuclear Forces for Precision Nuclear Physics: A Collection of Perspectives

Author

Ingo Tews, Zohreh Davoudi, Andreas Ekström, Jason D. Holt, Kevin Becker, Raúl Briceño, David J. Dean, William Detmold, Christian Drischler, Thomas Duguet, Evgeny Epelbaum, Ashot Gasparyan, Jambul Gegelia, Jeremy R. Green, Harald W. Grießhammer, Andrew D. Hanlon, Matthias Heinz, Heiko Hergert, Martin Hoferichter, Marc Illa, David Kekejian, Alejandro Kievsky, Sebastian König, Hermann Krebs, Kristina D. Launey, Dean Lee, Petr Navrátil, Amy Nicholson, Assumpta Parreño, Daniel R. Phillips, Marek Płoszajczak, Xiu-Lei Ren, Thomas R. Richardson, Caroline Robin, Grigor H. Sargsyan, Martin J. Savage, Matthias R. Schindler, Phiala E. Shanahan, Roxanne P. Springer, Alexander Tichai, Ubirajara van Kolck, Michael L. Wagman, André Walker-Loud, Chieh-Jen Yang, Xilin Zhang, 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), 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), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
EFFECTIVE-FIELD-THEORY, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 530 Physics, SYMMETRY, Physics, Multidisciplinary, QUANTUM SCATTERING, FOS: Physical sciences, nucleus: structure function, computer: quantum, Nuclear Theory (nucl-th), LATTICE QCD, ELECTRON-SCATTERING, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Lattice, effective field theory, nuclear physics, MATRIX RENORMALIZATION-GROUP, PI(-)D SCATTERING, KOHN VARIATIONAL PRINCIPLE, Science & Technology, [PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat], Physics, nuclear force, High Energy Physics - Lattice (hep-lat), lattice field theory, Atomic and Molecular Physics, and Optics, High Energy Physics - Phenomenology, CORE SHELL-MODEL, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Physical Sciences, WAVE-FUNCTION, reflection
Abstract

This is a collection of perspective pieces contributed by the participants of the Institute of Nuclear Theory's Program on Nuclear Physics for Precision Nuclear Physics which was held virtually from April 19 to May 7, 2021. The collection represents the reflections of a vibrant and engaged community of researchers on the status of theoretical research in low-energy nuclear physics, the challenges ahead, and new ideas and strategies to make progress in nuclear structure and reaction physics, effective field theory, lattice QCD, quantum information, and quantum computing. The contributed pieces solely reflect the perspectives of the respective authors and do not represent the viewpoints of the Institute for Nuclear theory or the organizers of the program., Perspective pieces of the virtual INT program 21-1b "Nuclear Forces for Precision Nuclear Physics", 107 pages

Published
2022
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156. Understanding globular cluster abundances through nuclear reactions

Author

Adsley, P, Williams, M, Harrouz, D S, Carrasco-Rojas, D P, de Séréville, N, Hammache, F, Longland, R, Bastin, B, Davids, B, Faestermann, T, Fougères, C, Greife, U, Hertenberger, R, Hutcheon, D, La Cognata, M, Laird, AM, Lamia, L, Lennarz, A, Meyer, A, Santos, F d'Oliveira, Palmerini, S, Psaltis, A, Pizzone, R G, Romano, S, Ruiz, C, Tumino, A, Wirth, H-F, 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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
Nuclear Theory (nucl-th), Astrophysics - Solar and Stellar Astrophysics, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Nuclear Experiment, Astrophysics - Astrophysics of Galaxies, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

Globular clusters contain multiple stellar populations, with some previous generation of stars polluting the current stars with heavier elements. Understanding the history of globular clusters is helpful in understanding how galaxies merged and evolved and therefore constraining the site or sites of this historic pollution is a priority. The acceptable temperature and density conditions of these polluting sites depend on critical reaction rates. In this paper, three experimental studies helping to constrain astrophysically important reaction rates are briefly discussed., Comment: Submission to conference proceedings of INPC2022 in Cape Town

Published
2022
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157. New Metallic Stable Ion Beams for GANIL

Author

Lemagnen, Frederic, Barue, Christophe, Dubois, Mickael, Frigot, Romain, Lechartier, Nicolas, Metayer, Vincent, Osmond, Benoit, Grand Accélérateur National d'Ions Lourds (GANIL), 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
injection, experiment, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], ion-source, 02: Production of Highly Charged Ion Beams, plasma, ECR, Accelerator Physics
Abstract

GANIL has been producing many stable beams for nearly 40 years. Constant progress has been made in terms of intensity, stability and reliability. The intensity for some stable metallic beams now exceeds or approaches the pµA level at an energy up to 95 MeV/u: 1.14 pµA for 36S (65% enriched) at 77 MeV/u, 0.35 pµA for 58Ni (63%) at 74 MeV/u. The presentation highlights recent results obtained for 28Si, 184W and 130Te using the GANIL ‘s LCO (Large Capacity Oven) on the ECR4 ion source. To produce the tungsten beam, two injection methods were compared. For the first one, we evaporated some tungsten trioxide (WO3) with GANIL ‘s LCO. For the second one, the injection in the plasma chamber was made by using MIVOC (Metallic Ions from VOlatile compounds) with a tungsten hexacarbonyl (W(CO)6) compound. It was the first time that we used metal carbonyl compounds and the result is promising. All the tests have been qualified to obtain the level of intensity and beam stability. Theses good results led us to propose them for Physics experiments., Proceedings of the 24th International Workshop on ECR Ion Sources, ECRIS2020, East Lansing, MI, USA

Published
2022
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158. Occupation probabilities of valence orbitals relevant to neutrinoless double $\beta$ decay of $^{124}$Sn

Author

Shrivastava, A., Mahata, K., Stefan, I., Assié, M., Adsley, P., Beaumel, D., Datar, V.M., Georgiadou, A., Guillot, J., Hammache, F., Keeley, N., Kim, Y.H., Meyer, A., Nanal, V., Parkar, V.V., de Séréville, N., 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; Neutron transfer reaction measurements, relevant to the neutrinoless double β decay candidate Sn124 and its daughter Te124, have been performed. Precise measurements of both neutron addition [(d,p),(He4,He3)] and removal [(p,d),(He3,He4)] cross sections have been used to determine the occupation of valence orbitals pertinent to neutrinoless double β decay in these two nuclei. This information could be used to constrain calculations of the nuclear matrix element for the neutrinoless double β decay of Sn124. The change in the ground-state neutron vacancies in proceeding from Sn124 to Te124 is mainly found in the d3/2,5/2 and h11/2 orbitals. The occupancies of states near the Fermi level are in reasonable agreement with shell model calculations.

Published
2022

159. The β-decay of 70Kr into 70Br: Restoration of the pseudo-SU(4) symmetry

Author

Vitéz-Sveiczer, A., Algora, A., Morales, A.I., Rubio, B., Kiss, G.G., Sarriguren, P., van Isacker, P., de Angelis, G., Recchia, F., Nishimura, S., Agramunt, J., Guadilla, V., Montaner-Pizá, A., Orrigo, S.E.A., Horváth, A., Napoli, D., Lenzi, S., Boso, A., Phong, V.H., Wu, J., Söderström, P.-A., Sumikama, T., Suzuki, H., Takeda, H., Ahn, D.S., Baba, H., Doornebal, P., Fukuda, N., Inabe, N., Isobe, T., Kubo, T., Kubono, S., Sakurai, H., Shimizu, Y., Sidong, C., Blank, B., Ascher, P., Gerbaux, M., Goigoux, T., Giovinazzo, J., Grévy, S., Kurtukián Nieto, T., Magron, C., Gelletly, W., Dombrádi, Zs., Fujita, Y., Tanaka, M., Aguilera, P., Molina, F., Eberth, J., Diel, F., Lubos, D., Borcea, C., Ganioglu, E., Nishimura, D., Oikawa, H., Takei, Y., Yagi, S., Korten, W., de France, G., Davies, P., Liu, J., Lee, J., Lokotko, T., Kojouharov, I., Kurz, N., Shaffner, H., Petrovici, A., Ministry of Innovation and Technology (Hungary), Agencia Nacional de Investigación y Desarrollo (Chile), RIKEN Nishina Center for Accelerator-Based Science, University of Tokyo, Ministerio de Ciencia e Innovación (España), Ministerio de Ciencia, Innovación y Universidades (España), Consejo Superior de Investigaciones Científicas (España), Science and Technology Facilities Council (UK), Ministry of Human Capacities (Hungary), Japan Society for the Promotion of Science, Hungarian Academy of Sciences, 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-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, QRPA calculations, Kr, Pseudo-SU(4) symmetry, pn pairing, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Beta decay of, 70, GT strength distribution, Beta decay of Kr 70 | GT strength distribution | pn pairing | Pseudo-SU(4) symmetry | QRPA calculations
Abstract

8 pags., 4 figs., 1 tab., The β-decay of the even-even nucleus 70Kr with Z=N+2, has been investigated at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center using the BigRIPS fragment separator, the ZeroDegree Spectrometer, the WAS3ABI implantation station and the EURICA HPGe cluster array. Fifteen γ-rays associated with the β-decay of 70Kr into 70Br have been identified for the first time, defining ten populated states below Eexc=3300 keV. The half-life of 70Kr was derived with increased precision and found to be t1/2=45.19±0.14 ms. The β-delayed proton emission probability has also been determined as εp=0.545(23)%. An increase in the β-strength to the yrast 1+ state in comparison with the heaviest Z=N+2 system studied so far (62Ge decay) is observed that may indicate increased np correlations in the T=0 channel. The β-decay strength deduced from the results is interpreted in terms of the proton-neutron quasiparticle random-phase approximation (pnQRPA) and also with a schematic model that includes isoscalar and isovector pairing in addition to quadrupole deformation. The application of this last model indicates an approximate realization of pseudo-SU(4) symmetry in this system., This work was supported by the National Research, Development and Innovation Fund of the Ministry for Innovation and Technology, Hungary with project no. TKP2021-NKTA-42 under the TKP2021 funding scheme. FM acknowledges the support of ANID/FONDECYT Regular 1171467 and ANID/FONDECYT Regular 1221364 national projects. This work was carried out at the RIBF operated by RIKEN Nishina Center and CNS, University of Tokyo. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. This work was supported by the Spanish MICINN grants FPA2014-52823-C2-1-P, FPA2017- 83946-C2-1-P (MCIU/AEI/FEDER); Ministerio de Ciencia e Innovación grant PID2019-104714GB-C21; Centro de Excelencia Severo Ochoa del IFIC SEV-2014-0398; Junta para la Ampliación de Estudios Programme (CSIC JAE-Doc contract) co-financed by FSE, by NKFIH (NN128072), the National Research, Development and Innovation Fund of Hungary Project No. K 128729 the STFC (UK) through Grant No. ST/P005314/, the PROMETEO/2019/007 project and by the ÚNKP-20-5-DE-02 New National Excellence Program of the Ministry of Human Capacities of Hungary and by the JSPS KAKENHI of Japan (Grant No. 25247045). G.G. Kiss acknowledges support from the János Bolyai research fellowship of the Hungarian Academy of Sciences. A. A. acknowledges partial support of the JSPS Invitational Fellowships for Research in Japan (ID: L1955) P. S. acknowledges support from MCI/AEI/FEDER,UE (Spain) under grant PGC2018-093636-B-I00.

Published
2022

160. Deuteron Beam Power Ramp-Up at SPIRAL2

Author

Orduz, Angie, Di Giacomo, Marco, Ferdinand, Robin, Lagniel, Jean-Michel, Normand, Guillaume, Uriot, Didier, 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), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
LEBT, MMI, MEBT, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], MC4: Hadron Accelerators, cavity, linac, Accelerator Physics
Abstract

The SPIRAL2 linac commissioning started on 8 July 2019 after obtaining the authorisation to operate by the French Safety Authority. The tuning of the two Low Energy Beam Transport (LEBT), Radio Frequency Quadrupole (RFQ), Medium Energy Beam Transport (MEBT), Superconducting (SC) linac and High Energy Beam Transport (HEBT) was done with H⁺, 4He2+ and D⁺ beams during three periods of six months each in 2019, 2020 and 2021. The results obtained in 2021 with a D⁺ beam are presented. The strategy for the tuning of the MEBT, including three rebunchers, is described. The comparison between the beam parameter measurements and reference simulations are also presented. The main results of the power ramp-up to 10 kW in the linac with a 5 mA D⁺ beam are next reported. Finally, the extrapolation from the nominal power (200 kW) to the obtained results is analysed., Proceedings of the 13th International Particle Accelerator Conference, IPAC2022, Bangkok, Thailand

Published
2022
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161. Advanced cryogenic process control and monitoring for the SPIRAL2 superconducting LINAC

Author

Ghribi, Adnan, Aburas, Muhammad, Bernaudin, Pierre-Emmanuel, Bonnay, Patrick, Bonne, François, Corbel, Antoine, Di-Giacomo, Marco, Millet, François, Tsafak, Auriol Ngueguim, Trudel, Arnaud, Tura, Quentin, 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), Département des Systèmes Basses Températures (DSBT ), Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Graal, and ANR-09-JCJC-0036,SPIRAL(2009)

Subjects
Accelerator Physics (physics.acc-ph), Technology, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], FOS: Physical sciences, cavity, Accelerator Physics, cryomodule, cryogenics, Physics - Data Analysis, Statistics and Probability, controls, Physics - Accelerator Physics, linac, [PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], Data Analysis, Statistics and Probability (physics.data-an)
Abstract

SPIRAL2 is a superconducting accelerator for protons, deuterons and heavy ions delivering a maximum beam power of 200 kW at 40 MeV (for deuteron beams). 26 superconducting quarter wave cavities are operated at 4.4 K, plunged in a liquid helium bath with a drastic phase separator pressure control. Previous years have seen the development of advanced process control for cryogenics allowing to cope with high heat load dynamics thanks to an automatic heat dissipation compensation and a model based control. The latter is based on models, using the Simcryogenics library, optimized and linearised in the Programmable Logic Controllers. The SPIRAL2 operation has demonstrated that such control allows to keep the specified conditions for RF and beam operation even at levels of heat load dissipation approaching the physical limits of the cryogenic system. These developments allowed to synthesise a virtual observer of the dynamic heat load dissipated by the cavities. The present paper summarises the development of such observer based on the physical thermodynamic model and on machine learning techniques., Proceedings of the 31st International Linear Accelerator Conference, LINAC2022, Liverpool, UK

Published
2022
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162. Superconducting Cavity and RF Control Loop Model for the SPIRAL2 Linac

Author

Bouly, Frédéric, Di Giacomo, Marco, Leyge, Jean-François, Tontayeva, Mereke, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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 ), Université Grenoble Alpes (UGA), Grand Accélérateur National d'Ions Lourds (GANIL), 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
Technology, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], LLRF, controls, feedback, cavity, linac, Accelerator Physics
Abstract

The SPIRAL2 superconducting linac has been successfully commissioned with protons in 2020. During the commissioning, a model of the cavity and its LLRF control loop has been developed. The model enables to have better understanding of the system and was used to guide the tuning of the PI(D) correctors for beam loading compensation. Here we review the development of such a tool, computed with MATLAB Simulink and using the frequency domain (Laplace transfer function) to model the cavity RF and mechanical behaviours (Lorentz detuning), as well as all elements that compose the RF control loop (digital LLRF, amplifier, transmission lines, etc.). The benchmarking of the model with measurement carried out with the proton beam is also discussed in this contribution., Proceedings of the 31st International Linear Accelerator Conference, LINAC2022, Liverpool, UK

Published
2022
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163. Internal Heating in Magnetars: Role of Electron Captures

Author

Nicolas Chamel, Anthea Francesca Fantina, Lami Suleiman, Julian-Leszek Zdunik, Pawel Haensel, 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 Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Nuclear Theory (nucl-th), History, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Computer Science Applications, Education
Abstract

The role of electron captures by nuclei in the shallow heating of magnetars is further investigated using both nuclear measurements and the theoretical atomic mass table HFB-27. Starting from the composition of the outer crust in full equilibrium, we have calculated the onset of electron captures and the heat released due to the slow decay of the magnetic field. Numerical results are found to be similar to those previously obtained with the HFB-24 atomic mass model and are consistent with neutron-star cooling data., Comment: 6 pages, 1 figure. Contribution to the proceedings of the XLIV Brazilian Workshop on Nuclear Physics

Published
2022
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164. Properties of pasta phases in catalyzed neutron stars

Author

Thi, H. Dinh, Fantina, A. F., Gulminelli, F., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-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), 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
High Energy Astrophysical Phenomena (astro-ph.HE), Nuclear Theory (nucl-th), Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

Exotic non-spherical configurations of nuclei, known as ``pasta" phases, are expected to be present at the bottom of the inner crust of a neutron star. We study the properties of these configurations in catalyzed neutron stars within a compressible liquid-drop model approach, with surface parameters optimized to reproduce experimental nuclear masses. Our results show that the properties of the pasta phases exhibit strong model dependence. To estimate the model uncertainties, a Bayesian analysis is performed, combining information from nuclear physics experiments and chiral perturbation theoretical calculations with astrophysical observations. The inferred posterior distributions are discussed, with particular focus on the effect of the low-density energy functional on the predictions., Comment: Proceedings of the International Workshop on Multi-facets of EOS and Clustering 2021; published in Il Nuovo Cimento C

Published
2022
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165. Control System of the SPIRAL2 Superconducting Linac Cryogenic System

Author

Trudel, Arnaud, Bonnay, Patrick, Duteil, Guillaume, Ghribi, Adnan, Tura, Quentin, 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 Nanosciences et Cryogénie (INAC), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

Subjects
cryomodule, cryogenics, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Device Control and Integrating Diverse Systems, Physics::Accelerator Physics, controls, PLC, cavity, Accelerator Physics
Abstract

The SPIRAL2 cryogenic system has been designed to cool down and maintain stable operation conditions of the 26 LINAC superconducting resonating cavities at a temperature of 4.5 K or lower. The control system of the cryogenic system of the LINAC is based on an architecture of 20 PLCs. Through an independent network, it drives the instrumentation, the cryogenic equipment, the 26 brushless motors of the frequency tuning system, interfaces the Epics Control System, and communicates process information to the Low Level Radio Frequency, vacuum, and magnet systems. Its functions are to ensure the safety of the cryogenic system, to efficiently control the cooldown of the 19 cryomodules, to enslave the frequency tuning system for the RF operation, and to monitor and analyze the data from the process. A model based Linear Quadratic regulation controls simultaneously both phase separators the liquid helium level and pressure. This control system also makes it possible to perform a number of virtual verification tests via a simulator and a dedicated PLC used to develop advanced model based control, such as a real time heat load estimator based on a Luenberger Filter, Proceedings of the 18th International Conference on Accelerator and Large Experimental Physics Control Systems, ICALEPCS2021, Shanghai, China

Published
2022
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166. The New GANIL Beams: Commissioning of SPIRAL 2 Accelerator and Resent Developments

Author

Franberg Delahaye, Hanna, 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 European Project: 212692,EC:FP7:INFRA,FP7-INFRASTRUCTURES-2007-1,SPIRAL2PP(2007)

Subjects
experiment, MMI, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Radioactive Ion Beam Facilities and other Facilities, ion-source, linac, cyclotron, Accelerator Physics
Abstract

The GANIL installation at Caen in France has been operating with warm temperatures cyclotrons for heavy ion beam physics since 1983. The accelerated stables beams widely ranges from Carbon to Uranium beams. Low energy and post accelerated radioactive ion beams are also being provided. The GANIL laboratory has newly increased their different ion beams available with the installation and commissioning of a superconducting linear accelerator ’ SPIRAL 2 and its experimental areas. The construction started in 2011, the first beam was extracted at low energy in late 2014 with pre-acceleration in 2017 and since 2019 the new installation delivers beam for nuclear physics experiments. This paper will cover the commissioning of the SPIRAL 2 installation at GANIL with its superconducting LINAC - but also the latest development of stable and radioactive beams at the cyclotrons., Proceedings of the 15th International Conference on Heavy Ion Accelerator Technology, HIAT2022, Darmstadt, Germany

Published
2022
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167. $^{178}$Hg and asymmetric fission of neutron-deficient pre-actinides

Author

A. Jhingan, C. Schmitt, A. Lemasson, S. Biswas, Y. H. Kim, D. Ramos, A. N. Andreyev, D. Curien, M. Ciemała, E. Clément, O. Dorvaux, B. De Canditiis, F. Didierjean, G. Duchêne, J. Dudouet, J. Frankland, G. Frémont, J. Goupil, B. Jacquot, C. Raison, D. Ralet, B.-M. Retailleau, L. Stuttgé, I. Tsekhanovich, A. V. Andreev, S. Goriely, S. Hilaire, J.-F. Lemaître, P. Möller, K.-H. Schmidt, 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), 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 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Nuclear Theory (nucl-th), Nuclear Theory, FOS: Physical sciences, Nuclear Physics - Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Fission at low excitation energy is an ideal playground to probe the impact of nuclear structure on nuclear dynamics. While the importance of structural effects in the nascent fragments is well established in the (trans-)actinide region, the observation of asymmetric fission in several neutron-deficient pre-actinides can be explained by various mechanisms. To deepen our insight into that puzzle, an innovative approach based on inverse kinematics and an enhanced version of the VAMOS++ heavy-ion spectrometer was implemented at the GANIL facility, Caen. Fission of $^{178}$Hg was induced by fusion of $^{124}$Xe and $^{54}$Fe. The two fragments were detected in coincidence using VAMOS++ supplemented with a new SEcond Detection arm. For the first time in the pre-actinide region, access to the pre-neutron mass and total kinetic energy distributions, and the simultaneous isotopic identification of one the fission fragment, was achieved. The present work describes the experimental approach, and discusses the pre-neutron observables in the context of an extended asymmetricfission island located southwest of $^{208}$Pb. A comparison with different models is performed, demonstrating the importance of this new asymmetric-fission island for elaborating on driving effects in fission. Fission at low excitation energy is an ideal playground to probe the impact of nuclear structure on nuclear dynamics. While the importance of structural effects in the nascent fragments is well-established in the (trans-)actinide region, the observation of asymmetric fission in several neutron-deficient pre-actinides can be explained by various mechanisms. To deepen our insight into that puzzle, an innovative approach based on inverse kinematics and an enhanced version of the VAMOS++ heavy-ion spectrometer was implemented at the GANIL facility, Caen. Fission of $^{178}$Hg was induced by fusion of $^{124}$Xe and $^{54}$Fe. The two fragments were detected in coincidence using VAMOS++ supplemented with a new SEcond Detection arm. For the first time in the pre-actinide region, access to the pre-neutron mass and total kinetic energy distributions, and the simultaneous isotopic identification of one the fission fragment, was achieved. The present work describes the experimental approach, and discusses the pre-neutron observables in the context of an extended asymmetric-fission island located south-west of $^{208}Pb. A comparison with different models is performed, demonstrating the importance of this "new" asymmetric-fission island for elaborating on driving effects in fission.

Published
2022
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168. Structure of <math display='inline'><mrow><mmultiscripts><mrow><mi>Ca</mi></mrow><mprescripts/><none/><mrow><mn>36</mn></mrow></mmultiscripts></mrow></math> under the Coulomb Magnifying Glass

Author

Lalanne, L., Sorlin, O., Poves, A., Assié, M., Hammache, F., Koyama, S., Suzuki, D., Flavigny, F., Girard-Alcindor, V., Lemasson, A., Matta, A., Roger, T., Beaumel, D., Blumenfeld, Y., Brown, B.A., de Oliveira Santos, F., Delaunay, F., de Séréville, N., Franchoo, S., Gibelin, J., Guillot, J., Kamalou, O., Kitamura, N., Lapoux, V., Mauss, B., Morfouace, P., Niikura, M., Pancin, J., Saito, T.Y., Stodel, C., Thomas, J-C., 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), 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 corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-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, Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; Detailed spectroscopy of the neutron-deficient nucleus Ca36 was obtained up to 9 MeV using the Ca37(p,d)Ca36 and the Ca38(p,t)Ca36 transfer reactions. The radioactive nuclei, produced by the LISE spectrometer at GANIL, interacted with the protons of the liquid hydrogen target CRYPTA, to produce light ejectiles (the deuteron d or triton t) that were detected in the MUST2 detector array, in coincidence with the heavy residues identified by a zero-degree detection system. Our main findings are (i) a similar shift in energy for the 11+ and 21+ states by about -250 keV, as compared with the mirror nucleus S36; (ii) the discovery of an intruder 02+ state at 2.83(13) MeV, which appears below the first 2+ state, in contradiction with the situation in S36; and (iii) a tentative 03+ state at 4.83(17) MeV, proposed to exhibit a bubble structure with two neutron vacancies in the 2s1/2 orbit. The inversion between the 02+ and 21+ states is due to the large mirror energy difference (MED) of -516(130) keV for the former. This feature is reproduced by shell model calculations, using the sd-pf valence space, predicting an almost pure intruder nature for the 02+ state, with two protons (neutrons) being excited across the Z=20 magic closure in Ca36 (S36). This mirror system has the largest MEDs ever observed, if one excludes the few cases induced by the effect of the continuum.

Published
2022

169. Negative heat capacity for hot nuclei: confirmation with formulation from the microcanonical ensemble

Author

Borderie, B., Piantelli, S., Frankland, J. D., Neindre, N. Le, 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), 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 corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Theory (nucl-th), Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

By using freeze-out properties of multifragmenting hot nuclei produced in quasifusion central $^{129}$Xe+$^{nat}$Sn collisions at different beam energies (32, 39, 45 and 50 AMeV) which were estimated by means of a simulation based on experimental data collected by the $4\pi$ INDRA multidetector, heat capacity in the thermal excitation energy range 4 - 12.5 AMeV was calculated from total kinetic energies and multiplicities at freeze-out. The microcanonical formulation was employed. Negative heat capacity which indicates a first order phase transition for finite systems is observed and confirms previous results using a different method., Comment: 7 pages with 5 figures. arXiv admin note: substantial text overlap with arXiv:2010.02736

Published
2022
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170. Sub-millisecond atom-to-ion transformation in the TULIP ISOL system

Author

P. Jardin, M. MacCormick, V. Bosquet, P. Chauveau, S. Damoy, P. Delahaye, M. Dubois, M. Fadil, M. Lalande, C. Michel, J.-C. Thomas, 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), and Jardin, Pascal

Subjects
radioactive ion beam, Nuclear and High Energy Physics, [SPI]Engineering Sciences [physics], SPIRAL1, [SPI] Engineering Sciences [physics], ISOL, TULIP project, Instrumentation, neutron-deficient Rb isotope
Abstract

TULIP (Target Ion Source for Short‐Lived Isotope Production) is an original Isotope Separator On Line project dedicated to the production of short lived neutron deficient ions. It was tested for the first time in March 2022 at GANIL (Grand Accélérateur National d’Ions Lourds ) / SPIRAL1 (Système de Production d’Ions Radioactifs Accélérés en Ligne, phase 1) with the production of Rb isotopes using a primary beam of 22Ne at an energy of 4.5 MeV/A. 76Rb and 78Rb isotope rates of ~4.E3 and ~6.E4 pps were measured for a primary beam intensity of 6.E12 pps and may be improved by a factor between 5 to10. A remarkably short atom-to-ion transformation (AIT) time close to 200 µs was achieved. This result demonstrates how beneficial the design of the TULIP target ion source system is in term of response time and allows us to confidently look forward 74Rb+ production, which is one of the goal of the TULIP project.The results obtained on Rb production suggests testing the principle for the production of more sticky elements. Ions from metallic isotopes around 100Sn will be the next objective., TULIP (Target Ion Source for Short‐Lived Isotope Production) est un projet original de séparateur d'isotopes en ligne dédié à la production d'ions de faible durée de vie et déficients en neutrons. Il a été testé pour le première fois en mars 2022 à GANIL (Grand Accélérateur National d’Ions Lourds ) / SPIRAL1 (Système de Production d’Ions Radioactifs Accélérés en Ligne, phase 1) pour la production d'isotopes de Rb en utilisant un faisceau primaire d'ions 22Ne à une énergie de 4.5 MeV/A. Des taux d'isotopes de 76Rb et de 78Rb de ~4.E3 et de ~6.E4 pps ont été mesurés pour une intensité de faisceau primaire de 6.E12 pps, et pourraient être améliorés d'un facteur 5 à 10.Un temps de transformation remarquablement court proche de 200 µs a été obtenu. Ces résultats démontrent combien la conception du système cible source TULIP peut être bénéfique en termes de temps de réponse et nous permet sereinement d'envisager la production d'ions 74Rb+, qui est un des objectifs du projet TULIP.Les résultats obtenus pour la production de Rb suggèrent de tester le principe pour la production d'éléments plus collants. La production d'ions à partir d'isotopes métalliques autour de l'étain 100 sera le prochain objectif.

Published
2022

171. New narrow resonances observed in the unbound nucleus <math><mmultiscripts><mi mathvariant='normal'>F</mi><mprescripts/><none/><mn>15</mn></mmultiscripts></math>

Author

Girard-Alcindor, V., Mercenne, A., Stefan, I., de Oliveira Santos, F., Michel, N., Płoszajczak, M., Assié, M., Lemasson, A., Clément, E., Flavigny, F., Matta, A., Ramos, D., Rejmund, M., Dudouet, J., Ackermann, D., Adsley, P., Assunção, M., Bastin, B., Beaumel, D., Benzoni, G., Borcea, R., Boston, A.J., Cáceres, L., Cederwall, B., Celikovic, I., Chudoba, V., Ciemala, M., Collado, J., Crespi, F.C.L., d'Agata, G., de France, G., Delaunay, F., Diget, C., Domingo-Pardo, C., Eberth, J., Fougères, C., Franchoo, S., Galtarossa, F., Georgiadou, A., Gibelin, J., Giraud, S., González, V., Goyal, N., Gottardo, A., Goupil, J., Grévy, S., Guimaraes, V., Hammache, F., Harkness-Brennan, L.J., Hess, H., Oliver, D.S. Judson, Kamalou, O., Kameneyero, A., Kiener, J., Korten, W., Koyama, S., Labiche, M., Lalanne, L., Lapoux, V., Leblond, S., Lefevre, A., Lenain, C., Leoni, S., Li, H., Lopez-Martens, A., Maj, A., Matea, I., Menegazzo, R., Mengoni, D., Meyer, A., Million, B., Monteagudo, B., Morfouace, P., Mrazek, J., Niikura, M., Piot, J., Podolyak, Zs., Portail, C., Pullia, A., Quintana, B., Recchia, F., Reiter, P., Rezynkina, K., Roger, T., Rojo, J.S., Rotaru, F., Salsac, M.D., Benitez, A.M. Sánchez, Sanchis, E., Şenyigit, M., de Séréville, N., Siciliano, M., Simpson, J., Sohler, D., Sorlin, O., Stanoiu, M., Stodel, C., Suzuki, D., Theisen, C., Thomas, J.C., Ujic, P., Valiente-Dobón, J.J., Zielińska, M., 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), 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)-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 ANR-17-CE31-0026,OASIS,Optimisation d'Agata pour la physique(2017)

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; The structure of the unbound F15 nucleus is investigated using the inverse kinematics resonant scattering of a radioactive O14 beam impinging on a CH2 target. The analysis of H1(O14,p)O14 and H1(O14,2p)N13 reactions allowed the confirmation of the previously observed narrow 1/2− resonance, near the two-proton decay threshold, and the identification of two new narrow 5/2− and 3/2− resonances. The newly observed levels decay by 1p emission to the ground of O14, and by sequential 2p emission to the ground state of N13 via the 1− resonance of O14. Gamow shell model (GSM) analysis of the experimental data suggests that the wave functions of the 5/2− and 3/2− resonances may be collectivized by the continuum coupling to nearby 2p- and 1p-decay channels. The observed excitation function H1(O14,p)O14 and resonance spectrum in F15 are well reproduced in the unified framework of the GSM.

Published
2022

172. Seismic Analysis for Safety Requirements of SPIRAL2 Accelerator

Author

Barthe-Dejean, Cécile, Lutton, Franck, Michel, Matthieu, Grand Accélérateur National d'Ions Lourds (GANIL), 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
Technology, experiment, detector, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], vacuum, linac, simulation, Accelerator Physics
Abstract

The SPIRAL2 Accelerator at GANIL is a superconducting ion continuous wave LINAC with two associated experimental areas. Mechanical engineers have been highly involved in the design of SPIRAL2 equipments since the beginning of the project in 2004. During the development phase, Computer Aided Design and calculation codes have been used throughout the complete process : from the ion sources, the LINAC, the beam transport lines and the experimental halls equipped with detectors. SPIRAL2 has to meet different safety requirements, among which seismic hazard. This involves justifying that the integrity of the radiologic containment barrier is always maintained in case of earthquake. This paper reports the improvement in design and calculation methods performed by GANIL engineers to meet the seismic safety requirements, specificly the non-missility feature of the equpiment. The modal-spectral simulations, used to demonstrate the mechanical strength of equipments in case of earthquakes, was an important part of this design activity in the past 10 years New methods have been used to calculate welds, fasteners and the ground anchor of the structural supports of the heaviest equipments., Proceedings of the 31st International Linear Accelerator Conference, LINAC2022, Liverpool, UK

Published
2022
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173. Structure of <math><mmultiscripts><mi>As</mi><mprescripts/><none/><mn>83</mn></mmultiscripts><mo>,</mo></math> <math><mmultiscripts><mi>As</mi><mprescripts/><none/><mn>85</mn></mmultiscripts><mo>,</mo></math> and <math><mmultiscripts><mi>As</mi><mprescripts/><none/><mn>87</mn></mmultiscripts></math>: From semimagicity to <math><mi>γ</mi></math> softness

Author

Rezynkina, K., Dao, D.D., Duchene, G., Dudouet, J., Nowacki, F., Clément, E., Lemasson, A., Andreoiu, C., Astier, A., de Angelis, G., de France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombradi, Z., Ducoin, C., Gadea, A., Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Korichi, A., Lenzi, S.M., Li, G., Le Blanc, F., Lizarazo, C., Lozeva, R., Maquart, G., Million, B., Michelagnoli, C., Napoli, D.R., Navin, A., Perez-Vidal, R.M., Petrache, C.M., Pietralla, N., Ralet, D., Ramdhane, M., Rejmund, M., Stezowski, O., Schmitt, C., Sohler, D., Verney, D., 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 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), 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 Laue-Langevin (ILL), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; The structure of As83, As85, and As87 have been studied in fusion-fission reaction U238+Be9. Fission fragments were identified in mass and atomic number using the VAMOS++ spectrometer and the coincident γ rays were detected in the γ-ray tracking array AGATA. New transitions in As83 and As85 are reported and placed in the level schemes. A level scheme of the excited states in As87 is proposed for the first time. The data are interpreted in frame of large-scale shell-model calculations, SU3 symmetries, and beyond mean-field frameworks. A spherical regime at magic number N=50 is predicted and the location of the proton g9/2 orbital is proposed for the first time. Development of collectivity in a prolate deformed, γ-soft regime in the open shell cases As85 and As87, most neutron-rich isotopes beyond N=50, is concluded. Data and theoretical calculations give confidence to a relatively high extrapolated excitation energy about 4 MeV of the 9/2+ state in Cu79, one proton above Ni78.

Published
2022

174. Nuclear shell structure in a finite-temperature relativistic framework

Author

Herlik Wibowo, Elena Litvinova, Grand Accélérateur National d'Ions Lourds (GANIL), 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
Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph], Nuclear Theory (nucl-th), Condensed Matter - Other Condensed Matter, Astrophysics - Solar and Stellar Astrophysics, Nuclear Experiment (nucl-ex), [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Nuclear Experiment, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Solar and Stellar Astrophysics (astro-ph.SR), Other Condensed Matter (cond-mat.other)
Abstract

The shell evolution of neutron-rich nuclei with temperature is studied in a beyond-mean-field framework rooted in the meson-nucleon Lagrangian. The temperature-dependent Dyson equation with the dynamical kernel taking into account the particle-vibration coupling (PVC) is solved for the fermionic propagators in the basis of the thermal relativistic mean-field Dirac spinors. The calculations are performed for $^{68-78}$Ni in a broad range of temperatures $0 \leq T \leq 4$ MeV. The special focus is put on the fragmentation pattern of the single-particle states, which is further investigated within toy models in strongly truncated model spaces. Such models allow for quantifying the sensitivity of the fragmentation to the phonon frequencies, the PVC strength and to the mean-field level density. The model studies provide insights into the temperature evolution of the PVC mechanism in real nuclear systems under the conditions which may occur in astrophysical environments., Article: 17 pages, 19 figures

Published
2022

175. First results from the INDRA-FAZIA apparatus on isospin diffusion in $^{58,64}Ni+^{58,64}Ni$ systems at Fermi energies

Author

Ciampi, C., Piantelli, S., Casini, G., Pasquali, G., Quicray, J., Baldesi, L., Barlini, S., Borderie, B., Bougault, R., Camaiani, A., Chbihi, A., Dell'Aquila, D., Cicerchia, M., Dueñas, J.A., Fable, Q., Fabris, D., Frankland, J.D., Frosin, C., Génard, T., Gramegna, F., Gruyer, D., Hahn, K.I., Henri, M., Hong, B., Kim, S., Kordyasz, A., Kozik, T., Kweon, M.J., Lemarié, J., Le Neindre, N., Lombardo, I., Lopez, O., Marchi, T., Nam, S.H., Ordine, A., Ottanelli, P., Park, J., Park, J.H., Pârlog, M., Poggi, G., Rebillard-Soulié, A., Stefanini, A.A., Upadhyaya, S., Valdré, S., Verde, G., Vient, E., Vigilante, M., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-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), 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 des deux Infinis de Toulouse (L2IT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and INDRA-FAZIA

Subjects
Nuclear Theory (nucl-th), [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

International audience; An investigation of the isospin equilibration process in the reactions Ni58,64+Ni58,64 at two bombarding energies in the Fermi regime (32 and 52 MeV/nucleon) is presented. Data have been acquired during the first experimental campaign of the coupled INDRA-FAZIA apparatus in GANIL. Selecting from peripheral to semicentral collisions, both the neutron content of the quasiprojectile residue and that of the light ejectiles coming from the quasiprojectile evaporation have been used as probes of the dynamical process of isospin diffusion between projectile and target for the asymmetric systems. The isospin transport ratio technique has been employed. The relaxation of the initial isospin imbalance with increasing centrality has been clearly evidenced. The isospin equilibration appears stronger for the reactions at 32 MeV/nucleon, as expected due to the longer projectile-target interaction time than at 52 MeV/nucleon. Coherent indications of isospin equilibration come from the quasiprojectile residue characteristics and from particles ascribed to the quasiprojectile decay.

Published
2022

176. Electron Cyclotron Resonance Ion Source Related Research and Development Work at the Department of Physics, University of Jyväskylä (JYFL)

Author

Koivisto, Hannu, Angot, Julien, Bhaskar, Bichu, Ikonen, Anssi, Izotov, Ivan, Kalvas, Taneli, Kosonen, Sami, Kronholm, Risto, Marttinen, Miha, Maunoury, Laurent, Skalyga, Vadim, Tarvainen, Olli, Thuillier, Thomas, Timonen, Oskari, Toivanen, Ville, University of Jyväskylä (JYU), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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 ), Université Grenoble Alpes (UGA), Lobachevsky State University [Nizhni Novgorod], 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), Computational Science and Engineering Department [Daresbury] (STFC), and Science & Technologie Facilities Council

Subjects
electron, Physics::Plasma Physics, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], ion-source, 02: Production of Highly Charged Ion Beams, plasma, ECR, ECRIS, Accelerator Physics
Abstract

Recent research work of the JYFL ion source team covers multi-diagnostic studies of plasma instabilities, high-resolution plasma optical emission spectroscopy, ion current transient measurements to define the total life-time of a particle in the highly charged plasma. The JYFL team also elaborates the magnetic and technical design of the unconventional ion source named CUBE. The R work includes, in addition, the commissioning and operation of the high-performance 18 GHz ECRIS, HIISI. The instability measurements have revealed new information about the parameters affecting the onset of the plasma instabilities and shown that different instability modes exist. The ion-beam transient studies have given information about the cumulative life-time of highly-charged ions convergent with the ion temperatures deduced from the Doppler broadening of emission lines. The CUBE prototype has a minimum-B quadrupole magnetic field topology, similar to ARC-ECRIS, and its all-permanent magnet structure has been optimized for 10 GHz frequency. The CUBE design will be presented along with its commissioning status. The status and operational experience with HIISI will be reported as well., Proceedings of the 24th International Workshop on ECR Ion Sources, ECRIS2020, East Lansing, MI, USA

Published
2022
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177. Cryogenic thermoacoustics in the SPIRAL2 LINAC

Author

Adnan Ghribi, Muhammad Aburas, Abdallah Alhaffar, Pierre-Emmanuel Bernaudin, Patxi Duthil, Maroun Nemer, Jean-Pierre Thermeau, 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 Efficacité Énergétique des Systèmes (CES), Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
Accelerator Physics (physics.acc-ph), [PHYS]Physics [physics], Physics - Instrumentation and Detectors, Cryogenics, Superconducting accelerators, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Mathematics::Analysis of PDEs, FOS: Physical sciences, General Physics and Astronomy, Applied Physics (physics.app-ph), Instrumentation and Detectors (physics.ins-det), Physics - Applied Physics, Physics::Classical Physics, Thermoacoustics, LINAC, Physics - Accelerator Physics, General Materials Science, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Abstract

SPIRAL2 is a superconducting LINAC subject to cryogenic thermo-acoustic oscillations occurring in its valves-boxes. 4 years of monitoring and experimental investigations with thousands of datasets turned these unwanted effects into an opportunity to study and understand thermo-acoustics in a complex environment such as a real life accelerator. Without digging deep into Rott's thermo-acoustics theory, thoroughly shown in other works, this paper describes the instrumentation and the methods that prepare more advanced modelling of these phenomena either to damp or to harness the energy of cryogenic thermo-acoustics., 8 pages, 10 figures. arXiv admin note: text overlap with arXiv:2101.10768

Published
2022

178. Fusion hindrance and synthesis of superheavy elements

Author

Grigori Kosenko, B. G. Giraud, David Boilley, B. Bouriquet, Caiwan Shen, Anthony Marchix, Yasuhisa Abe, Research Center for Nuclear Physics (RCNP), Osaka University [Osaka], Physics Department, Omsk University, School of Science, Huzhou Tearchers College, Department of Nuclear Physics (DNP), Australian National University (ANU), 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), Université de Caen Normandie (UNICAEN), Normandie Université (NU), Service de Physique Théorique (SPhT), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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), Lion, Michel, Research Center for Nuclear Physics ( RCNP ), 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 ), Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ), Service de Physique Théorique ( SPhT ), and Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Physics, [PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th], Nuclear and High Energy Physics, Fusion, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Nuclear Theory, Shell (structure), Coulomb barrier, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Atomic and Molecular Physics, and Optics, Cold fusion, Saddle point, 0103 physical sciences, 25.70.Jj - 25.70.Gh - 24.10.Pa, Nuclear fusion, Atomic physics, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nuclear Experiment, Beam (structure), Excitation, Nuclear Physics
Abstract

A mechanism for fusion hindrance is clarified, based on the observation that the sticking configuration of projectile and target is located outside of the conditional saddle point. Accordingly, the fusion process is described by two sequential steps of passing over the Coulomb barrier and shape evolution toward the spherical compound nucleus. The latter one is indispensable in massive systems. With the use of a two-step model, excitation functions of fusion reaction are calculated for various combinations of projectiles and targets which lead to superheavy elements. The hindered fusion excitation measured is reproduced precisely without any adjustable parameter. Combined with survival probabilities calculated by the statistical theory of decay, excitation functions for residues of superheavy elements are calculated to compare with the systematic data measured for the cold fusion path. The peak positions and the widths are correctly reproduced, though it is necessary to reduce the shell correction energies of the compound nuclei predicted by the structure calculations in order to reproduce their absolute values. Predictions are made for a few unknown heavier elements. Furthermore, a preliminary attempt toward the shell closure N = 184 is also presented using a neutron-rich secondary beam.

Published
2005

179. KEWPIE: a dynamical cascade code for decaying exited compound nuclei

Author

Y. Abe, David Boilley, Bertrand Bouriquet, Yukawa Institute for Theoretical Physics, Kyoto University [Kyoto], 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 ), Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ), Yukawa Institute for Theoretical Physics (YITP), Kyoto University, 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), Université de Caen Normandie (UNICAEN), Normandie Université (NU), 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
Physics, Fission, 24.60.Dr, 25.70.Jj, 25.85.-w, Nuclear Theory, Evaporation, General Physics and Astronomy, FOS: Physical sciences, Observable, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, Nuclear Theory (nucl-th), Statistical decay, Hardware and Architecture, Cascade, Superheavy nucleus compound, Code (cryptography), Statistical physics, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Constant (mathematics), Nuclear theory, Communication channel
Abstract

A new dynamical cascade code for decaying hot nuclei is proposed and specially adapted to the synthesis of super-heavy nuclei. For such a case, the interesting channel is the tiny fraction that will decay through particles emission, thus the code avoids classical Monte-Carlo methods and proposes a new numerical scheme. The time dependence is explicitely taken into account in order to cope with the fact that fission decay rate might not be constant. The code allows to evaluate both statistical and dynamical observables. Results are successfully compared to experimental data., 15 pages, 3 Figures, Submitted to Comp. Phys. Com

Published
2003

180. Spectroscopy of the Isotopes of Transfermium Elements in Dubna: Current Status and Prospects

Author

O. N. Malyshev, J. Piot, P. Mosat, A. Lopez-Martens, M. S. Tezekbayeva, D. Tonev, V. I. Chepigin, B. Gall, Elka Stefanova, E. A. Sokol, Yu. A. Popov, K. Hauschild, A. I. Svirikhin, A. A. Kuznetsova, S. Antalic, A. V. Yeremin, A. V. Isaev, O. Dorvaux, M. L. Chelnokov, A. G. Popeko, 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), 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), 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), 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 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
Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Cyclotron, Gamma ray, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, law, 0103 physical sciences, Gamma spectroscopy, 010306 general physics, Spectroscopy, Radioactive decay
Abstract

International audience; A great many experimental studies devoted to exploring in detail the properties of radioactive decay of the isotopes of transfermium elements by means of alpha, beta, and gamma spectroscopy have been performed over the past fifteen years at the Flerov Laboratory of Nuclear Reactions (Joint Institute for Nuclear Research, Dubna). High-intensity accelerated heavy-ion beams of ${}^{22}$Ne, ${}^{48}$Ca, ${}^{50}$Ti, and ${}^{54}$Cr from the U-400 cyclotron were used in experiments with the SHELS kinematic separator. An upgrade of the separator and detector system is planned in the future with the aim of improving the transportation efficiency for the nuclei under study and the detection efficiency for gamma rays.

Published
2020

181. Decay of the 'stretched' M4 resonance in 13C

Author

D.A. Iancu, P. Kulessa, L. Stan, Y. Jaganathen, S. Bottoni, A. Maj, N. Marginean, Michele Sferrazza, S. Brambilla, P. Pawłowski, S. Ziliani, A. Bracco, M. Kmiecik, J. Łukasik, Ł. W. Iskra, B. Fornal, K. Mazurek, I. Burducea, S. Leoni, C. Boiano, R. Marginean, N. Florea, C. Clisu, F. Camera, B. Sowicki, M. Płoszajczak, M.N. Harakeh, N. Cieplicka-Oryńczak, M. Krzysiek, M. Ciemala, M. Zieblinski, J. Grebosz, B. Wasilewska, M. Matejska-Minda, 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), 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 Research unit Nuclear & Hadron Physics

Subjects
Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Proton, Nuclear Theory, Continuum (design consultancy), Cyclotron, SHELL model, General Physics and Astronomy, Resonance (particle physics), Coincidence, law.invention, Nuclear physics, law, Neutron, Nuclear Experiment
Abstract

International audience; “Stretched” states are examples of the simplest nuclear excitations in the continuum, thus offering an excellent testing ground for various theoretical approaches. The decay of the stretched single-particle state in 13C, located at 21.47 MeV, was investigated in an experiment performed recently at the Cyclotron Centre Bronowice (CCB) at IFJ PAN in Kraków. First experimental information on the proton and neutron decay channels of this resonance was obtained by employing coincidence measurement of protons inelastically scattered on the 13C target and γ rays from daughter nuclei. The new experimental findings will be used for testing predictions obtained by the Gamow Shell Model calculations.

Published
2020

182. Performance of Dye and Ti:sapphire laser systems for laser ionization and spectroscopy studies at S3

Author

C. Granados, Yu. Kudryavtsev, Klaus Wendt, Mark Huyse, J. Romans, Rafael Ferrer, N. Lecesne, H. Savajols, T. Kron, J. Piot, Sebastian Raeder, P. Van Duppen, 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, Materials science, In flight separators, Physics::Optics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Dye laser, 7. Clean energy, 01 natural sciences, Resonance ionization spectroscopy, law.invention, law, Ionization, In gas laser ionization and spectroscopy, 0103 physical sciences, sapphire laser [Ti], ddc:530, Physics::Atomic Physics, Spectral resolution, Nuclear Experiment, 010306 general physics, Spectroscopy, Instrumentation, Spectrometer, 010308 nuclear & particles physics, business.industry, Ti:sapphire laser, Laser, Sapphire, Optoelectronics, business
Abstract

The novel and sensitive In-Gas Laser Ionization Spectroscopy (IGLIS) technique enables high-precision laser spectroscopy of the heaviest elements and isotopes very far from stability that are produced in fusion-evaporation reactions at in-flight separators. Powerful and dedicated laser systems are required in these facilities to realize in-gas jet laser spectroscopy with optimal spectral resolution and efficiency. The performance with respect to the requirements for IGLIS studies at the low energy front-end of the Super Separator Spectrometer (S3) at GANIL, France, of Dye and Ti:sapphire laser systems is investigated. In addition, a number of specific experimental cases on key isotopes of the elements Ag, Sn, Ac, and No are discussed in detail. The novel and sensitive In-Gas Laser Ionization Spectroscopy (IGLIS) technique enables high-precision laser spectroscopy of the heaviest elements and isotopes very far from stability that are produced in fusion-evaporation reactions at in-flight separators. Powerful and dedicated laser systems are required in these facilities to realize in-gas jet laser spectroscopy with optimal spectral resolution and efficiency. The performance with respect to the requirements for IGLIS studies at the low energy front-end of the Super Separator Spectrometer (S3) at GANIL, France, of Dye and Ti:sapphire laser systems is investigated. In addition, a number of specific experimental cases on key isotopes of the elements Ag, Sn, Ac, and No are discussed in detail. ispartof: Nuclear Instruments & Methods In Physics Research Section B-Beam Interactions With Materials And Atoms vol:463 pages:86-95 status: published

Published
2020

183. Spectroscopy of neutron-rich nitrogen isotopes with Agata+Paris+Vamos

Author

S. Ziliani, M. Ciemała, F.C.L. Crespi, S. Leoni, B. Fornal, A. Maj, P. Bednarczyk, G. Benzoni, A. Bracco, C. Boiano, S. Bottoni, S. Brambilla, M. Bast, M. Beckers, T. Braunroth, F. Camera, N. Cieplicka-Oryńczak, E. Clément, S. Coelli, O. Dorvaux, S. Erturk, G. de France, C. Fransen, A. Goldkuhle, J. Grębosz, M.N. Harakeh, Ł.W. Iskra, B. Jacquot, A. Karpov, M. Kicińska-Habior, Y. Kim, M. Kmiecik, A. Lemasson, S.M. Lenzi, M. Lewitowicz, H. Li, I. Matea, K. Mazurek, C. Michelagnoli, M. Matejska-Minda, B. Million, C. Müller-Gatermann, V. Nanal, P. Napiorkowski, D.R. Napoli, R. Palit, M. Rejmund, Ch. Schmitt, M. Stanoiu, I. Stefan, E. Vardaci, B. Wasilewska, O. Wieland, M. Ziębliński, M. Zielińska, Ziliani, S., Ciemała, M., Crespi, F. C. L., Leoni, S., Fornal, B., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clément, E., Coelli, S., Dorvaux, O., Erturk, S., de France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M. N., Iskra, Ł. W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S. M., Lewitowicz, M., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Müller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D. R., Palit, R., Rejmund, M., Schmitt, Ch., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., Zielinska, M., 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), 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), Institut Laue-Langevin (ILL), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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 National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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), ILL, and Research unit Nuclear & Hadron Physics

Subjects
Physics, education.field_of_study, Spectrometer, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Population, Gamma ray, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Excited state, 0103 physical sciences, Neutron, AGATA, 010306 general physics, Spectroscopy, education, Beam (structure)
Abstract

Excited states of 17N, 18N and 19N were investigated through the measurement of gamma rays, following their population via deep-inelastic reactions induced by an 18O beam (7 MeV/u) on a thick 181Ta target. The experimental setup comprised the AGATA+PARIS detection system, coupled to the VAMOS++ magnetic spectrometer. In the 17N nucleus, the analysis of gamma-ray transitions de-exciting two states around 4-5 MeV clearly pointed to discrepancies with the lifetime values reported in literature. Three new gamma rays were observed in 18N at the energies of 1662.3 (3) keV, 2073.4 (8) keV and 2300.9 (8) keV, and hints for other two new transitions around 1566 keV and 1720 keV were found. In addition, a new transition with energy of 2489.7 (8) keV was observed in 19N.

Published
2020

184. $\beta^-{\rm p}$ and $\beta^-\alpha$ decay of the $^{11}$Be neutron halo ground state

Author

Okołowicz, J., Płoszajczak, M., Nazarewicz, W., Grand Accélérateur National d'Ions Lourds (GANIL), 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 Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Beta-delayed proton emission from the neutron halo ground state of $^{11}$Be raised much attention due to the unusually high decay rate. It was argued that this may be due to the existence of a resonance just above the proton decay threshold. In this Letter, we use the lenses of real-energy continuum shell model to describe several observables including the Gamow-Teller rates for the $\beta^-$-delayed $\alpha$ and proton decays, and argue that, within our model, the large $\beta^-{\rm p}$ branching ratio cannot be reconciled with other data., Comment: 5 pages, 3 figures

Published
2021

185. Narrow resonances in the continuum of the unbound nucleus $^{15}$F

Author

Girard-Alcindor, V., Mercenne, A., Stefan, I., de Oliveira Santos, F., Michel, N., Płoszajczak, M., Assié, M., Lemasson, A., Clément, E., Flavigny, F., Matta, A., Ramos, D., Rejmund, M., Dudouet, J., Ackermann, D., Adsley, P., Assunção, M., Bastin, B., Beaumel, D., Benzoni, G., Borcea, R., Boston, A.J., Cáceres, L., Cederwall, B., Celikovic, I., Chudoba, V., Ciemala, M., Collado, J., Crespi, F.C.L., D'Agata, G., De France, G., Delaunay, F., Diget, C., Domingo-Pardo, C., Eberth, J., Fougères, C., Franchoo, S., Galtarossa, F., Georgiadou, A., Gibelin, J., Giraud, S., González, V., Goyal, N., Gottardo, A., Goupil, J., Grévy, S., Guimaraes, V., Hammache, F., Harkness-Brennan, L.J., Hess, H., Oliver, D.S. Judson, Kamalou, O., Kameneyero, A., Kiener, J., Korten, W., Koyama, S., Labiche, M., Lalanne, L., Lapoux, V., Leblond, S., Lefevre, A., Lenain, C., Leoni, S., Li, H., Lopez-Martens, A., Maj, A., Matea, I., Menegazzo, R., Mengoni, D., Meyer, A., Million, B., Monteagudo, B., Morfouace, P., Mrazek, J., Niikura, M., Piot, J., Podolyak, Zs., Portail, C., Pullia, A., Quintana, B., Recchia, F., Reiter, P., Rezynkina, K., Roger, T., Rojo, J.S., Rotaru, F., Salsac, M.D., Benitez, A.M. Sánchez, Sanchis, E., Şenyigit, M., De Séréville, N., Siciliano, M., Simpson, J., Sohler, D., Sorlin, O., Stanoiu, M., Stodel, C., Suzuki, D., Theisen, C., Thomas, J.C., Ujic, P., Valiente-Dobón, J.J., Zielińska, M., 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), 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-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, Institut Pluridisciplinaire Hubert Curien (IPHC), 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
Nuclear Theory (nucl-th), Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The structure of the unbound $^{15}$F nucleus is investigated using the inverse kinematics resonant scattering of a radioactive $^{14}$O beam impinging on a CH$_2$ target. The analysis of $^{1}$H($^{14}$O,p)$^{14}$O and $^{1}$H($^{14}$O,2p)$^{13}$N reactions allowed the confirmation of the previously observed narrow $1/2^{-}$ resonance, near the two-proton decay threshold, and the identification of two new narrow 5/2$^{-}$ and 3/2$^{-}$ resonances. The newly observed levels decay by 1p emission to the ground of $^{14}$O, and by sequential 2p emission to the ground state (g.s.) of $^{13}$N via the $1^-$ resonance of $^{14}$O. Gamow shell model (GSM) analysis of the experimental data suggests that the wave functions of the 5/2$^{-}$ and 3/2$^{-}$ resonances may be collectivized by the continuum coupling to nearby 2p- and 1p- decay channels. The observed excitation function $^{1}$H($^{14}$O,p)$^{14}$O and resonance spectrum in $^{15}$F are well reproduced in the unified framework of the GSM., Comment: 7 pages, 4 figures

Published
2021

186. Structure of the negative parity states in $^{131}$Xe

Author

Chakraborty, S., Bhattacharyya, S., Banik, R., Bhattacharya, Soumik, Mukherjee, G., Biswas, S., Rajbanshi, S., Dar, Shabir, Nandi, S., Ali, Sajad, Chatterjee, S., Das, S., das Gupta, S., Ghugre, S.S., Goswami, A., Lemasson, A., Mondal, D., Mukhopadhyay, S., Pai, H., Pal, S., Pandit, D., Raut, R., Ray, Prithwijita, Rejmund, M., Samanta, S., 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 HEP, INSPIRE

Subjects
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; Low-lying negative parity states in 131Xe were studied following an α-induced reaction at VECC, Kolkata. The unfavoured signature partner of νh11/2 band has been identified with firm spin-parity assignment. The S(I) value is found to be large and comparable in magnitude with that reported in 127Xe. The detailed results along with the theoretical calculations under the framework of particlerotor model will be presented.

Published
2021

187. Study of the symmetry energy from $^{48,40}$Ca + $^{48,40}$Ca collisions at 35 AMeV

Author

Fable, Q., Chbihi, A., Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-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), and INDRA

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; In this proceeding we present recent results concerning the study of the symmetry energy coefficient of finite nuclei with 40,48Ca+40,48Ca peripheral to semi-peripheral reactions at 35 MeV/nucleon. Data were obtained using the unique coupling of the VAMOS high acceptance spectrometer and the INDRA detector. VAMOS allowed high resolution measurement of charge, mass and velocity of the cold projectile-like fragment (PLF), while the INDRA detector recorded coincident charged particles with nearly 4π acceptance. This coupling allows reconstructing the mass, charge and excitation energy of the associated initial quasi-projectile nuclei (QP), as well as the extraction of apparent temperatures. The isoscaling method was applied with the fragment identified in VAMOS and the experimental reconstructed QP, in order to estimate the surface to volume contribution of the symmetry energy term of finite nuclei.

Published
2021

188. INDRA electronics upgrade

Author

Frankland, J.D., Le Neindre, N., Henri, M., Chbihi, A., Fable, Q., Gouyet, C., Revenko, R., Beaudouin, Q., Bougault, R., Bourgault, P., Genard, T., Godefroid, V., Gruyer, D., Lemarié, J., Leterrier, L., Lopez, O., Loubeau, E., Marie-Saillenfest, F., Nicolle, C., Noury, F., Perronnel, J., Prieur, M., Rebillard-Soulié, A., Rousseau, L., Saillant, F., Vient, E., 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 corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; The INDRA charged particle multidetector has been operating since 1993, and up to the first experiment coupling it with FAZIA performed in 2019 it has always functioned with the same electronics developed at the beginning of the 1990s. A major upgrade of the full electronics (both for data acquisition and power supplies) has recently been completed, in time for the next INDRA-FAZIA experiment, scheduled for April 2022. In this contribution we will present this new electronics.

Published
2021

189. Ground-state properties of super-heavy hydrogen-7

Author

Marine Vandebrouck, Riccardo Raabe, A. M. Moro, Gwen Grinyer, D. Cortina, David Pérez-Loureiro, Bertrand Jacquot, M. Caamaño, Herve Savajols, S. Sambi, C. Rodriguez-Tajes, Julien Gibelin, T. Roger, D. Ramos, J. Benlliure, J. Pancin, S. Bagchi, Naoyu Itagaki, F. Farget, B. Fernández-Domínguez, Benjamim Pietras, 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), and 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)

Subjects
Physics, Proton, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear matter, 7. Clean energy, Resonance (particle physics), Nuclear physics, Deuterium, Nuclear force, Neutron, Nucleon, Ground state, Nuclear Experiment
Abstract

The properties of nuclei with extreme neutron-to-proton ratios, far from those naturally occurring on Earth, are key to understand nuclear forces and how nucleons hold together to form nuclei. $^7$H, with six neutrons and a single proton, is the nuclear system with the most unbalanced neutron-to-proton ratio known so far. However, its sheer existence and properties are still a challenge for experimental efforts and theoretical models. Here we report the formation of $^7$H as a resonance, detected with independent observables, and the first measurement of the structure of its ground state. The resonance is found at $\sim$0.7 MeV above the $^3$H+4n mass, with a narrow width of $\sim$0.2 MeV and a $1/2^+$ spin and parity. Together, these properties picture $^7$H as a $^3$H core surrounded by an extended four-neutron halo, with a unique four-neutron decay and a relatively long half-life thanks to neutron pairing; a prime example of new phenomena occurring in the most pure-neutron nuclear matter we can access in the laboratory.

Published
2021

190. Observation of excited states in the neutron-rich nucleus Br89

Author

B. M. Nyakó, J. Timár, M. Csatlós, Zs. Dombrádi, A. J. Krasznahorkay, I. Kuti, D. Sohler, T. G. Tornyi, M. Czerwiński, T. Rząca-Urban, W. Urban, L. Atanasova, D. L. Balabanski, K. Sieja, A. Blanc, G. de France, M. Jentschel, U. Köster, P. Mutti, G. S. Simpson, T. Soldner, C. A. Ur, 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), Institut Laue-Langevin (ILL), ILL, 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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 ), Université Grenoble Alpes (UGA), 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 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 physics, medicine.anatomical_structure, 010308 nuclear & particles physics, Excited state, 0103 physical sciences, medicine, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, Nucleus
Abstract

International audience; Excited states of the neutron-rich Br89 have been observed for the first time. They were populated in cold-neutron induced fission of U235 at the PF1B facility of the Institut Laue-Langevin, Grenoble. The measurement of γ radiation following fission has been performed using the EXILL array of Ge detectors. The observed level structure looks similar to the yrast level structure of Br87. Large valence space shell model calculations performed for Br89 confirmed this similarity. Comparison of the observed πg9/2 band with the results of the shell model calculations provides information on the evolution of collectivity in this region.

Published
2021

191. Impact of Nuclear Deformation and Pairing on the Charge Radii of Palladium Isotopes

Author

Geldhof, S., Kortelainen, M., Beliuskina, O., Campbell, P., Caceres, L., Cañete, L., Cheal, B., Chrysalidis, K., Devlin, C. S., de Groote, R. P., de Roubin, A., Eronen, T., Ge, Z., Gins, W., Koszorus, A., Kujanpää, S., Nesterenko, D., Ortiz-Cortes, A., Pohjalainen, I., Moore, I. D., Raggio, A., Reponen, M., Romero, J., Sommer, F., Grand Accélérateur National d'Ions Lourds (GANIL), 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
isotoopit, Nuclear Theory, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], palladium, ydinfysiikka
Abstract

International audience; The impact of nuclear deformation can been seen in the systematics of nuclear charge radii, with radii generally expanding with increasing deformation. In this Letter, we present a detailed analysis of the precise relationship between nuclear quadrupole deformation and the nuclear size. Our approach combines the first measurements of the changes in the mean-square charge radii of well-deformed palladium isotopes between A=98 and A=118 with nuclear density functional calculations using Fayans functionals, specifically Fy(std) and Fy(Δr,HFB), and the UNEDF2 functional. The changes in mean-square charge radii are extracted from collinear laser spectroscopy measurements on the 4d95s D33→4d95p P23 atomic transition. The analysis of the Fayans functional calculations reveals a clear link between a good reproduction of the charge radii for the neutron-rich Pd isotopes and the overestimated odd-even staggering: Both aspects can be attributed to the strength of the pairing correlations in the particular functional which we employ.

Published
2021

192. Electron Captures and Stability of White Dwarfs

Author

Chamel, N., Perot, L., Fantina, A. F., Chatterjee, D., Ghosh, S., Novak, J., Oertel, M., HEP, INSPIRE, 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 Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-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 Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), [PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Theory, FOS: Physical sciences, White dwarf, Nuclear Theory (nucl-th), Chandrasekhar limit, Magnetic field, Astrophysics - Solar and Stellar Astrophysics, Astrophysics::Solar and Stellar Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph], Astrophysics - High Energy Astrophysical Phenomena, Solar and Stellar Astrophysics (astro-ph.SR), Electron capture, Astrophysics::Galaxy Astrophysics
Abstract

Electron captures by atomic nuclei in dense matter are among the most important processes governing the late evolution of stars, limiting in particular the stability of white dwarfs. Despite considerable progress in the determination of the equation of state of dense Coulomb plasmas, the threshold electron Fermi energies are still generally estimated from the corresponding $Q$ values in vacuum. Moreover, most studies have focused on nonmagnetized matter. However, some white dwarfs are endowed with magnetic fields reaching $10^9$ G. Even more extreme magnetic fields might exist in super Chandrasekhar white dwarfs, the progenitors of overluminous type Ia supernovae like SN 2006gz and SN 2009dc. The roles of the dense stellar medium and magnetic fields on the onset of electron captures and on the structure of white dwarfs are briefly reviewed. New analytical formulas are derived to evaluate the threshold density for the onset of electron captures for arbitrary magnetic fields. Their influence on the structure of white dwarfs is illustrated by simple analytical formulas and numerical calculations., 20 pages, 5 figures, contribution to the Sixteenth Marcel Grossmann Meeting - MG16

Published
2021

193. A study of the suitability of the LISE2000 spectrometer for SIRIUS commissioning experiments

Author

Chakma, R., Piot, Julien, 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 Grand Accélérateur National d'Ions Lourds

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

SIRIUS is a focal-plane detection system aimed to conduct decay spectroscopic studies on heavy and superheavy nuclei. For commissioning the setup, the LISE2000 spectrometer at GANIL was selected due to its availability. Simulations with the LISE++ code showed that the transmission efficiency of the spectrometer is rather small 0.5 %. This study has confirmed this result and also reports why this facility is not suitable for commissioning SIRIUS.

Published
2021

194. Test of the SIRIUS tracker using a $^{252}$Cf source

Author

Chakma, R., Pancin, J., 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 Grand Accélérateur National d'Ions Lourds

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

A test on the ion tracking device of the SIRIUS integrated with the NUMEXO2 electronics was performed. The times-of-flight of the fission fragments from a 252 Cf source were measured using digital constant-fraction discriminators. The parameters of the constant-fraction discriminators were optimized considering the known velocity distribution of the fission fragments from a 252 Cf source. The test gave comparable results that were obtained in some earlier studies on this device.

Published
2021

195. Boulay et al. Reply: Comment on 'g Factor of the Zr99(7/2+) Isomer: Monopole Evolution in the Shape-Coexisting Region'

Author

Boulay, F., Simpson, G.S., Ichikawa, Y., Kisyov, S., Bucurescu, D., Takamine, A., Ahn, D.S., Asahi, K., Baba, H., Balabanski, D.L., Egami, T., Fujita, T., Fukuda, N., Funayama, C., Furukawa, T., Georgiev, G., Gladkov, A., Hass, M., Imamura, K., Inabe, N., Ishibashi, Y., Kawaguchi, T., Kawamura, T., Kim, W., Kobayashi, Y., Kojima, S., Kusoglu, A., Lozeva, R., Momiyama, S., Mukul, I., Niikura, M., Nishibata, H., Nishizaka, T., Odahara, A., Ohtomo, Y., Ralet, D., Sato, T., Shimizu, Y., Sumikama, T., Suzuki, H., Takeda, H., Tao, L.C., Togano, Y., Tominaga, D., Ueno, H., Yamazaki, H., Yang, X.F., Daugas, J.M., Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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 ), Université Grenoble Alpes (UGA), 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), 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
21.60.-n, 25.70.Mn, 23.20.En, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], numbers: 21.10.Ky, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2021

196. Complete set of bound negative-parity states in the neutron-rich nucleus 18N

Author

S. Ziliani, M. Ciemała, F. C. L. Crespi, S. Leoni, B. Fornal, T. Suzuki, T. Otsuka, A. Maj, P. Bednarczyk, G. Benzoni, A. Bracco, C. Boiano, S. Bottoni, S. Brambilla, M. Bast, M. Beckers, T. Braunroth, F. Camera, N. Cieplicka-Oryńczak, E. Clément, S. Coelli, O. Dorvaux, S. Erturk, G. de France, C. Fransen, A. Goldkuhle, J. Grębosz, M. N. Harakeh, Ł. W. Iskra, B. Jacquot, A. Karpov, M. Kicińska-Habior, Y. Kim, M. Kmiecik, A. Lemasson, S. M. Lenzi, M. Lewitowicz, H. Li, I. Matea, K. Mazurek, C. Michelagnoli, M. Matejska-Minda, B. Million, C. Müller-Gatermann, V. Nanal, P. Napiorkowski, D. R. Napoli, R. Palit, M. Rejmund, Ch. Schmitt, M. Stanoiu, I. Stefan, E. Vardaci, B. Wasilewska, O. Wieland, M. Ziębliński, M. Zielińska, 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), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, 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 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
Set (abstract data type), Physics, Particle physics, medicine.anatomical_structure, 010308 nuclear & particles physics, 0103 physical sciences, medicine, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Parity (mathematics), 01 natural sciences, Nucleus
Abstract

International audience; High-resolution γ-ray spectroscopy of N18 is performed with the Advanced GAmma Tracking Array, following deep-inelastic processes induced by an O18 beam on a Ta181 target. Six states are newly identified, which together with the three known excitations exhaust all negative-parity excited states expected in N18 below the neutron threshold. Spin and parities are proposed for all located states on the basis of decay branchings and comparison with large-scale shell-model calculations performed in the p-sd space, with the YSOX interaction. Of particular interest is the location of the 01− and 12− excitations, which provide strong constrains for cross-shell p-sd matrix elements based on realistic interactions and help to simultaneously reproduce the ground and first-excited states in N16 and N18, for the first time. Understanding the N18 structure may also have significant impact on neutron-capture cross-section calculations in r-process modeling including light neutron-rich nuclei.

Published
2021

197. The capture of injected 1+ ions in charge breeder electron cyclotron resonance ion source plasma

Author

O Tarvainen, J Angot, T Thuillier, M Migliore, L Maunoury, P Chauveau, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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 ), Université Grenoble Alpes (UGA), Grand Accélérateur National d'Ions Lourds (GANIL), 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
[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Condensed Matter Physics
Abstract

The capture process of the 1+ ions in charge breeder electron cyclotron resonance ion sources has been attributed to cumulative small-angle scattering of the incident ions in ion–ion collisions with the buffer gas ions. The model results in controversy between the plasma potential and ion temperature values derived from simulations, and those found in the experiments. We demonstrate that the 1+ ion capture process is dominated by the slowing down of the incident ions by the ambipolar plasma potential, which has previously been assigned with a secondary importance. In this revised view, supported by experimental data, the 1+ capture does not depend on the mass of the injected and plasma ion species, or the ion temperature, which resolves the disagreement between modelling and experiments.

Published
2022

198. Proton 3D tracking and emission time from a short-lived isomer with ACTAR TPC

Author

J. Giovinazzo, T. Roger, B. Blank, D. Rudolph, H. Alvarez-Pol, A. Arokiaraj, P. Ascher, M. Camaaño-Fresco, L. Caceres, D.M. Cox, B. Fernández-Domínguez, J. Lois-Fuentes, M. Gerbaux, S. Grévy, G.F. Grinyer, O. Kamalou, B. Mauss, A. Mentana, A. Ortega Moral, J. Pancin, J. Pibernat, J. Piot, O. Sorlin, C. Stodel, J.-C. Thomas, M. Versteegen, Laboratoire de Physique des Deux Infinis Bordeaux (LP2I - Bordeaux), Université de Bordeaux (UB)-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), 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
p: tracks, data analysis method, Nuclear and High Energy Physics, track data analysis, Short-lived decays, ACTAR TPC, Proton radioactivity, tracks: length, Track reconstruction, time projection chamber, nickel: nuclide, efficiency, radioactivity, decay: time, branching ratio, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation
Abstract

International audience; An experiment was conducted at the GANIL/LISE3 facility to produce the 10+ isomer of 54Ni and measure its proton radioactivity decay branches. The proton detection was achieved with the ACTAR TPC device that enabled the separation of the small signal of the emitted proton from the large signal of the implanted ion, while the decay half-life is of the order of 150 ns. From the measured data, the emitted proton track length and the decay time of the ion can be extracted simultaneously. The full proton radioactivity pattern could be established, with two emission branches and their relative branching ratio. Data processing and analysis that allowed to identify and separate the ion and the proton signals in order to reconstruct the particles trajectories and decay time are detailed. The evaluation of the detection efficiency for the proton radioactivity branches based on a full simulation is described.

Published
2022

199. Fusion dynamics of massive heavy-ion systems

Author

Takahiro Wada, Jing Dong Bao, B. G. Giraud, David Boilley, Yasuhisa Abe, Grigori Kosenko, Cai Wang Shen, 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 ), Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ), Lion, Michel, 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 Caen Normandie (UNICAEN), Normandie Université (NU), 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
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th], Physics, Fusion, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Physics and Astronomy (miscellaneous), Dynamics (mechanics), Superheavy Elements, Ion, medicine.anatomical_structure, Phase (matter), medicine, Heavy ion, Atomic physics, Nuclear Experiment, Nucleus, Fusion mechanism, [ PHYS.NUCL ] Physics [physics]/Nuclear Theory [nucl-th]
Abstract

A two-step model is proposed for the fusion mechanism of massive heavy-ion systems which is the most unknown part in the reaction theory for the synthesis of the superheavy elements. It consists of the approaching phase of incident ions and the dynamical shape evolution of the amalgamated system toward the spherical compound nucleus. Preliminary results are presented.

Published
2001

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