Search

Your search keyword '"Zs. Dombradi"' showing total 21 results
Start Over Author "Zs. Dombradi" Topic neutron
21 results on '"Zs. Dombradi"'

1. First spectroscopic study of $^{51}$Ar by the (p,2p) reaction

Author

Zs. Dombradi, S. Y. Park, T. Isobe, F. Browne, K. Moschner, Thomas Aumann, R.-B. Gerst, F. Château, Kathrin Wimmer, X. X. Xu, Z. Elekes, L. Zanetti, Hideaki Otsu, B. D. Linh, Hirofumi Yamada, Si-Ge Chen, P. A. Söderström, Yutaka Utsuno, Igor Gašparić, H. N. Liu, Jenny Lee, Zaihong Yang, I. Murray, Yasuhiro Togano, F. Flavigny, K. I. Hahn, L. Stuhl, Yuya Kubota, V. Wagner, Tomohiro Uesaka, A. Giganon, D. Kim, M. MacCormick, C. Lehr, V. Panin, L. X. Chung, P. Koseoglou, T. Lokotko, Y.L. Sun, E. Sahin, K. Yoneda, Victor Vaquero, M. L. Cortés, Takashi Nakamura, S. Franchoo, P. Doornenbal, Satoshi Takeuchi, Masahiro Yasuda, O. Aktas, A. Gillibert, V. Lapoux, Nobuyuki Chiga, Takaharu Otsuka, T. Koiwai, Hiroyoshi Sakurai, T. Motobayashi, M. M. Juhász, Kazuki Yoshida, David Steppenbeck, Julien Gibelin, H. Törnqvist, Toshio Kobayashi, Kazuyuki Ogata, W. Rodriguez, N. L. Achouri, C. Hilaire, S. Wang, Donghang Yan, N. Paul, A. Obertelli, J. M. Gheller, Yosuke Kondo, V. Werner, D. Calvet, D. M. Rossi, Masaki Sasano, H. Baba, D. Sohler, A. Corsi, A. Delbart, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), 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), 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), 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), RIKEN Nishina Center for Accelerator-Based Science, European Research Council, European Commission, Helmholtz International Center for FAIR, German Research Foundation, Alexander von Humboldt Foundation, Ministry of Science and Technology of Vietnam, Government of South Korea, Agencia Estatal de Investigación (España), Federal Ministry of Education and Research (Germany), Helmholtz Graduate School for Hadron and Ion Research, and National Research, Development and Innovation Office (Hungary)

Subjects
Nuclear and High Energy Physics, Shell closure, γ -ray spectroscopy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 0103 physical sciences, Bound state, nuclear shell model, proton knock-out reaction, gamma-ray spectroscopy, invariant-mass method, radioactive beams, Invariant mass, Neutron, ddc:530, Nuclear structure, 010306 general physics, Spectroscopy, Physics, Valence (chemistry), Proton knock-out reaction, 010308 nuclear & particles physics, Invariant mass method, Isotopes of argon, lcsh:QC1-999, Excited state, γ-ray spectroscopy, Atomic physics, lcsh:Physics
Abstract

8 pags., 4 figs., 3 tabs., The nuclear structure of 51Ar, an uncharted territory so far, was studied by the (p,2p) reaction using γ-ray spectroscopy for the bound states and the invariant mass method for the unbound states. Two peaks were detected in the γ-ray spectrum and six peaks were observed in the 50Ar+n relative energy spectrum. Comparing the results to our shell-model calculations, two bound and six unbound states were established. Three of the unbound states could only be placed tentatively due to the low number of counts in the relative energy spectrum of events associated with the decay through the first excited state of 50Ar. The low cross sections populating the two bound states of 51Ar could be interpreted as a clear signature for the presence of significant subshell closures at neutron numbers 32 and 34 in argon isotopes. It was also revealed that due to the two valence holes, unbound collective states coexist with individual-particle states in 51Ar., We are very grateful to the RIKEN Nishina Center accelerator staff for providing the stable beam and to the BigRIPS team for the smooth operation of the secondary beams. The development of the MINOS device has been supported by the European Research Council through the ERC Grant No. MINOS-258567. F. B. was supported by the RIKEN Special Postdoctoral Researcher Program. K. O. acknowledges the support by Grant-in-Aid for Scientific Research JP16K05352. Y. U. acknowledges the support by Grant-in-Aid for Scientific Research 20K03981. Y. L. S. acknowledges the support of Marie Skłodowska-Curie Individual Fellowship (H2020-MSCA-IF-2015-705023) from the European Union and the support from the Helmholtz International Center for FAIR. H. N. L. acknowledges the support from the Enhanced Eurotalents program (PCOFUND-GA-2013-600382) co-funded by CEA and the European Union. T. A., C. L., D. R., H. T., V. W., L. Z., H. N. L., V. W. and A. O. acknowledge the support from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) Project No. 279384907-SFB 1245. R. B. G. acknowledges the support from the DFG under Grant No. BL 1513/1-1. Y. L. S. and A. O. acknowledge the support from the Alexander von Humboldt Foundation. B. D. L. and L. X. C. acknowledge the support from the Vietnam Ministry of Science and Technology under Grant No. ĐTCB.01/21/VKHKTHN. I. G. has been supported by HIC for FAIR and HRZZ under project No. 1257 and 7194. K. I. H., D. K. and S. Y. P. acknowledge the support from the NRF grant funded by the Korea government (No. 2017R1A2B2012382 and 2019M7A1A1033186). F. B. acknowledge the support from the RIKEN Special Postdoctoral Researcher Program. D. S. and Z. E. were supported by projects No. GINOP-2.3.3-15-2016-00034 and No. K128947. V. V. acknowledges support from the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2017-84756-C4-2-P. V. W. and P. K. acknowledge the support from BMBF grants 05P15RDFN1 and 05P19RDFN1. P. K. acknowledges support from HGS-HIRe. This work was also supported by NKFIH (114454).

Published
2021
Full Text
View/download PDF

2. Medium-spin states of the neutron-rich nucleus $^{87}$Br

Author

Michael Jentschel, Ulli Köster, A. Krasznahorkay, Aurelien Blanc, P. Bączyk, L. Atanasova, Paolo Mutti, M. Czerwiński, T. Rząca-Urban, Gary Simpson, T. Soldner, Zs. Dombradi, B. M. Nyakó, D. L. Balabanski, Kamila Sieja, D. Sohler, T. G. Tornyi, M. Csatlós, István Kuti, C. A. Ur, W. Urban, János Timár, Institute for Nuclear Research [Budapest] (ATOMKI), Hungarian Academy of Sciences (MTA), University of Warsaw (UW), Medical University of Sofia [Bulgarie], 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 Laue-Langevin (ILL), 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 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), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), ILL, 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 de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Valence (chemistry), Spin states, Spins, Proton, 010308 nuclear & particles physics, Fission, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure, Space (mathematics), 01 natural sciences, 7. Clean energy, Excited state, 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

Medium-spin excited states of the neutron-rich nucleus $^{87}\mathrm{Br}$ were observed and studied for the first time. They were populated in fission of $^{235}\mathrm{U}$ induced by the cold-neutron beam of the PF1B facility of the Institut Laue-Langevin, Grenoble. The measurement of $\ensuremath{\gamma}$ radiation following fission was performed using the EXILL array of Ge detectors. The observed level scheme was compared with results of large valence space shell model calculations. The medium-spin level scheme consists of three bandlike structures, which can be understood as bands built on the $\ensuremath{\pi}{f}_{5/2}$, $\ensuremath{\pi}({p}_{3/2}+{f}_{5/2})$, and $\ensuremath{\pi}{g}_{9/2}$ configurations. The behavior of the observed $\ensuremath{\pi}{g}_{9/2}$ band at high spins shows a considerable deviation from the shell model predictions. This deviation in this band is probably the result of an increased collectivity, which can be understood assuming that the $\ensuremath{\pi}{g}_{9/2}$ high-$\mathit{j}$ proton polarizes the core.

Published
2021
Full Text
View/download PDF

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

Author

G. de Angelis, Eric Clément, Bo Cederwall, H. Al Azri, Mikael Sandzelius, Ulrika Jakobsson, C. M. Petrache, Chong Qi, S. S. Ghugre, V. Modamio, Zhigang Xiao, F. Ghazi Moradi, S. Erturk, G. Jaworski, Baki Akkuş, A. Algora, A. Ertoprak, M. Palacz, M. Doncel, C. Michelagnoli, Torbjörn Bäck, Eiji Ideguchi, A. Boso, H. W. Li, J. J. Valiente-Dobón, M. Siciliano, Zs. Dombradi, A. Gadea, T. Hüyük, Johan Nyberg, F. Recchia, R. Wadsworth, B. M. Nyakó, P. J. Davies, István Kuti, D. M. Debenham, D. R. Napoli, D. Sohler, A. Gottardo, János Timár, R. Raut, A. Atac, Department of Physics [Stockholm], Royal Institute of Technology [Stockholm] (KTH ), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Department of Physics, Royal Institute of Technology (KTH), 10691 Stockholm, Sweden

Subjects
[PHYS]Physics [physics], Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, 01 natural sciences, Core (optical fiber), symbols.namesake, Excited state, 0103 physical sciences, symbols, Nuclear fusion, Neutron, MAGIC (telescope), Atomic physics, 010306 general physics, Doppler effect, Line (formation)
Abstract

Lifetimes of negative-parity states have been determined in the neutron deficient semi-magic (N = 50) nucleus $$^{95}\mathrm {Rh}$$ 95 Rh . The fusion-evaporation reaction $$^{58}Ni(^{40}Ca, 3p)$$ 58 N i ( 40 C a , 3 p ) was used to populate high-spin states in $$^{95}\mathrm {Rh}$$ 95 Rh at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick $$6\;\mathrm {mg/cm}^2$$ 6 mg / cm 2 metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations.

Published
2020
Full Text
View/download PDF

4. Sequential Nature of (p,3p) Two-Proton Knockout from Neutron-Rich Nuclei

Author

Megumi Niikura, K. Yoneda, Tomohiro Uesaka, T. Miyazaki, J.-Y. Roussé, A. Jungclaus, I. G. Stefan, Masaki Sasano, A. Gillibert, Jian Liu, Hiroyoshi Sakurai, David Steppenbeck, Zs. Dombradi, K. Moschner, M. Gómez-Ramos, Satoshi Takeuchi, D. Calvet, T. Isobe, Shunji Nishimura, T. Saito, V. Lapoux, H. Wang, T. Motobayashi, L. Olivier, R. Lozeva, A. Gottardo, S. Franchoo, C. Péron, H. Baba, Jinguang Wu, G. Authelet, A. Delbart, A. Blazhev, J. M. Gheller, Hideaki Otsu, F. Château, Masafumi Matsushita, Zs. Vajta, Zena Patel, Victor Vaquero, Kathrin Wimmer, M. L. Cortés, K. Matsui, Shuichi Ota, C. Santamaria, E. C. Pollacco, M. Dewald, Alessandra Corsi, F. Browne, C. R. Nita, M. Rudigier, Z. Korkulu, Jenny Lee, Yoshiaki Shiga, K. Hadynska-Klek, S. Nagamine, Satoru Momiyama, A. Frotscher, T. Arici, Ryo Taniuchi, Noritaka Shimizu, C. R. Nobs, Toshiyuki Sumikama, Alison Bruce, C. Louchart, E. Sahin, Toshiaki Ando, Zhenci Xu, F. Giacoppo, Y. Kubota, L. X. Chung, B. D. Linh, P. Doornenbal, F. Flavigny, A. Giganon, N. Paul, C. M. Shand, Noritsugu Nakatsuka, Zi Hong Liu, V. Werner, M. Górska, Si-Ge Chen, P. A. Söderström, D. Suzuki, M. Lettmann, R. Orlandi, C. Lizarazo, A. Obertelli, Raymond J. Carroll, Bing Ding, Zs. Podolyák, Shoko Koyama, and Alan Peyaud

Subjects
Physics, Hydrogen, Proton, Projectile, Nuclear Theory, General Physics and Astronomy, chemistry.chemical_element, 01 natural sciences, Coincidence, Nuclear physics, medicine.anatomical_structure, chemistry, MINOS, 0103 physical sciences, medicine, Neutron, Nuclear Experiment, 010306 general physics, Nucleon, Nucleus
Abstract

Twenty-one two-proton knockout (p; 3p) cross sections from neutron-rich nuclei at ~ 250 MeV/nucleon were measured. For the first time, the angular distribution of the three emitted protons were measured in coincidence with the tracker and hydrogen target MINOS, demonstrating that the (p; 3p) kinematics is consistent with two sequential proton-proton collisions within the projectile nucleus. Ratios of (p; 3p) over (p; 2p) inclusive cross sections follow the trend of other many-proton (neutron) removal reactions, further reinforcing the sequential nature of (p; 3p) in neutron-rich nuclei.

Published
2020
Full Text
View/download PDF

5. Spectroscopy of 2565,67Mn: Strong coupling in the N = 40 'island of inversion'

Author

K. Matsui, H. Otsu, W.Q. Zhang, J.-Y. Roussé, Tadaaki Isobe, R. Lozeva, X.H. Zhou, Satoshi Takeuchi, X.Y. Liu, E. Sahin, Shunpei Koyama, P. Doornenbal, S. Franchoo, Zs. Dombradi, F. Nowacki, Shuichi Ota, C. Santamaria, A. Obertelli, A. Gottardo, Daisuke Suzuki, K. Hadynska-Klek, Jin Wu, L. X. Chung, Masaki Sasano, Ryo Taniuchi, Hiroyoshi Sakurai, Jenny Lee, K. Yoneda, Megumi Niikura, H.S. Xu, P. A. Söderström, C. Louchart, T. Motobayashi, Tomohiro Uesaka, Yuya Kubota, C. Péron, Tsuyoshi Miyazaki, H. Lu, G. Authelet, G. L. Stefan, V. Werner, B. D. Linh, F. Château, A. Delbart, J. M. Gheller, A. Gillibert, C. M. Shand, H. Wang, Z. Liu, S. Nishimura, Zs. Vajta, Philip M Walker, Masafumi Matsushita, Satoru Momiyama, M. Lettmann, F. Browne, S. M. Lenzi, Yoshiaki Shiga, Toshiyuki Sumikama, L. Olivier, E. C. Pollacco, Feng-Shou Zhang, F. Giacoppo, David Steppenbeck, V. Lapoux, T.H. Huang, Zena Patel, H. Baba, M. D. Sun, Y.H. Zhang, D. Calvet, Zhengyu Xu, Alan Peyaud, B. Ding, A. Corsi, Z. Korkulu, Y.H. Lam, and De-fu Hou

Subjects
Physics, Coupling, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Island of inversion, Nuclear structure, Decoupling (cosmology), 01 natural sciences, Molecular physics, Excited state, 0103 physical sciences, Neutron, 010306 general physics, Spectroscopy, Line (formation)
Abstract

Excited states in 63,65,67Mn were studied via in-beam γ-ray spectroscopy following knockout reactions from 68Fe. Similar level schemes, consisting of the 11/2−, 9/2−, 7/2− and 5/2 g.s.− level sequence, connected by I→I−1 transitions, were established, the first time for 65,67Mn. Their level structures show features consistent with strongly-coupled rotational bands with K=5/2 . State-of-the-art shell-model calculations with the modified LNPS effective interaction reproduce the observed levels remarkably well and suggest the dominance of 4-particle-4-hole neutron configurations for all the states. The data on the low-lying excited states of odd-mass 53−67Mn provide a textbook example of nuclear structure evolution from weak coupling through decoupling to strong coupling along a single isotopic chain on the n-rich side of the β stability line. These results help to deepen our understanding of the N=40 “island of inversion”.

Published
2018
Full Text
View/download PDF

6. Prominence of Pairing in Inclusive (p,2p) and (p,pn) Cross Sections from Neutron-Rich Nuclei

Author

A. Corsi, V. Lapoux, Zs. Dombradi, K. Matsui, David Steppenbeck, A. Gillibert, Alan Peyaud, Shoko Koyama, Toshiaki Ando, C. M. Shand, Hiroyoshi Sakurai, M. Rudigier, F. Browne, L. Olivier, Raymond J. Carroll, K. Yoneda, E. Sahin, Yoshiaki Shiga, Bing Ding, F. Château, Pieter Doornenbal, Hidetada Baba, Tomoyuki Saito, Tohru Motobayashi, Zs. Podolyák, Satoru Momiyama, F. Giacoppo, C. R. Nita, T. Sumikama, H. Wang, Megumi Niikura, A. Gottardo, Jenny Lee, M. Dewald, Zs. Vajta, R. Orlandi, Shuichi Ota, E. C. Pollacco, K. Hadynska-Klek, F. Flavigny, P. A. Söderström, Daisuke Suzuki, Yuya Kubota, C. Lizarazo, D. Calvet, S. Nagamine, C. Péron, Tomohiro Uesaka, R. Lozeva, Hideaki Otsu, N. Paul, Shenjian Chen, G. Authelet, Noritsugu Nakatsuka, Ryo Taniuchi, A. Delbart, Carlos A. Bertulani, J. M. Gheller, Zi Hong Liu, V. Werner, T. Arici, M. Matsushita, Masaki Sasano, M. Lettmann, B. D. Linh, C. Santamaria, Alison Bruce, J. L. Rodriguez-Sanchez, Satoshi Takeuchi, I. Stefan, M. Górska, S. Franchoo, C. Louchart, Zhengyu Xu, Zena Patel, J.-Y. Roussé, Tadaaki Isobe, S. Nishimura, A. Jungclaus, Victor Vaquero, T. Miyazaki, M. L. Cortés, A. Obertelli, K. Moschner, Kathrin Wimmer, Z. Korkulu, Jin Wu, L. X. Chung, C. R. Nobs, Jian Liu, A. Blazhev, and A. Giganon

Subjects
Physics, Hydrogen, Proton, Nuclear Theory, General Physics and Astronomy, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Nuclear physics, chemistry, Cascade, Pairing, 0103 physical sciences, Bound state, Physics::Accelerator Physics, Neutron, Nuclear Experiment, 010306 general physics, Nucleon, Beam (structure)
Abstract

Fifty-five inclusive single nucleon removal cross sections from medium mass neutron-rich nuclei impinging on a hydrogen target at � 250 MeV/nucleon were measured at the RIKEN Radioactive Isotope Beam Factory. Systematically higher cross sections are found for proton removal from nuclei with an even number of protons compared to odd-proton number projectiles for a given neutron separation energy. Neutron removal cross sections display no even-odd splitting contrary to nuclear cascade model predictions. Both effects are understood through simple considerations of neutron separation energies and bound state level densities originating in pairing correlations in the daughter nuclei. These conclusions are supported by comparison with semi-microscopic model predictions,highlighting the enhanced role of low-lying level densities in nucleon removal cross sections from loosely-bound nuclei.

Published
2019
Full Text
View/download PDF

7. Spectroscopic Study in Neutron-Rich Mn Isotopes Around the $N=40$ 'Island of Inversion'

Author

X. D. Tang, C. Péron, G. Authelet, Y. H. Lam, Shunji Nishimura, J. M. Gheller, V. Lapoux, Megumi Niikura, Tomohiro Uesaka, Masaki Sasano, D. Calvet, De-fu Hou, A. Gillibert, K. Matsui, G. L. Stefan, C. M. Shand, F. Browne, H. Baba, Toshiyuki Sumikama, P. M. Walker, M. Lettmann, Feng-Shou Zhang, F. Giacoppo, K. Yoneda, C. Santamaria, Zs. Vajta, David Steppenbeck, L. Olivier, E. C. Pollacco, C. Louchart, Jinguang Wu, Hideaki Otsu, S. M. Lenzi, Yoshiaki Shiga, Bing Ding, M. D. Sun, T. Miyazaki, Satoru Momiyama, A. Obertelli, Shuichi Ota, T. H. Huang, F. Nowacki, Hiroyoshi Sakurai, B. D. Linh, T. Motobayashi, Jenny Lee, P. A. Söderström, H. Lu, R. Lozeva, X.Y. Liu, Zena Patel, K. Hadynska-Klek, E. Sahin, Zhenci Xu, Z. Korkulu, Zs. Dombradi, Yuya Kubota, X. H. Zhou, T. Isobe, P. Doornenbal, Zi Hong Liu, V. Werner, F. Château, Satoshi Takeuchi, W.Q. Zhang, S. Franchoo, H. Wang, Y. H. Zhang, J.-Y. Roussé, L. X. Chung, H. S. Xu, Daisuke Suzuki, Alan Peyaud, A. Corsi, A. Delbart, Ryo Taniuchi, Shoko Koyama, A. Gottardo, Masafumi Matsushita, 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), 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 de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), 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), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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
Materials science, 21.10.-k, Isotope, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Island of inversion, structure evolution, Mineralogy, 23.20.Lv, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], island of inversion, Quansi-rotational band, 7. Clean energy, In-beam γ-ray spectroscopy, 21.60.Cs, Neutron, 21.10.Re
Abstract

International audience; Excited states in Mn isotopes with mass number A from 63 to 67 were studied via in-beam γ–ray spectroscopy following knockout reactions from 67,68Fe. In odd-A isotopes 63,65,67Mn, similar level schemes, consisting of the 11/2-, 9/2-, 7/2-, and 5/2-g.s. level sequence, connected by I →I -1 transitions, were established, the first time for 65,67Mn. Experimental results of odd-A Mn isotopes are compared with large-scale shell-model calculations in the model space that includes the vg9/2 and vd5/2 orbitals with the state-of-the-art LNPS effective interaction. The constructed level schemes in odd-odd isotopes 64,66Mn show rotational-like properties. Spin and parity of the excited states, as well as the πf7/2 ⊗ vg9/2 configuration of the bands are tentatively assigned based on the level systematics in the odd-odd isotopes. These new data extends the knowledge of the excited states in Mn isotopes. Discussion in terms of the systematics helps to deepen our understanding of the N = 40 “island of inversion”.

Published
2018
Full Text
View/download PDF

8. Is Seniority a Partial Dynamic Symmetry in the First $\nu g_{9/2}$ Shell?

Author

Takaharu Otsuka, Toshiyuki Sumikama, Ryo Taniuchi, Giuseppe Lorusso, Zsolt Podolyak, R. Avigo, István Kuti, G. de Angelis, Shunji Nishimura, A. I. Morales, Nunzio Itaco, P. A. Söderström, D. R. Napoli, A. Gottardo, Yusuke Tsunoda, N. Blasi, Stephen Rice, Zena Patel, P. Van Isacker, Rin Yokoyama, I. Kojouharov, G. Benzoni, V. Modamio-Hoybjor, Jinguang Wu, Zs. Dombradi, F. Browne, F. L. Bello Garrote, T. Isobe, Jan Taprogge, E. Sahin, S. Lalkovski, Satoru Momiyama, L. Coraggio, N. Kurz, Hiroyoshi Sakurai, Tsuyoshi Miyazaki, P. Doornenbal, Oliver Wieland, M. Yalcinkaya, B. Melon, Ayumi Yagi, R. Daido, F. Camera, R. Orlandi, P. H. Regan, Y. F. Fang, A. Gargano, Hirofumi Watanabe, K. Matsui, H. Schaffner, D. Mengoni, F. C. L. Crespi, M. C. Delattre, J. J. Valiente-Dobón, A. Bracco, H. Baba, Zs. Vajta, Dóra Sohler, S. Ceruti, Megumi Niikura, Zhengyu Xu, Alison Bruce, L. Sinclair, 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 Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds ( GANIL ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Institut 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 ), Morales, A. I., Benzoni, G., Watanabe, H., de Angelis, G., Nishimura, S., Coraggio, L., Gargano, A., Itaco, N., Otsuka, T., Tsunoda, Y., Van Isacker, P., Browne, F., Daido, R., Doornenbal, P., Fang, Y., Lorusso, G., Patel, Z., Rice, S., Sinclair, L., Söderström, P. -A., Sumikama, T., Valiente-Dobón, J. J., Wu, J., Xu, Z. Y., Yagi, A., Yokoyama, R., Baba, H., Avigo, R., Bello Garrote, F. L., Blasi, N., Bracco, A., Bruce, A. M., Camera, F., Ceruti, S., Crespi, F. C. L., Delattre, M. -C., Dombradi, Zs., Gottardo, A., Isobe, T., Kojouharov, I., Kurz, N., Kuti, I., Lalkovski, S., Matsui, K., Melon, B., Mengoni, D., Miyazaki, T., Modamio-Hoybjor, V., Momiyama, S., Napoli, D. R., Niikura, M., Orlandi, R., Podolyák, Zs., Regan, P. H., Sakurai, H., Sahin, E., Sohler, D., Schaffner, H., Taniuchi, R., Taprogge, J., Vajta, Zs., Wieland, O., Yalcinkaya, M., 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 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
Nuclear and High Energy Physics, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 29.30.Kv, 23.40.-s, Nuclear physics, 21.60.Cs, 0103 physical sciences, Neutron, Seniority, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nuclear Experiment, [ PHYS.NUCL ] Physics [physics]/Nuclear Theory [nucl-th], Spin-½, Physics, 010308 nuclear & particles physics, 23.20.Lv, Fermion, Quantum number, lcsh:QC1-999, Atomic physics, Nucleon, lcsh:Physics, Radioactive decay
Abstract

The low-lying structures of the midshell νg9/2 Ni isotopes 72Ni and 74Ni have been investigated at the RIBF facility in RIKEN within the EURICA collaboration. Previously unobserved low-lying states were accessed for the first time following β decay of the mother nuclei 72Co and 74Co. As a result, we provide a complete picture in terms of the seniority scheme up to the first (8+) levels for both nuclei. The experimental results are compared to shell-model calculations in order to define to what extent the seniority quantum number is preserved in the first neutron g9/2 shell. We find that the disappearance of the seniority isomerism in the (81+) states can be explained by a lowering of the seniority-four (6+) levels as predicted years ago. For 74Ni, the internal de-excitation pattern of the newly observed (62+) state supports a restoration of the normal seniority ordering up to spin J=4. This property, unexplained by the shell-model calculations, is in agreement with a dominance of the single-particle spherical regime near 78Ni. The low-lying structures of the midshell νg9/2 Ni isotopes 72Ni and 74Ni have been investigated at the RIBF facility in RIKEN within the EURICA collaboration. Previously unobserved low-lying states were accessed for the first time following β decay of the mother nuclei 72Co and 74Co. As a result, we provide a complete picture in terms of the seniority scheme up to the first (8+) levels for both nuclei. The experimental results are compared to shell-model calculations in order to define to what extent the seniority quantum number is preserved in the first neutron g9/2 shell. We find that the disappearance of the seniority isomerism in the (81+) states can be explained by a lowering of the seniority-four (6+) levels as predicted years ago. For 74Ni, the internal de-excitation pattern of the newly observed (62+) state supports a restoration of the normal seniority ordering up to spin J=4. This property, unexplained by the shell-model calculations, is in agreement with a dominance of the single-particle spherical regime near 78Ni. ispartof: Physics Letters B vol:781 pages:706-712 status: published

Published
2018
Full Text
View/download PDF

9. Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy

Author

JJ Liu, P. Lee, Shigeru Kubono, T. Lauritsen, Eunji Lee, J. J. Valiente-Dobón, S. Kanaya, Alison Bruce, H. Baba, S. Zhu, Shunji Nishimura, G. X. Zhang, Thamer Alharbi, Z. Korkulu, Zhengyu Xu, C.J. Chiara, D. Seweryniak, V. H. Phong, Gavin Lotay, C. J. Lister, C. M. Shand, Toshiyuki Kubo, Hirofumi Watanabe, Jin Wu, Y. Shimizu, Kenichi Yoshida, Zs. Vajta, C. S. Lee, I. Nishizuka, C. R. Nita, Atsuko Odahara, Chang-Bum Moon, H. Schaffner, M. P. Carpenter, F. Browne, G. J. Lane, Giuseppe Lorusso, P. M. Walker, Hiroshi Suzuki, I. Kojouharov, P. A. Söderström, D.S. Ahn, Hiroyoshi Sakurai, Eiji Ideguchi, Naohito Inabe, A. Estrade, K. Y. Chae, G.D. Dracoulis, István Kuti, Satoru Terashima, P. H. Regan, S. Lalkovski, Toshiyuki Sumikama, Hiroyuki Takeda, N. Kurz, P. Doornenbal, Zena Patel, Naoki Fukuda, Raymond J. Carroll, Zs. Podolyák, Zs. Dombradi, T. Isobe, Ayumi Yagi, C. J. Griffin, E. A. McCutchan, Oliver J. Roberts, H. Kanaoka, and F. G. Kondev

Subjects
Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Fission, 01 natural sciences, lcsh:QC1-999, Isotope separation, law.invention, Nuclear physics, law, 0103 physical sciences, Quasiparticle, Gammasphere, Neutron, 010306 general physics, Ground state, lcsh:Physics, Excitation
Abstract

The neutron-rich dysprosium isotopes ¹⁶⁸Dy₁₀₂ and ¹⁶⁹Dy₁₀₃ have been investigated using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity uranium beam in conjunction with isotope separation through the BigRIPS separator at RIBF in RIKEN Nishina Center. For ¹⁶⁸Dy, a previously unreported isomer with a half-life of 0.57(7) μs has been identified at an excitation energy of 1378 keV, and its presence affirmed independently using γ-γ-γ coincidence data taken with Gammasphere via two-proton transfer from an enriched ¹⁷⁰Er target performed at Argonne National Laboratory. This isomer is assigned Jπ = Kπ = (4⁻) based on the measured transition strengths, decay patterns, and the energy systematics for two-quasiparticle states in N = 102 isotones. The underlying mechanism of two-quasiparticle excitations in the doubly midshell region is discussed in comparison with the deformed QRPA and multi-quasiparticle calculations. In ¹⁶⁹Dy, the B(E2) value for the transition de-exciting the previously unreported Kπ = (1/2⁻) isomeric state at 166 keV to the Kπ = (5/2⁻) ground state is approximately two orders of magnitude larger than the E2 strength for the corresponding isomeric-decay transition in the N = 103 isotone ¹⁷³Yb, suggesting the presence of a significant γ-vibrational admixture with a dominant neutron one-quasiparticle component in the isomeric state.

Published
2019
Full Text
View/download PDF

10. Collectivity of neutron-rich Cr and Fe toward N=50

Author

Hidetada Baba, Tohru Motobayashi, Jenny Lee, Yuya Kubota, A. Delbart, Shuichi Ota, R. Lozeva, T. Sumikama, E. Sahin, K. Hadynska-Klek, David Steppenbeck, A. Gottardo, M. Lettmann, C. M. Shand, E. C. Pollacco, S. Nishimura, R. Taniuchi, Alessandra Corsi, Satoshi Takeuchi, Zena Patel, Pieter Doornenbal, V. Lapoux, C. Santamaria, V. Werner, F. Nowacki, S. Franchoo, C. Louchart, Z. Korkulu, Norbert Pietralla, J.-Y. Roussé, Tadaaki Isobe, Zs. Vajta, Daisuke Suzuki, Satoru Momiyama, M. Matsushita, A. Gillibert, Megumi Niikura, Jin Wu, L. X. Chung, P. A. Söderström, Tomohiro Uesaka, Zhengyu Xu, Alan Peyaud, T. Miyazaki, H. Wang, D. Calvet, A. Obertelli, Masaki Sasano, F. Giacoppo, C. Péron, G. Authelet, J. M. Gheller, Hiroyoshi Sakurai, F. Browne, Shoko Koyama, L. Olivier, Zs. Dombradi, F. Château, Hideaki Otsu, I. Stefan, K. Yoneda, K. Matsui, and Yoshiaki Shiga

Subjects
Physics, Nuclear reaction, Isotopes of uranium, 010308 nuclear & particles physics, Island of inversion, Fission, QC1-999, 7. Clean energy, 01 natural sciences, Engineering physics, Uranium-238, Excited state, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Spectrograph
Abstract

Within the SEASTAR project at RIKEN-RIBF, 66 Cr and 70,72 Fe have been produced via protonknockout reactions, and their first excited 2+ and 4+ states have been discovered. The combination of the liquid-hydrogen target and TPC system MINOS has been used in combination with the DALI2 detector array for the first time. A 345 MeV/u 238 U beam with a mean intensity of about 12 pnA impinged on a Be target. Fission fragments were separated and identified using the BigRIPS spectrograph, and reaction products were analyzed using the ZeroDegree spectrograph. A plateau of excitation energies, with a small change in the systematic trends past N = 44, reveals an extension of the N = 40 region of collectivity toward N = 50. Hence, the isotopes of interest are located within the N = 40 island of inversion. An interpretation of the observed trends is offered through large scale shell model calculations.

Published
2016

11. Particle-core coupling in 37S

Author

Zs. Dombradi, L. Corradi, Alick Deacon, F. Nowacki, Z. M. Wang, A. M. Stefanini, D. R. Napoli, A. Gadea, E. Caurier, A. Papenberg, David O'Donnell, Suzana Szilner, A. Hodsdon, M. Burns, X. Liang, B. R. Behera, N. Mǎrginean, R. Chapman, S. Lunardi, M. Trotta, E. Farnea, J. F. Smith, Fernando Scarlassara, G. Simpson, F. Ibrahim, F. Azaiez, F. Haas, G. Pollarolo, M. Stanoiu, D. Verney, M. Bouhelal, J. Ollier, A. Jungclaus, M. D. Salsac, G. Montagnoli, D. Curien, E. Fioretto, K. Keyes, V. Kumar, K. M. Spohr, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Hungarian Scientific Research Fund, Ministerio de Economía y Competitividad (España), Laboratori Nazionali di Legnaro, Engineering and Physical Sciences Research Council (UK), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Coupling, Physics, Nuclear and High Energy Physics, transfer reaction, particle-core coupling, Spectrometer, 010308 nuclear & particles physics, Context (language use), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Ion, Excited state, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Multiplet, Excitation
Abstract

R. Chapman et al. ; 8 págs.; 6 figs.; 2 tabs., Excited states of the neutron-rich N=21 S37 nucleus have been studied using binary grazing reactions produced by the interaction of a 215-MeV beam of S36 ions with a thin Pb208 target. The magnetic spectrometer, PRISMA, and the γ-ray array, CLARA, were used in the measurements. The level scheme of S37 was established to an excitation energy of 4196 keV and a number of new transitions were observed, in particular that corresponding to the decay of the proposed Jπ=(11/2-) level at an excitation energy of 2776 keV. The structure of the state is discussed within the context of state-of-the-art shell-model calculations using the SDPF-U effective interaction; the main component of the wave function corresponds to the coupling of the odd 1f7/2 neutron to the first 2+ state of the S36 core. The electromagnetic decay properties of the state are discussed within the context of a particle-core coupling model and the shell model. The other members of the multiplet of states are also discussed. ©2016 American Physical Society, We would like to thank the technical staff of the INFN Legnaro National Laboratory for their support during this experiment. This work was supported by the EPSRC (U.K). Four of us (A.H,M.B, K.L.K., and A.P.) would like to acknowledge the receipt of financial support from EPSRC during the course of this work. A.J. would like to acknowledge support from the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2014-57196-C5-4-P. Z.D. acknowledges financial support from OTKA Grant No. K100835.

Published
2016
Full Text
View/download PDF

12. 'beta'-decay studies of neutron-rich 'TL', 'PB', and 'BI' isotopes

Author

D. Bazzacco, R. Menegazzo, T. Engert, S. Klupp, Enrique Casarejos, I. Kojouharov, S. Pietri, R. Nicolini, O. Wieland, Zs. Dombradi, A. Algora, M. Górska, T.P.D. Swan, J. J. Valiente-Dobón, A. Y. Deo, J. Benlliure, H. Geissel, A. Gottardo, M. Bowry, Philip M Walker, Dirk Rudolph, F. Farinon, Alison Bruce, W. Prokopowicz, C. Domingo-Pardo, H. J. Wollersheim, H. Weick, B. Sitar, F. Naqvi, J. Grebosz, P. Strmen, H. Schaffner, M. L. Cortés, G. F. Farrelly, Zs. Podolyák, J. Gerl, A. Gadea, D. Mengoni, Roberto Vicençotto Ribas, N. Alkhomashi, I. Szarka, M. Bunce, E. Sahin, N. Kurz, M. Doncel, T. Habermann, C. A. Ur, A. I. Morales, R. Janik, Yassid Ayyad, F. Recchia, D. R. Napoli, B. Million, E. Gregor, K. Steiger, Matthew Reed, F. C. L. Crespi, M. Pfützner, E. Farnea, N. Al-Dahan, G. Benzoni, A. Sharma, Robert Hoischen, A. M. Denis Bacelar, N. Blasi, A. Bracco, G. de Angelis, A. Corsi, C. Nociforo, P. Boutachkov, A. Prochazka, K. Eppinger, Davinder Siwal, S. Leoni, P. R P Allegro, J. Alcántara Núñez, S.K. Mandal, N. Goel, F. Camera, S. Lunardi, and P. H. Regan

Subjects
Physics, Nuclear and High Energy Physics, Isotope, SHELL model, chemistry.chemical_element, Uranium, Beta decay, relativistic projectile fragmentation, RISING spectrometer, Ionizing radiation, Nuclear physics, chemistry, SPIN, Double beta decay, Subatomic Physics, r-process, Neutron, beta decay, Atomic physics
Abstract

The fragmentation of relativistic uranium projectiles has been exploited at the Gesellschaft fur Schwerionenforschung laboratory to investigate the β decay of neutron-rich nuclei just beyond 208Pb. This paper reports on β-delayed γ decays of 211-213Tl, 215Pb, and 215-219Bi de-exciting states in the daughters 211-213Pb, 215Bi, and 215-219Po. The resulting partial level schemes, proposed with the help of systematics and shell-model calculations, are presented. The role of allowed Gamow-Teller and first-forbidden β transitions in this mass region is discussed. © 2014 American Physical Society.

Published
2014

13. New μs Isomers in the Neutron-rich 210Hg Nucleus

Author

Robert Hoischen, H. Schaffner, S. Klupp, A. M. Denis Bacelar, P. Strmen, D. Bazzacco, A. Corsi, A. Algora, A. Gadea, F. Farinon, G. Benzoni, E. Sahin, E. Farnea, T. Habermann, N. Al-Dahan, N. Alkhomashi, Roberto Vicençotto Ribas, A. Y. Deo, Davinder Siwal, N. Kurz, A. Bracco, R. Menegazzo, D. Mengoni, I. Szarka, M. Górska, P.R. John, M. Doncel, M. Bunce, A. Prochazka, Dirk Rudolph, F. Naqvi, J. Grebosz, K. Eppinger, O. Wieland, H. J. Wollersheim, H. Weick, Matthew Reed, S. Pietri, C. A. Ur, S.K. Mandal, Zs. Dombradi, A. Sharma, T. Engert, K. Steiger, P. R P Allegro, G. F. Farrelly, S. Lunardi, J. Alcántara Núñez, S. Leoni, B. Sitar, F. Camera, Zs. Podolyák, J. Gerl, P. H. Regan, J. Benlliure, G. de Angelis, Alison Bruce, C. Nociforo, P. Boutachkov, A. Gottardo, W. Prokopowicz, V. Modamio, Enrique Casarejos, I. Kojouharov, R. Nicolini, C. Domingo-Pardo, M. L. Cortés, T.P.D. Swan, F. C. L. Crespi, M. Pfützner, Philip M Walker, B. Million, F. Recchia, D. R. Napoli, E. Gregor, N. Goel, S. M. Lenzi, A. I. Morales, R. Janik, Yassid Ayyad, J. J. Valiente-Dobón, H. Geissel, and M. Bowry

Subjects
Physics, Nuclear and High Energy Physics, Isotope, chemistry.chemical_element, Uranium, medicine.anatomical_structure, chemistry, Fragmentation (mass spectrometry), Subatomic Physics, medicine, Neutron, Atomic physics, Nucleus, Excitation
Abstract

Neutron-rich nuclei in the lead region, beyond N = 126, have been studied at the FRS-RISING setup at GSI, exploiting the fragmentation of a primary uranium beam. Two isomeric states have been identified in Hg-210: the 8(+) isomer expected from the seniority scheme in the vg(9/2) shell and a second one at low spin and low excitation energy. The decay strength of the 8(+) isomer confirms the need of effective three-body forces in the case of neutron-rich lead isotopes. The other unexpected low-lying isomer has been tentatively assigned as a 3(-) state, although this is in contrast with theoretical expectations. (C) 2013 Elsevier B.V. All rights reserved.

Published
2013

14. Isomeric decay studies in neutron-rich N ≈ 126 nuclei

Author

D. L. Balabanski, Alison Bruce, A. Kelic, I. J. Cullen, Fernando Montes, K. H. Maier, J. Jolie, F. Becker, A. B. Garnsworthy, Alexander Brown, S. J. Steer, W. Gelletly, M. Górska, W. Prokopowicz, I. Kojouharov, H. J. Wollersheim, G. Ilie, S. Lalkovski, A. Jungclaus, M. E. Estevez, G. Benzoni, Piotr Bednarczyk, H. Schaffner, Dirk Rudolph, P. Doornenbal, Z. Liu, T. Shizuma, S. Pietri, J. Grbosz, Robert Hoischen, L. Caceres, W. N. Catford, M. Kmiecik, M. Pfützner, T. Saito, R. Krücken, N. Kurz, F. G. Kondev, E. Werner-Malento, G. A. Jones, P. H. Regan, Philip M Walker, Zs. Dombradi, Andreas Martin Heinz, C. Brandau, O. Wieland, T. Kurtukian-Nieto, S. Myalski, G. F. Farrelly, Zs. Podolyák, A. Maj, J. Gerl, Hans Geissel, S. Schwertel, Stanislav Tashenov, and H. Grawe

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Fragmentation (mass spectrometry), Relativistic energy, Nuclear Theory, General Physics and Astronomy, Neutron, Atomic physics, Nuclear Experiment, Open shell
Abstract

Heavy neutron-rich nuclei were populated via relativistic energy fragmentation of a E / A = 1 GeV 208 Pb beam. The nuclei of interest were selected and identified by a fragment separator and then implanted in a passive plastic stopper. Delayed γ rays following internal isomeric decays were detected by the RISING array. Experimental information was obtained on a number of nuclei with Z = 73-80 ( Ta - Hg ), providing new information both on the prolate-oblate transitional region as well as on the N = 126 closed shell nuclei.

Published
2009

15. Single-particle behavior atN=126: Isomeric decays in neutron-richPt204

Author

W. Gelletly, H. J. Wollersheim, S. Myalski, W. N. Catford, Stanislav Tashenov, J. Jolie, K. H. Maier, I. Kojouharov, T. Saito, Andreas Martin Heinz, L. Caceres, S. Pietri, Zs. Podolyák, J. Gerl, A. Jungclaus, Piotr Bednarczyk, G. Benzoni, B. A. Brown, M. E. Estevez, M. Pfuetzner, Dirk Rudolph, O. Wieland, T. Kurtukian-Nieto, P. Doornenbal, C. Brandau, M. Górska, S. J. Steer, J. Greabosz, W. Prokopowicz, N. Kurz, M. Kmiecik, F. G. Kondev, R. Kruecken, P. H. Regan, A. B. Garnsworthy, A. Maj, Zs. Dombradi, E. Werner-Malento, H. Schaffner, Alison Bruce, A. Kelic, D. L. Balabanski, I. J. Cullen, Fernando Montes, G. Ilie, Z. Liu, Robert Hoischen, Hans Geissel, S. Schwertel, F. Becker, H. Grawe, Philip M Walker, T. Shizuma, S. Lalkovski, and G. A. Jones

Subjects
Physics, Nuclear and High Energy Physics, Angular momentum, medicine.anatomical_structure, Excited state, Yrast, Nuclear structure, medicine, r-process, Neutron, Atomic physics, Two-body problem, Nucleus
Abstract

The four proton-hole nucleus Pt-204 was populated in the fragmentation of an E/A = 1 GeV Pb-208 beam. The yrast structure of Pt-204 has been observed up to angular momentum I = 10h by detecting delayed gamma-ray transitions originating from metastable states. These long-lived excited states have been identified to have spin-parities of I-pi = (10(+)), (7(-)), and (5(-)) and half-lives of T-1/2 = 146(14) ns, 55(3) mu s, and 5.5(7) mu s, respectively. The structure of the magic N = 126 Pt-204 nucleus is discussed and understood in terms of the spherical shell model. The data suggest a revision of the two-body interaction for N = 126, Z < 82, which determines the evolution of nuclear structure toward the r-process waiting point nuclei.

Published
2008
Full Text
View/download PDF

16. First Results from the Stopped RISING Campaign at GSI: The Mapping of Isomeric Decays in Highly Exotic Nuclei

Author

S. Lalkovski, Hans Geissel, AJ Simons, Stanislav Tashenov, Andreas Martin Heinz, S. J. Steer, W. Prokopowicz, S. Schwertel, D. L. Balabanski, A. Jungclaus, B. Blank, E. Estevez, W. Gelletly, H. J. Wollersheim, S. Pietri, A. B. Garnsworthy, P. H. Regan, A. Blazhev, L. Caceres, Zs. Dombradi, T. Shizuma, G. Benzoni, L. Atanasova, Jason I. Brown, F. G. Kondev, Robert Hoischen, Piotr Bednarczyk, I. Kojouharov, T. Saito, G. Ilie, H. Schaffner, Claes Fahlander, J. Jolie, E. Werner-Malento, Zs. Podolyák, F. Camera, Emma Johansson, J. Gerl, P. Doornenbal, G. A. Jones, N. Kurz, M. Pfützner, M. Górska, Philip M Walker, O. Wieland, T. Kurtukian-Nieto, M. Kmiecik, Dirk Rudolph, Alison Bruce, A. Kelic, J. Grebosz, Lise-Lotte Andersson, C. Brandau, H. Grawe, A. Maj, Margareta Hellström, S. Myalski, W. N. Catford, I. J. Cullen, Fernando Montes, F. Becker, Z. Liu, and M. A. Bentley

Subjects
Nuclear reaction, Physics, Nuclear physics, Proton, Nuclear Theory, Hadron, Nuclear structure, Federal republic of germany, Neutron, Nuclear Experiment, Nucleon, Radioactive decay
Abstract

The first results from the Stopped Beam RISING experimental campaign performed at the GSI laboratory in Darmstadt, Germany, are presented. RISING (Rare ISotope INvestigations at GSI) constitutes a major new experimental program in European nuclear structure physics research aimed at using relativistic‐energy, projectile‐fragmentation reactions to study nuclei with exotic proton‐to‐neutron ratios. This paper introduces the physics aims of the Stopped RISING collaboration and presents some technical details and initial results from experiments using the RISING array to study decays from metastable nuclear states in both proton and neutron‐rich nuclei.

Published
2007
Full Text
View/download PDF

17. Intruder configurations in neutron-rich P and S isotopes

Author

D. Verney, Zs. Dombradi, A. M. Stefanini, D. Bazzacco, A. Hodsdon, Alick Deacon, A. G. Smith, M. Trotta, B. R. Behera, A. Jungclaus, F. Azaiez, F. Ibrahim, A. Papenberg, S. Lunardi, M. Labiche, T. Martinez, Fernando Scarlassara, M. Stanoiu, L. Corradi, S. Beghini, R. Chapman, J. Ollier, G. de Angelis, A. Gadea, K. M. Spohr, A. Latina, J. F. Smith, F. Haas, M. Davison, Th. Kröll, E. Farnea, D. R. Napoli, K. Keyes, G. Montagnoli, M. Axiotis, M. Burns, X. Liang, D. Curien, N. Marginean, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire 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), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Isotope, 010308 nuclear & particles physics, Yrast, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Ion, Neutron spectroscopy, Highly sensitive, Nuclear physics, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Spectroscopy, Nuclear Experiment
Abstract

NESTER; Neutron-rich sdf-shell nuclei have attracted a great deal of international interest, both theoretically and experimentally. There is an increasing interest in using deep-inelastic reactions to obtain spectroscopic information about these exotic nuclei. New results obtained from two such experiments are presented here. The highly sensitive GASP array was used to measure the $\gamma$ decays of previously unobserved yrast and near yrast states of $^{34}$P which were populated when 230 MeV $^{36}$S ions were incident on a thick target of $^{176}$Yb. In addition, a recent investigation of the spectroscopy of neutron-rich P and S isotopes has been undertaken with 215 MeV $^{36}$S ions incident on a thin target of $^{208}$Pb using the CLARA Ge detector array in conjunction with the PRISMA magnetic spectrometer. Preliminary results from this experiment are presented here.

Published
2005
Full Text
View/download PDF

18. N=14 and 16 shell gaps in neutron-rich oxygen isotopes

Author

A. D. Yamamoto, F. Becker, F. Azaiez, F. Negoita, Yu. G. Sobolev, A. Krasznahorkay, C. Borcea, J. C. Angélique, S. Leenhardt, F. De Oliveira-Santos, O. Sorlin, Z. Dlouhý, B. A. Brown, F. Pougheon, W. Mittig, G. Sletten, P. Mayet, C. Stodel, Yu. E. Penionzhkevich, C. Donzaud, J. Duprat, János Timár, Marie-Geneviève Porquet, D. Guillemaud-Mueller, M. G. Saint Laurent, Andras Kerek, Dóra Sohler, Zs. Fülöp, Zs. Dombradi, S. K. Mandal, P. Roussel-Chomaz, M. Belleguic, C. Bourgeois, S. Grévy, Zs. Podolyák, M. Stanoiu, A. Bracco, H. van der Marel, M. Lewitowicz, S. M. Lukyanov, J. Mrazek, J. M. Daugas, N. L. Achouri, H. Savajols, M. J. Lopez-Jimenez, F. Ibrahim, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), 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), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 23.20.Lv, 21.60.Cs, 27.20.+n, 27.30.+t, Astrophysics::High Energy Astrophysical Phenomena, SHELL model, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Isotopes of oxygen, Fragmentation (mass spectrometry), Excited state, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Spectroscopy, Nuclear Experiment
Abstract

In-beam gamma-ray spectroscopy using fragmentation reactions of both stable and radioactive beams has been performed in order to study the structure of excited states in neutron-rich oxygen isotopes with masses ranging from A=20 to 24. For the produced fragments, gamma-ray energies, intensities, and gamma-gamma coincidences have been measured. Based on this information new level schemes are proposed for O-21,O-22 up to the neutron separation energy. The nonobservation of any gamma-decay branch from O-23 and O-24 suggests that their excited states lie above the neutron decay thresholds. From this, as well as from the level schemes proposed for O-21 and O-22, the size of the N=14 and 16 shell gaps in oxygen isotopes is discussed in the light of shell-model calculations.

Published
2004
Full Text
View/download PDF

19. Inelastic proton scattering on 16C

Author

T. Gomi, S. Kawai, A. Saito, Masahiro Notani, Kazuyoshi Kurita, Hiroyoshi Sakurai, Hidetada Baba, Y. Togano, Zs. Dombradi, T. Minemura, Satoshi Takeuchi, M. Tamaki, S. Michimasa, T. Kubo, Masakazu Ishihara, Nobuaki Imai, H. Hasegawa, S. Kanno, Y. Matsuyama, Zs. Fülöp, Kenichiro Yoneda, K. Yamada, Shinsuke Ota, Hooi Jin Ong, Yoshiyuki Yanagisawa, K. Demichi, Z. Elekes, Tohru Motobayashi, J. Gibelin, H. K. Sakai, E. Takeshita, S. Shimoura, H. Iwasaki, and Nori Aoi

Subjects
Physics, History, Proton, 010308 nuclear & particles physics, Nuclear Theory, Deformation (meteorology), Inelastic scattering, 01 natural sciences, Inelastic neutron scattering, Computer Science Applications, Education, 0103 physical sciences, Quadrupole, Physics::Accelerator Physics, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Beam (structure)
Abstract

We have studied the 2 1 + state in neutron-rich {sr16}C via inelastic proton scattering in inverse kinematics, using a 33 MeV/nucleon beam. From the angle-integrated cross-section, the deformation parameter β pp′ = 0.50(8) is obtained. This value is greater than the deformation parameter deduced from the lifetime measurement. With these two result combined, the ratio of the neutron and proton quadrupole matrix elements is deduced to be approximately 7, indicating a neutron-dominant quadrupole collectivity in 16C

Published
2006
Full Text
View/download PDF

20. Inelastic proton scattering on 16C

Author

Nobuaki Imai, M. Tamaki, J. Gibelin, S. Michimasa, T. Minemura, Shinsuke Ota, Satoshi Takeuchi, Kenichiro Yoneda, A. Saito, H. Hasegawa, Y. Togano, Z. Elekes, Hooi Jin Ong, S. Kawai, E. Takeshita, Hiroyoshi Sakurai, Masakazu Ishihara, Y. Matsuyama, Nori Aoi, Zs. Fülöp, Masahiro Notani, Zs. Dombradi, Hidetada Baba, S. Kanno, H. K. Sakai, K. Yamada, S. Shimoura, Tohru Motobayashi, Kazuyoshi Kurita, H. Iwasaki, T. Kubo, Yoshiyuki Yanagisawa, K. Demichi, T. Gomi, 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), C. Gross, W. Nazarewicz, and K. Rykaczewski

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, γ transitions and level energies, Nuclear Theory, Hadron, 25.40.Ep, 23.20.Lv, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Inelastic scattering, 01 natural sciences, Inelastic neutron scattering, Nuclear physics, 0103 physical sciences, Quadrupole, Physics::Accelerator Physics, Nuclear fusion, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Inelastic proton scattering
Abstract

NESTER; We have studied the 2+1 state in neutron-rich 16Cvia inelastic proton scattering in inverse kinematics, using a 33 MeV/nucleon beam. From the angle-integrated cross-section, the deformation parameter βpp' = 0.50(8) is obtained. This value is greater than the deformation parameter deduced from the lifetime measurement. With these two result combined, the ratio of the neutron and proton quadrupole matrix elements is deduced to be approximately 7, indicating a neutron-dominant quadrupole collectivity in 16C.

Published
2005
Full Text
View/download PDF

21. Isomers in neutron-rich lead isotopes populated via the fragmentation of238U at 1 GeV A

Author

Enrique Casarejos, Robert Hoischen, I. Kojouharov, R. Nicolini, A. M. Denis Bacelar, N. Kurz, P. Strmen, R. Menegazzo, Davinder Siwal, H. J. Wollersheim, G. F. Farrelly, G. Benzoni, F. Naqvi, Roberto Vicençotto Ribas, H. Weick, C. Domingo-Pardo, Zs. Podolyák, J. Gerl, N. Goel, R. Janik, N. Alkhomashi, M. Bunce, A. Gottardo, Yassid Ayyad, S. Pietri, A. Prochazka, P. R P Allegro, J. Grebosz, E. Sahin, Zs. Dombradi, Dirk Rudolph, B. Sitar, L. Cortes, F. Camera, T.P.D. Swan, G. de Angelis, Philip M Walker, H. Schaffner, F. Recchia, J. Alcántara Núñez, A. Gadea, M. Górska, D. R. Napoli, S. Leoni, J. J. Valiente-Dobón, F. Farinon, O. Wieland, S.K. Mandal, B. Million, J. Benlliure, T. Engert, Alison Bruce, S. Klupp, S. Lunardi, H. Geissel, M. Bowry, A. Algora, W. Prokopowicz, P. H. Regan, A. Y. Deo, E. Gregor, A. Corsi, K. Steger, A. Sharma, C. Nociforo, P. Boutachkov, F. C. L. Crespi, M. Pfützner, A. Bracco, K. Eppinger, M. Doncel, D. Mengoni, I. Szarka, N. Al-Dahan, Matthew Reed, and T. Haberman

Subjects
Nuclear reaction, History, Isotopes of uranium, Chemistry, Nuclear Theory, Hadron, Nuclear structure, Computer Science Applications, Education, Nuclear physics, Uranium-238, Physics::Atomic and Molecular Clusters, Neutron, Nuclear Experiment, Nucleon, Radioactive decay
Abstract

Neutron-rich nuclei beyond N = 126 in the lead region were populated by fragmenting a 238U beam at 1 GeV A on a Be target and then separated by the Fragment Separator (FRS) at GSI. Their isomeric decays were observed, enabling study of the shell structure of neutron-rich nuclei around the Z=82 shell closure. Some preliminary results are reported in this paper.

Published
2011
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results