Evidence for Coexisting Shapes through Lifetime Measurements in ^{98}Zr.

Autor: Singh P; Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France., Korten W; Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France., Hagen TW; Department of Physics, University of Oslo, Oslo N-0316, Norway., Görgen A; Department of Physics, University of Oslo, Oslo N-0316, Norway., Grente L; Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France., Salsac MD; Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France., Farget F; Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Boulevard Henri Becquerel, 14076 Caen, France., Clément E; Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Boulevard Henri Becquerel, 14076 Caen, France., de France G; Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Boulevard Henri Becquerel, 14076 Caen, France., Braunroth T; Institut für Kernphysik, Universität zu Köln, Köln D-50937, Germany., Bruyneel B; Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France., Celikovic I; Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Boulevard Henri Becquerel, 14076 Caen, France.; Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade 11000, Serbia., Delaune O; Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Boulevard Henri Becquerel, 14076 Caen, France., Dewald A; Institut für Kernphysik, Universität zu Köln, Köln D-50937, Germany., Dijon A; Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Boulevard Henri Becquerel, 14076 Caen, France., Delaroche JP; CEA, DAM, DIF, 91297 Arpajon, France., Girod M; CEA, DAM, DIF, 91297 Arpajon, France., Hackstein M; Institut für Kernphysik, Universität zu Köln, Köln D-50937, Germany., Jacquot B; Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Boulevard Henri Becquerel, 14076 Caen, France., Libert J; CEA, DAM, DIF, 91297 Arpajon, France., Litzinger J; Institut für Kernphysik, Universität zu Köln, Köln D-50937, Germany., Ljungvall J; CSNSM, IN2P3, Orsay 91405, France., Louchart C; Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France., Gottardo A; INFN, Laboratori Nazionali di Legnaro, Legnaro I-35020, Italy., Michelagnoli C; INFN, Laboratori Nazionali di Legnaro, Legnaro I-35020, Italy., Müller-Gatermann C; Institut für Kernphysik, Universität zu Köln, Köln D-50937, Germany., Napoli DR; INFN, Laboratori Nazionali di Legnaro, Legnaro I-35020, Italy., Otsuka T; Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.; Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku Tokyo 113-0033, Japan.; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.; Instituut voor Kern- en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium.; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA., Pillet N; CEA, DAM, DIF, 91297 Arpajon, France., Recchia F; Dipartimento di Fisica e Astronomia 'Galileo Galilei', Università degli Studi di Padova and INFN Padova, I-35131 Padova, Italy., Rother W; Institut für Kernphysik, Universität zu Köln, Köln D-50937, Germany., Sahin E; Department of Physics, University of Oslo, Oslo N-0316, Norway., Siem S; Department of Physics, University of Oslo, Oslo N-0316, Norway., Sulignano B; Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France., Togashi T; Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku Tokyo 113-0033, Japan., Tsunoda Y; Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku Tokyo 113-0033, Japan., Theisen C; Irfu, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France., Valiente-Dobon JJ; INFN, Laboratori Nazionali di Legnaro, Legnaro I-35020, Italy.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2018 Nov 09; Vol. 121 (19), pp. 192501.
DOI: 10.1103/PhysRevLett.121.192501
Abstrakt: The lifetimes of the first excited 2^{+}, 4^{+}, and 6^{+} states in ^{98}Zr were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in ^{98}Zr were populated using the fission reaction between a 6.2  MeV/u ^{238}U beam and a ^{9}Be target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2;2_{1}^{+}→0_{1}^{+}) value in ^{98}Zr, thereby confirming the very sudden onset of collectivity at N=60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.
Databáze: MEDLINE
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