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Delafosse C, Verney D, Marević P, Gottardo A, Michelagnoli C, Lemasson A, Goasduff A, Ljungvall J, Clément E, Korichi A, De Angelis G, Andreoiu C, Babo M, Boso A, Didierjean F, Dudouet J, Franchoo S, Gadea A, Georgiev G, Ibrahim F, Jacquot B, Konstantinopoulos T, Lenzi SM, Maquart G, Matea I, Mengoni D, Napoli DR, Nikšić T, Olivier L, Pérez-Vidal RM, Portail C, Recchia F, Redon N, Siciliano M, Stefan I, Stezowski O, Vretenar D, Zielinska M, Barrientos D, Benzoni G, Birkenbach B, Boston AJ, Boston HC, Cederwall B, Charles L, Ciemala M, Collado J, Cullen DM, Désesquelles P, de France G, Domingo-Pardo C, Eberth J, González V, Harkness-Brennan LJ, Hess H, Judson DS, Jungclaus A, Korten W, Lefevre A, Legruel F, Menegazzo R, Million B, Nyberg J, Quintana B, Ralet D, Reiter P, Saillant F, Sanchis E, Theisen C, Valiente Dobon JJ. Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the ^{78}Ni Region: A Hint from Lifetime Measurements. Phys Rev Lett 2018; 121:192502. [PMID: 30468583 DOI: 10.1103/physrevlett.121.192502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 08/27/2018] [Indexed: 06/09/2023]
Abstract
Lifetime measurements of excited states of the light N=52 isotones ^{88}Kr, ^{86}Se, and ^{84}Ge have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities B(E2;2^{+}→0^{+}) and B(E2;4^{+}→2^{+}) were obtained for the first time for the hard-to-reach ^{84}Ge. While the B(E2;2^{+}→0^{+}) values of ^{88}Kr, ^{86}Se saturate the maximum quadrupole collectivity offered by the natural valence (3s, 2d, 1g_{7/2}, 1h_{11/2}) space of an inert ^{78}Ni core, the value obtained for ^{84}Ge largely exceeds it, suggesting that shape coexistence phenomena, previously reported at N≲49, extend beyond N=50. The onset of collectivity at Z=32 is understood as due to a pseudo-SU(3) organization of the proton single-particle sequence reflecting a clear manifestation of pseudospin symmetry. It is realized that the latter provides actually reliable guidance for understanding the observed proton and neutron single particle structure in the whole medium-mass region, from Ni to Sn, pointing towards the important role of the isovector-vector ρ field in shell-structure evolution.
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Affiliation(s)
- C Delafosse
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - D Verney
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - P Marević
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
- CEA, DAM, DIF, F-91297 Arpajon, France
| | - A Gottardo
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - C Michelagnoli
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - A Lemasson
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - A Goasduff
- Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - J Ljungvall
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - E Clément
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - A Korichi
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - G De Angelis
- Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - C Andreoiu
- Departement of Chemistry, Simon Fraser University, Burnaby, British Columbia, V5A S16, Canada
| | - M Babo
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - A Boso
- Departimento di Fisica e Astronomia, Università di Padova, and INFN, Sezione di Padova, I-35131 Padova, Italy
| | - F Didierjean
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - J Dudouet
- Université Lyon, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622, Villeurbanne, France
| | - S Franchoo
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - A Gadea
- IFIC, CSIC-Universitat Valencia, Apartado Oficial 22085, 46071 Valencia, Spain
| | - G Georgiev
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - F Ibrahim
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - B Jacquot
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - T Konstantinopoulos
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - S M Lenzi
- Departimento di Fisica e Astronomia, Università di Padova, and INFN, Sezione di Padova, I-35131 Padova, Italy
| | - G Maquart
- Université Lyon, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622, Villeurbanne, France
| | - I Matea
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - D Mengoni
- Departimento di Fisica e Astronomia, Università di Padova, and INFN, Sezione di Padova, I-35131 Padova, Italy
| | - D R Napoli
- Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - T Nikšić
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32, 10000 Zagreb, Croatia
| | - L Olivier
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - R M Pérez-Vidal
- IFIC, CSIC-Universitat Valencia, Apartado Oficial 22085, 46071 Valencia, Spain
| | - C Portail
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - F Recchia
- Departimento di Fisica e Astronomia, Università di Padova, and INFN, Sezione di Padova, I-35131 Padova, Italy
| | - N Redon
- Université Lyon, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622, Villeurbanne, France
| | - M Siciliano
- Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
| | - I Stefan
- Institut de Physique Nucléaire, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - O Stezowski
- Université Lyon, Université Lyon 1, CNRS/IN2P3, IPN-Lyon, F-69622, Villeurbanne, France
| | - D Vretenar
- Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32, 10000 Zagreb, Croatia
| | - M Zielinska
- CEA de Saclay, IRFU, F-91191 Gif-sur-Yvette, France
| | | | - G Benzoni
- INFN Sezione di Milano, I-20133 Milano, Italy
| | - B Birkenbach
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - A J Boston
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - H C Boston
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - B Cederwall
- Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - L Charles
- Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
| | - M Ciemala
- The Henryk Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342 Kraków, Poland
| | - J Collado
- Departamento de Ingeniería Electrónica, Universitat de Valencia, Burjassot, Valencia 46100, Spain
| | - D M Cullen
- Nuclear Physics Group, Schuster Laboratory, University of Manchester, Manchester, M13 9PL, United Kingdom
| | - P Désesquelles
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - G de France
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - C Domingo-Pardo
- IFIC, CSIC-Universitat Valencia, Apartado Oficial 22085, 46071 Valencia, Spain
| | - J Eberth
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - V González
- Departamento de Ingeniería Electrónica, Universitat de Valencia, Burjassot, Valencia 46100, Spain
| | - L J Harkness-Brennan
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - H Hess
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - D S Judson
- Oliver Lodge Laboratory, The University of Liverpool, Liverpool, L69 7ZE, United Kingdom
| | - A Jungclaus
- Instituto de Estructura de la Materia, CSIC, Madrid, E-28006 Madrid, Spain
| | - W Korten
- CEA de Saclay, IRFU, F-91191 Gif-sur-Yvette, France
| | - A Lefevre
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - F Legruel
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - R Menegazzo
- Departimento di Fisica e Astronomia, Università di Padova, and INFN, Sezione di Padova, I-35131 Padova, Italy
| | - B Million
- INFN Sezione di Milano, I-20133 Milano, Italy
| | - J Nyberg
- Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
| | - B Quintana
- Laboratorio de Radiaciones Ionizantes, Universidad de Salamanca, E-37008 Salamanca, Spain
| | - D Ralet
- CSNSM, CNRS-IN2P3, Université Paris-Sud, Université Paris-Saclay, F-91406 Orsay, France
| | - P Reiter
- Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany
| | - F Saillant
- Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Caen F-14076, France
| | - E Sanchis
- Departamento de Ingeniería Electrónica, Universitat de Valencia, Burjassot, Valencia 46100, Spain
| | - Ch Theisen
- CEA de Saclay, IRFU, F-91191 Gif-sur-Yvette, France
| | - J J Valiente Dobon
- Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
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