期刊
PHYSICAL REVIEW LETTERS
卷 118, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.162502
关键词
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资金
- Italian Istituto Nazionale di Fisica Nucleare
- Polish National Science Centre [2014/14/M/ST2/00738, 2013/08/M/ST2/00257]
- Interuniversity Attraction Poles Programme (IAP) via the Belgian Science Policy Office (BriX network) [P7/12]
- HPCI Strategic Program [hp150224]
- MEXT
- JICFuS
- Priority Issue (Elucidation of the fundamental laws and evolution of the universe) [hp160211]
- CNS-RIKEN joint project for large-scale nuclear structure calculations
- [23244049]
- [PN-II-RU-TE-2014-4-2003]
- [PNIII-IFA-CERN-RO-03-ISOLDE]
A search for shape isomers in the Ni-66 nucleus was performed, following old suggestions of various mean-field models and recent ones, based on state-of-the-art Monte Carlo shell model ( MCSM), all considering Ni-66 as the lightest nuclear system with shape isomerism. By employing the two-neutron transfer reaction induced by an O-18 beam on a Ni-64 target, at the sub-Coulomb barrier energy of 39 MeV, all three lowest-excited 0(+) states in 66Ni were populated and their gamma decay was observed by gamma-coincidence technique. The 0(+) states lifetimes were assessed with the plunger method, yielding for the 0(2)(+), 0(3)(+), and 0(4)(+) decay to the 2(1)(+) state the B(E2) values of 4.3, 0.1, and 0.2 Weisskopf units (W.u.), respectively. MCSM calculations correctly predict the existence of all three excited 0(+) states, pointing to the oblate, spherical, and prolate nature of the consecutive excitations. In addition, they account for the hindrance of the E2 decay from the prolate 0(4)(+) to the spherical 2(1)(+) state, although overestimating its value. This result makes 66Ni a unique nuclear system, apart from (236);U-238, in which a retarded. transition from a 0(+) deformed state to a spherical configuration is observed, resembling a shape-isomerlike behavior.
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