期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.192502
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资金
- European Union Seventh Framework Programme through ENSAR [262010]
- QuantiXLie Centre of Excellence - European Regional Development Fund [KK.01.1.1.01.0004]
- Cohesion Fund from Ministry of Science and Technology of Croatia within the Operational Program Competitiveness and Cohesion
- Polish National Science Centre (NCN) [2016/22/M/ST2/00269]
- Natural Sciences and Engineering Research Council of Canada
- STFC [ST/G008787/1, ST/J000159/1, ST/L005670/1, ST/I504916/1, ST/P004598/1, ST/F004060/1, ST/P004423/1] Funding Source: UKRI
Lifetime measurements of excited states of the light N = 52 isotones Kr-88, Se-86, and Ge-84 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 84Ge. While the B(E2; 2(+)-> 0(+) ) values of Kr-88, Se-86 saturate the maximum quadrupole collectivity offered by the natural valence (3s, 2d, 1g(7/2), 1h(11/2)) space of an inert Ni-78 core, the value obtained for Ge-84 largely exceeds it, suggesting that shape coexistence phenomena, previously reported at N less than or similar to 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 rho field in shell-structure evolution.
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