期刊
PHYSICS LETTERS B
卷 763, 期 -, 页码 108-113出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2016.10.020
关键词
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资金
- National Science Foundation (NSF) [PHY-1102511, PHY-1350234]
- Department of Energy National Nuclear Security Administration (NNSA) [DE-NA0002132, DE-NA0003221]
- Department of Energy National Nuclear Security Administration (NNSA) through the Nuclear Science and Security Consortium [DE-NA0000979, DE-NA0003180]
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC-06CH11357, DE-FG02-94ER40834, DE-FG02-96ER40983]
- U.S. Army Research Laboratory [W911NF-12-2-0019]
Shape coexistence near closed-shell nuclei, whereby states associated with deformed shapes appear at relatively low excitation energy alongside spherical ones, is indicative of the rapid change in structure that can occur with the addition or removal of a few protons or neutrons. Near Ni-68 (Z = 28, N = 40), the identification of shape coexistence hinges on hitherto undetermined transition rates to and from low-energy 0(+) states. In Ni-68,Ni-70, new lifetimes and branching ratios have been measured. These data enable quantitative descriptions of the 0(+) states through the deduced transition rates and serve as sensitive probes for characterizing their nuclear wave functions. The results are compared to, and consistent with, large-scale shell-model calculations which predict shape coexistence. With the firm identification of this phenomenon near Ni-68, shape coexistence is now observed in all currently accessible regions of the nuclear chart with closed proton shells and mid-shell neutrons. (C) 2016 The Author(s). Published by Elsevier B.V.
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