期刊
NUCLEAR PHYSICS A
卷 689, 期 3-4, 页码 605-630出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0375-9474(00)00612-6
关键词
Cm-248(SF); measured E gamma, I gamma, gamma gamma-coincidence; Sr-96,Sr-97, Zr-98,Zr-99 deduced levels, J,pi; Sr-96,Sr-97,Sr-98,Sr-100, Zr-98,Zr-99 deduced quadrupole moments; EUROGAM2 array
The N = 58, 59 nuclei Sr-96.97 and Zr-98,Zr-99 produced in the spontaneous fission of Cm-248 were studied using the EUROGAM2 array. Regular rotational bands have been found in Sr-97 and Zr-99, firmly establishing shape coexistence in both nuclei. Contrary to earlier suggestions, no rotational bands were found on top of 0(3)(+) states in the N = 58 nuclei Sr-96 and Zr-98. It is likely, however. that the N = 58 nuclei undergo a shape change along the yrast line from spherical ground state to weakly deformed medium-spin states. Numerous single-particle excitations of negative parity, observed in S-97 and (99)[loc=pre]Zr, suggest the important role of the h(11/2) shell in creating deformation in these nuclei. Quadrupole moments were determined for rotational bands in the N = 58. 59, 60, 62 and 64 Sr and Zr nuclei. Deformation parameters, which increase gradually from beta (2) similar to 0.1 at N = 56, through beta (2) similar to 0.2 at N = 58 to beta (2) similar to 0.4 at N = 64, suggest that in strontium and zirconium isotopes the shape change happens gradually between N = 56 and N = 62, and is most likely due to an occupancy of three or more deformation-driving orbitals of h(11/2) parentage. (C) 2001 Elsevier Science B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据