科研之友
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摘要
The decay of on-line mass-separated Rb-98 to Sr-98 is studied by gamma spectroscopy. The revised decay scheme adds further evidence of the coexistence of very different shapes in 98Sr. A set of levels is proposed to originate from particle-hole pair excitations across the Z = 40 spherical cap in analogy with Sr-96. A deformed K = 3 band with probable even parity is built on a 7.1-ns isomer at 1838 keV. It is interpreted as a two-quasineutron excitation in accordance with a quantum Monte Carlo pairing calculation based on a deformed shell model. Configurations of the calculated lowest-lying two-quasiparticle levels confirm the importance of the [404]9/2 neutron orbital at the largest deformations in the neutron-rich A similar or equal to 100 region.
- 出版日期2002-2
