Low-lying level structures in 162Lu
Abstract
The well-tested empirical two quasiparticle rotor model calculations are used to characterize low-lying isomers in the odd-odd nucleus 162Lu. Physically admissible 2qp bandheads are obtained to construct the low-energy level structure of the nucleus, assign spin-parity (Jπ), orbital configuration, and level energies (Ex), for the gs and the two reported isomers. The spin-parity and orbital configuration of the 1.5 min isomer are confirmed to be Jπ= 4-\π5/2+[402] 3/2-[521]\. Its level energy has been estimated to be Ex 62 keV. The 1.9 min isomer is characterized for the first time with Jπ= 6+\π9/2-[514] 3/2-[521]\ and energy Ex 157 keV. Based on these assignments, individual β-decay branches of gs and the two isomers to the daughter levels in 162Yb are proposed. The study is extended to neighboruing isotopes 164,166,168Lu. A short-lived isomer, tentatively proposed in a previous study of 164Lu, is identified as Jπ= 6+\π7/2+[404] 5/2+[402]\ with energy Ex 52 keV. The energy of the Jπ=3+ isomer in 168Lu, currently listed with large uncertainty, is deduced as Ex 100 keV significantly improving its value.
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