Even- and Odd-Parity Band Structures in exp 125 Xe

摘要

The level structure of exp 125 Xe has been studied with the ( exp 3 He,3n gamma ) reaction on an enriched exp 125 Te target using in-beam gamma -ray spectroscopic methods. In addition to the negative-parity level structure, an extensive previously unknown positive-parity band structure based on different low-j states was observed. The odd-parity hsub(11/2) level system is well reproduced with the triaxial rotor model. However, the positive-parity band structure is qualitatively interpreted with a particle-plus-vibrating-core model. The observed gsub(7/2) band head at 295.9 keV is an isomeric state with a half-life of 140 +- 30 ns. (Atomindex citation 11:496116)