Gamma-ray Spectroscopy Of Very Neutron-Deficient Bi Isotopes

摘要

Prompt and delayed γ rays from in ~(191,193)Bi have been identified using the recoil-decay tagging (RDT), isomer tagging, and recoil gating techniques, resulting in extensive level schemes for both nuclei. Excitation energies of the isomeric 13/2~+ states have been established and rotational bands based on them have been observed. The nearly spherical 9/2~-ground-state bands appear to be crossed by more deformed low-lying structures. TRS calculations have been performed and B(M1)/B(E2) ratios have been extracted for the observed strongly-coupled bands. In ~(193)Bi, a 3 μs isomer has been interpreted as a h_(9/2) proton coupled to the 12~+ state of the ~(192)Pb core.