Lifetimes in ¹⁸¹Ir and ¹⁸⁷Au: Enhanced Deformation of the pi i_13/2 Intruder Orbital

摘要

Lifetimes have been measured in the pi h_9/2 (yrast) and pi i_13/2 (excited) bands in the nuclei ¹⁸¹Ir and ¹⁸⁷Au using the Recoil Distance Method (RDM). The results clearly indicate that the pi i_13/2 band exhibits an increased deformation over the pi h_9/2 band, in keeping with the premise that the delayed crossing in this band is due to enhanced quadrupole deformation.