High spin states in the doubly odd 72 Br nucleus

Abstract

States of 72Br were studied through the 58Ni(16O,np) reaction at E=40 to 55 MeV. From the excitation function, γ-ray angular distribution, γ−γ coincidence and decay measurements, γ rays depopulating states with probable spin values ranging up to I=(9) were found. An isomeric state of T12=10.3±0.6 sec, and Iπ=(1−) at 101.0 keV excitation energy was found. The observation of certain similarities with a recently reported band in 74Br suggests that the collective features seen in heavier Br isotopes may persist in 72Br.