Lifetime measurements of lowest states in the pi g(7/2) circle times nu h(11/2) rotational band in I-112

摘要

A differential- plunger device was used to measure the lifetimes of the lowest states in the pi g(7/2) circle times nu h(11/2) rotational band in doubly odd I-112 with the Ni-58(Ni-58, 3pn) reaction. A differential decay curve method was performed using the fully shifted and degraded gamma-ray intensity measurements as a function of target- to- degrader distance. The lifetimes of the lowest three states in the pi g(7/2) circle times nu h(11/2) band in I-112 were measured to be 124(30), 130(25), and = 6.5(5) ps, respectively. As the lifetimes of successive excited states in a rotational band are expected to decrease with increasing excitation energy, these measurements suggest that the order of the transitions in the established band in I-112 may need revising and that the state tentatively assigned to be (7(-)) may not belong to the rotational band.