B(E2) anomalies in the yrast band of Os-170

Abstract

Background: The neutron-deficient osmium isotopic chain provides a great laboratory for the study of shape evolution, with the transition from the soft triaxial rotor in (OS)-O-168 to the well-deformed prolate rotor in Os-18(0), while shape coexistence appears around N = 96 in Os-172. Therefore, the study of the Os isotopic chain should provide a better understanding of shape changes in nuclei and a detailed scrutiny of nuclear structure calculations. In this paper, the lifetimes of the low-lying yrast states of Os-170 have been measured for the first time to investigate the shape evolution with neutron number.