Gradual loss of collectivity in rotational bands in N = 89 isotones

Abstract

In the present work, we investigate the general properties of low-lying experimental bands in three N = 89 isotones, 155 Dy (Z = 66), 156 Ho (Z = 67), 157 Er (Z = 68), at high spin within the cranked Nilsson-Strutinsky formalism. The excitation energies of the yrast bands have been compared with the experimental findings, and good agreements are observed. Our calculations show that with increasing total nuclear spin, the collectivity decreases gradually leading to the termination. In addition, nuclei with 10-12 particles outside the closed core terminate within configurations with no hole in the core.

General properties of terminating bands in the A = 110 and A = 160 mass regions

“…• To form the terminating states in both closed-core and broken-core configurations, ∼10-15 nucleons (particle+hole) contribute which is in agreement with [4,11]. It is also shown in our recent study [16].…”

“…In our earlier study, we investigated high spin properties in three N = 89 isotones ( 155 Dy, 156 Ho, 157 Er). Optimized counterparts were described for observed terminating bands well and Some similarity among them were introduced [16].…”