High-spin structures of 88Kr and 89Rb: Evolution from collective to single-particle behaviors

TL;DR

This study investigates high-spin states of neutron-rich nuclei 88Kr and 89Rb, revealing a transition from collective to single-particle behaviors with increasing excitation energy, supported by experimental data and shell-model calculations.

Contribution

It provides detailed level schemes and spin-parity assignments for 88Kr and 89Rb, illustrating the evolution of nuclear structure from collective to single-particle regimes.

Findings

Level schemes show transition from collective to single-particle states.

Shell-model calculations identify specific proton and neutron configurations.

Experimental data support the evolution of nuclear structure with excitation energy.

Abstract

The high-spin states of the two neutron-rich nuclei, 88Kr and 89R have been studied from the 18O + 208Pb fusion-fission reaction. Their level schemes were built from triple gamma-ray coincidence data and gamma-gamma angular correlations were analyzed in order to assign spin and parity values to most of the observed states. The two levels schemes evolve from collective structures to single-particle excitations as a function of the excitation energy. Comparison with results of shell-model calculations gives the specific proton and neutron configurations which are involved to generate the angular momentum along the yrast lines.