Shape coexistence in 153Ho

TL;DR

This study investigates high-spin states in 153Ho using gamma-ray spectroscopy, revealing shape coexistence and refining the nuclear level scheme through experimental and theoretical analysis.

Contribution

It provides new insights into the shape coexistence phenomenon in 153Ho and updates the nuclear level scheme with additional and revised levels.

Findings

Evidence of shape coexistence in 153Ho.

Refined nuclear level scheme with new level assignments.

Comparison of experimental and theoretical lifetimes supports shape evolution.

Abstract

The high-spin states in 153Ho, have been studied by 139 57 La(20Ne, 6n) reaction at a projectile energy of 139 MeV at Variable Energy Cyclotron Centre (VECC), Kolkata, India, utilizing an earlier campaign of Indian National Gamma Array (INGA) setup. Data from gamma-gamma coincidence, directional correlation and polarization measurements have been analyzed to assign and confirm the spins and parities of the levels. We have suggested a few additions and revisions of the reported level scheme of 153Ho. The RF-gamma time difference spectra have been useful to confirm the half-life of an isomer in this nucleus. From the comparison of experimental and theoretical results, it is found that there are definite indications of shape coexistence in this nucleus. The experimental and calculated lifetimes of several isomers have been compared to follow the coexistence and evolution of shape with increasing spin.