Eur. Phys. J. Plus (2021) 136: 22
https://doi.org/10.1140/epjp/s13360-020-00974-9

Regular Article

A detailed study of nuclear structure of odd-mass Pm isotopes near N = 82 shell closure

¹ Department of Physics and Astronomical Sciences, Central University of Jammu, 181143, Samba, J&K, India
² Higher Education Department, Government of Jammu and Kashmir, Srinagar, J&K, India
³ Department of Physics, University of Jammu, 180001, Jammu, India
⁴ Department of Physics, University of Kashmir, 190001, Srinagar, J&K, India

^c suramsingh@gmail.com

Received: 3 August 2020
Accepted: 28 November 2020
Published online: 3 January 2021

Abstract

A systematic study of the positive as well as negative parity yrast structure for the odd-mass ^145−149Pm isotopes is carried out by using the angular momentum projection technique implemented in the projected shell model (PSM). By assuming an axial symmetry in the deformed basis, we have been able to calculate the yrast states up to a maximum spin of 47/2 for both positive and negative parity, and as a result, a good agreement is obtained with available experimental data for all isotopes. The intrinsic structure of positive and negative parity yrast states has been found to be built on πg_7/2$\otimes$νh_11/2 and πh_11/2$\otimes$νh_11/2 configurations, respectively. The phenomenon of back-bending has also been discussed in the present work. Reduced electric and magnetic transitions probabilities [B(E2) and B(M1)] are also calculated using the PSM wave functions. Since experimental data on B(E2) and B(M1) are not available, these results can serve as motivation for experimentalists to look for these data. However, the theoretical values of transition strength ratio B(M1)/B(E2) have been found to be matching excellently with the experimental ones.