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

A systematic study of the positive as well as negative parity yrast structure for the odd-mass Pm145-149 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 pi g(7/2)circle times nu h(11/2) and pi h(11/2)circle times nu h(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.

Automated summary

A systematic study of the positive and negative parity yrast structure for the odd-mass Pm145-149 isotopes was carried out using the angular momentum projection technique in the projected shell model. Good agreement with experimental data was obtained, and the results can motivate experimentalists to look for more data. Theoretical values of transition strength ratio B(M1)/B(E2) match excellently with experimental ones.