Ab initio description of Si, P, S, Cl and Ar isotopes in sd-shell

Abstract

In the present work, we have reported comprehensive study of the sd-shell nuclei in the range Z = 14 − 18 with neutron number varying from N = 9 to N = 20 using the microscopic effective valence shell interactions. These effective sd-shell interactions are developed using the ab initio nocore shell model wave functions and the Okubo-Lee-Suzuki transformation method. The valence shell effective interactions, which are used in this project, are N3LO, JISP16 and DJ16A interactions. For comparison, we have also performed shell model calculations with the empirical USDB interaction. Theoretically calculated shell model results are compared with the experimental data, to check the predictive strength of the microscopic interactions. It is found that the binding energies of the ground states are better reproduced with the DJ16A interaction as compared to other microscopic interactions. Spin-tensor decomposition of two-body interaction is presented to understand the contributions from central, vector and tensor components into these interactions. Electromagnetic properties of these isotopic chains have been studied. Spectroscopic strengths of 23 Al(d,n) 24 Si are calculated for the newly performed experiment at NSCL. The beta-decay properties of 32 Ar are also determined for recently available experimental data.

Analysis of Longitudinal Electroexcitation for Positive and Negative Parity States of 36,40Ar Nuclei Using Different Model Spaces

“…It is important and interesting to explore the properties of exotic nuclei both theory and experiment. Most of the nuclei are found to be deformed in their ground states [6,7,8]. The present study sheds some light not only on the structured positive parity states ( Ar isotopes, but also on the available negative parity states which denoted by ( Ar and 40 Ar isotopes.…”