Coulomb Form Factors of $^{27}$Al and $^{31}$P Nuclei Using Coulomb valance Tassie model and Bohr-Mottelson Collective Models with Different Potentials

TL;DR

This study investigates Coulomb form factors of $^{27}$Al and $^{31}$P nuclei using shell model calculations combined with Coulomb valence Tassie and Bohr-Mottelson collective models, comparing different potentials to experimental data.

Contribution

It introduces a comprehensive approach combining shell model, Coulomb valence Tassie, and Bohr-Mottelson models with various potentials to analyze nuclear form factors.

Findings

Core-polarization effects improve agreement with experimental data.

Different potentials yield comparable results, validating the models.

The combined approach effectively describes Coulomb form factors.

Abstract

The longitudinal Coulomb C0, C2 and C4 form factors with core-polarization effects have been studied using shell model calculations for 3/2$^+_1$ state with excitation energy of 1.069 MeV, 5/2$^+_2$ state with excitation energy of 2.706 MeV and 7/2$^+_1$ state with excitation energy of 2.304 MeV state in $^{27}$Al nucleus and 1/2 state in $^{31}$P nucleus. The two-body effective interaction Wildenthal and universal sd-shell interaction A (USDA) are used for sd-shell orbits. The Coulomb valance Tassie model (CVTM) and Bohr-Mottelson (BM) collective model have been used to calculated the Core-polarization effects. Three potentials are Harmonic Oscillator (HO) potential, Wood-Saxon (WS) and SKX potential,which have been used to calculated the wave functions of radial single particle matrix elements. The results for these potentials are compared with final update experimental data. The calculations with inclusions of core-polarization effects give a good agreements of experimental data.