Skyrme-Random-Phase-Approximation description of E1 strength in 92-100Mo

TL;DR

This paper analyzes the E1 strength in Mo isotopes using a self-consistent SRPA model with various Skyrme forces, focusing on low-energy regions relevant for astrophysics, and finds deformation effects are modest below 12 MeV.

Contribution

It applies the SRPA model with multiple Skyrme forces to systematically study E1 strength in Mo isotopes, emphasizing low-energy behavior near particle thresholds.

Findings

Deformation has a modest effect on E1 strength below 12 MeV.

Skyrme forces differ in giant resonance description but agree below 12 MeV.

E1 strength at 4-8 MeV is mainly from the tail of the giant resonance.

Abstract

The isovector dipole E1 strength in Mo isotopes with A=92,94,96,98,100 is analyzed within the self-consistent separable random-phase approximation (SRPA) model with Skyrme forces SkT6, SkM*, SLy6, and SkI3. The special attention is paid to the low-energy region near the particle thresholds (4-12 MeV), which is important for understanding of astrophysical processes. We show that, due to a compensation effect, the influence of nuclear deformation on E1 strength below 10-12 MeV is quite modest. At the same time, in agreement with previous predictions, the deformation increases the strength at higher energy. At 4-8 MeV the strength is mainly determined by the tail of E1 giant resonance. The four Skyrme forces differ in description of the whole giant resonance but give rather similar results below 12 MeV.