Deformation-induced splitting of the monopole giant resonance in 24Mg

TL;DR

This paper investigates how nuclear deformation causes splitting of the giant monopole resonance in magnesium-24 using QRPA calculations with various Skyrme forces, confirming the coupling with quadrupole resonance.

Contribution

It provides a detailed theoretical analysis of deformation-induced splitting of ISGMR in 24Mg using Skyrme QRPA, confirming the coupling mechanism.

Findings

Deformation causes splitting of ISGMR in 24Mg.

Low-energy E0-peak results from coupling with quadrupole resonance.

Results are consistent across different Skyrme forces.

Abstract

The strong deformation splitting of the isoscalar giant monopole resonance (ISGMR), recently observed in ($\alpha,\alpha'$) reaction in prolate $^{24}$Mg, is analyzed in the framework of the Skyrme quasiparticle random-phase-approximation (QRPA) approach with the Skyrme forces SkM*, SVbas and SkP$^{\delta}$. The calculations with these forces give close results and confirm that the low-energy E0-peak is caused by the deformation-induced coupling of ISGMR with the K=0 branch of the isoscalar giant quadrupole resonance.