Deformation-induced splitting of the monopole giant resonance in24Mg

J Kvasil,A Repko,V.O Nesterenko,P.-G Reinhard,W Kleinig,A Andreev,V Sargsyan,N Arsenyev,S Ershov,A Vdovin

doi:10.1051/epjconf/201610705003

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.

Highlights

The isoscalar giant monopole resonance (ISGMR) represents the main source of information on the nuclear incompressibility [1] and is a subject of intense studies during last decades, see the book [2] and recent reviews [3, 4]
ISGMR is coupled with the Kπ = 0+ branch of the isoscalar giant quadrupole resonance (ISGQR), which leads to a double-bump structure of the ISGMR [2]
They are compared with the experimental data from Research Center for Nuclear Physics (RCNP) [11] and TAMU (Texas A&M University) [11, 24]

Summary

Introduction

The isoscalar giant monopole resonance (ISGMR) represents the main source of information on the nuclear incompressibility [1] and is a subject of intense studies during last decades, see the book [2] and recent reviews [3, 4]. The strong deformation splitting of the isoscalar giant monopole resonance (ISGMR), recently observed in (α, α ) reaction in prolate 24Mg, is analyzed in the framework of the Skyrme quasiparticle randomphase-approximation (QRPA) approach with the Skyrme forces SkM*, SVbas and SkPδ. 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.

Results

Conclusion