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

摘要

The strong deformation splitting of the isoscalar giant monopole resonance (ISGMR), recently observed in (a, a') 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~δ. 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.