Splitting of ISGMR strength in the light-mass nucleus 24Mg due to ground-state deformation

The isoscalar giant monopole resonance (ISGMR) strength distribution in Mg-24 has been determined from background-free inelastic scattering of 386-MeV alpha particles at extreme forward angles, including 0 degrees The ISGMR strength distribution has been observed for the first time to have a two-peak structure in a light-mass nucleus. This splitting of ISGMR strength is explained well by microscopic theory in terms of the prolate deformation of the ground state of Mg-24. (C) 2015 The Authors. Published by Elsevier B.V.