Elsevier, Physics Letters B, (748), p. 343-346, 2015
DOI: 10.1016/j.physletb.2015.07.021
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The isoscalar giant monopole resonance (ISGMR) strength distribution in $^{24}$Mg has been determined from background-free inelastic scattering of 386-MeV $α$ particles at extreme forward angles, including 0$^{∘}$. 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 $^{24}$Mg. ; Comment: 5 pages, 4 figures; to be published in Phys. Lett. B