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

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arxiv 1507.03639 v1 pith:UQZJ5QQX submitted 2015-07-13 nucl-ex nucl-th

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

Y. K. Gupta , U. Garg , J. T. Matta , D. Patel , T. Peach , J. Hoffman , K. Yoshida , M. Itoh
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M. Fujiwara K. Hara H. Hashimoto K. Nakanishi M. Yosoi H. Sakaguchi S. Terashima S. Kishi T. Murakami M. Uchida Y. Yasuda H. Akimune T. Kawabata M.N. Harakeh
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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 $\alpha$ particles at extreme forward angles, including 0$^{\circ}$. 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.

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