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Abstract: We have investigated the isoscalar giant resonances in the Sn isotopes usinginelastic scattering of 386-MeV alpha-particles at extremely forward angles,including 0deg. We have obtained completely -background-freeinelastic-scattering spectra for the Sn isotopes over the angular range0deg-9deg and up to an excitation energy of 31.5 MeV. The strengthdistributions for various multipoles were extracted by a multipoledecomposition analysis based on the expected angular distributions of therespective multipoles. We find that the centroid energies of the isoscalargiant monopole resonance ISGMR in the Sn isotopes are significantly lowerthan the theoretical predictions. In addition, based on the ISGMR results, avalue of K {tau} = -550 \pm 100 MeV is obtained for the asymmetry term in thenuclear incompressibility. Constraints on interactions employed in nuclearstructure calculations are discussed on the basis of theexperimentally-obtained values for K infty and K tau.



Autor: T. Li, U. Garg, et al

Fuente: https://arxiv.org/







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