Isoscalar giant resonances in the Sn nuclei and implications for the asymmetry term in the nuclear-matter incompressibility

Abstract

We have investigated the isoscalar giant resonances in the Sn isotopes using inelastic scattering of 386-MeV alpha-particles at extremely forward angles, including 0deg. We have obtained completely "background-free inelastic-scattering spectra for the Sn isotopes over the angular range 0deg--9deg and up to an excitation energy of 31.5 MeV. The strength distributions for various multipoles were extracted by a multipole decomposition analysis based on the expected angular distributions of the respective multipoles. We find that the centroid energies of the isoscalar giant monopole resonance (ISGMR) in the Sn isotopes are significantly lower than the theoretical predictions. In addition, based on the ISGMR results, a value of K_{tau} = -550 \pm 100 MeV is obtained for the asymmetry term in the nuclear incompressibility. Constraints on interactions employed in nuclear structure calculations are discussed on the basis of the experimentally-obtained values for K_(infty) and K_(tau).

Accepted for publication in Physical Review C. Minor revisions in text and labeling of figures

References in corpus (12)

• Neutron-Rich Nuclei in Heaven and Earth
• Nuclear symmetry energy probed by neutron skin thickness of nuclei
• Isotopic dependence of the giant monopole resonance in the even-A ^{112-124}Sn isotopes and the asymmetry term in nuclear incompressibility
• Higher-order effects on the incompressibility of isospin asymmetric nuclear matter
• Incompressibility of neutron-rich matter
• The Giant Monopole Resonance in the Sn Isotopes: Why is Tin so "Fluffy"?
• Why is Tin so soft?
• Microscopic linear response calculations based on the Skyrme functional plus the pairing contribution
• The role of superfluidity in nuclear incompressibilities
• The Giant Monopole Resonance in Pb isotopes
• Proton decay from the isoscalar giant dipole resonance in ${}^{58}$Ni
• Direct proton decay of the isoscalar giant dipole resonance in 208Pb

Cited by in corpus (10)

• Further explorations of Skyrme-Hartree-Fock-Bogoliubov mass formulas. XII: Stiffness and stability of neutron-star matter
• Building relativistic mean field models for finite nuclei and neutron stars
• Low-energy electric dipole response in 120Sn
• Giant Monopole Resonance in even-A Cd isotopes, the asymmetry term in nuclear incompressibility, and the "softness" of Sn and Cd nuclei
• A self-consistent study of multipole response in neutron-rich nuclei using a modified realistic potential
• Quasiparticle Random Phase Approximation with Interactions from the Similarity Renormalization Group
• Breathing-mode measurements in Sn isotopes and isospin dependence of nuclear incompressibility
• Excitation of Giant Monopole Resonance in ${}^{208}$Pb and ${}^{116}$Sn Using Inelastic Deuteron Scattering
• Effects of thermal shape fluctuations and pairing fluctuations on the giant dipole resonance in warm nuclei
• Nuclear breathing mode in neutron-rich Nickel isotopes: sensitivity to the symmetry energy and the role of the continuum