Description of the giant monopole resonance in the even-A Sn112-124 isotopes within a microscopic model including quasiparticle-phonon coupling

作者：Tselyaev V^*; Speth J; Krewald S; Litvinova E; Kamerdzhiev S; Lyutorovich N; Avdeenkov A; Gruemmer F

来源：Physical Review C, 2009, 79(3): 034309.

DOI：10.1103/PhysRevC.79.034309

We have calculated the strength distributions of the isoscalar giant monopole resonance (ISGMR) in the even-A tin isotopes (A=112-124) that were recently measured in inelastic alpha scattering. The calculations were performed within two microscopic models: the quasiparticle random phase approximation (QRPA) and the quasiparticle time blocking approximation (QTBA), which is an extension of the QRPA including quasiparticle-phonon coupling. We used a self-consistent calculational scheme based on the Hartree-Fock Bardeen-Cooper-Schrieffer approximation. Within the RPA the self-consistency is full. The single-particle continuum is also exactly included at the RPA level. The self-consistent mean field and the effective interaction are derived from the Skyrme energy functional. In the calculations, two Skyrme force parametrizations were used: T5 with a comparatively low value of the incompressibility modulus of infinite nuclear matter (K-infinity=202 MeV) and T6 with K-infinity=236 MeV. The T5 parametrization gives theoretical results for tin isotopes in good agreement with the experimental data including the resonance widths. The results of the ISGMR calculations in Zr-90, Sm-144, and Pb-208 performed with these Skyrme forces are discussed and compared with the experiment.

• 出版日期2009-3