Description of the Giant Monopole Resonance in the Even-A Sn-112 - Sn-124 Isotopes within the Microscopic Model  Including Quasiparticle-Phonon Coupling.

Avdeenkov, A; Krewald, S.; Litvinova, E.; Lyutorovich, N.; GrÜmmer, F.; Speth, J.; Kamerdzhiev, S.; Tselyaev, V.

doi:10.1103/PhysRevC.79.034309

Journal Article

Description of the Giant Monopole Resonance in the Even-A Sn-112 - Sn-124 Isotopes within the Microscopic Model Including Quasiparticle-Phonon Coupling.

Avdeenkov, A. ; GrÜmmer, F. ; Kamerdzhiev, S. ; Krewald, S.FZJ* ; Litvinova, E. ; Lyutorovich, N. ; Speth, J.FZJ* ; Tselyaev, V.

2009
Inst. Woodbury, NY

Physical review / C 79(3), 034309 (2009) [10.1103/PhysRevC.79.034309]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10452 doi:10.1103/PhysRevC.79.034309

Abstract: 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.

Keyword(s): J

Classification:

Physics, Nuclear

Note: V. T. thanks the staff of the Institut fur Kernphysik at the Forschungszentrum Julich for their hospitality during the completion of this work. This work was supported by the Deutsche Forschungsgemeinschaft under Grant No. 436 RUS 113/806/0-1 and by the Russian Foundation for Basic Research under Grant No. 05-02-04005-DFG_a. V. T., E. L., and N.L. acknowledge financial support from the Russian Federal Agency of Education under Project No. 2.1.1/4779.

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