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Physical Review C 77 (2008) 024304
Pygmy dipole response of proton rich argon beyond the random phase approximation and no-core shell model
C. Barbieri1, E. Caurier2, K. Langanke1, 3, G. Martínez-Pinedo1

The occurrence of a pygmy dipole resonance in proton rich Ar-32 and Ar-34 is studied using the unitary correlator operator method interaction Vucom, based on Argonne V18. Predictions from the random phase approximation (RPA) and the shell model in a no-core basis are compared. It is found that the inclusion of configuration mixing up to two-particle--two-holes broadens the pygmy strength slightly and reduces sensibly its strength, as compared to the RPA predictions. For Ar-32 a clear peak associated with a pygmy resonance is found. For Ar-34, the pygmy states are obtained close to the giant dipole resonance and mix with it.
1 :  GSI - Gesellschaft für Schwerionenforschung mbH
2 :  DRS-IPHC - Département Recherches Subatomiques
3 :  Institut für Kernphysik
Physique/Physique Nucléaire Théorique
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