Pygmy dipole response of proton rich argon beyond the random phase approximation

Details Pygmy dipole response of proton rich argon beyond the random phase approximation Pygmy dipole response of proton rich argon beyond the random phase approximation

2007-12-19

arxiv.org/abs/0712.3254v1

Physics

Nuclear Physics

Nuclear Theory

Submitted to Phys. Rev. C

Scientific paper

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.

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