Pygmy dipole response of proton rich argon beyond the random phase approximation and no-core shell model - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review C Year : 2008

Pygmy dipole response of proton rich argon beyond the random phase approximation and no-core shell model

Abstract

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.

Dates and versions

in2p3-00202473 , version 1 (07-01-2008)

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Cite

C. Barbieri, E. Caurier, K. Langanke, G. Martínez-Pinedo. Pygmy dipole response of proton rich argon beyond the random phase approximation and no-core shell model. Physical Review C, 2008, 77, pp.024304. ⟨10.1103/PhysRevC.77.024304⟩. ⟨in2p3-00202473⟩
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