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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.
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http://hal.in2p3.fr/in2p3-00202473
Contributor : Béatrice Forrler <>
Submitted on : Monday, January 7, 2008 - 10:23:05 AM
Last modification on : Tuesday, May 4, 2021 - 11:26:07 AM

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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, American Physical Society, 2008, 77, pp.024304. ⟨10.1103/PhysRevC.77.024304⟩. ⟨in2p3-00202473⟩

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