Pygmy dipole response of proton-rich argon nuclei in random-phase approximation and no-core shell model
Articolo
Data di Pubblicazione:
2008
Citazione:
Pygmy dipole response of proton-rich argon nuclei in random-phase approximation and no-core shell model / C. Barbieri, E. Caurier, K. Langanke, G. Martinez-Pinedo. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 77:2(2008), pp. 024304.1-024304.7.
Abstract:
The occurrence of a pygmy dipole resonance in proton rich Ar32,34 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-particles-two-holes broadens the pygmy strength slightly and reduces sensibly its strength, as compared to the RPA predictions. For Ar32, a clear peak associated with a pygmy resonance is found. For Ar34, the pygmy states are obtained close to the giant dipole resonance and mix with it.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
resonance
Elenco autori:
C. Barbieri, E. Caurier, K. Langanke, G. Martinez-Pinedo
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