Pygmy dipole response of proton-rich argon nuclei in random-phase approximation and no-core shell model
Journal Article
·
· Physical Review. C, Nuclear Physics
- Gesellschaft fuer Schwerionenforschung Darmstadt, Planckstr. 1, D-64259 Darmstadt (Germany)
- Institut de Recherches Subatomiques, Universite Louis Pasteur, F-67037 Strasbourg (France)
The occurrence of a pygmy dipole resonance in proton rich {sup 32,34}Ar is studied using the unitary correlator operator method interaction V{sub UCOM}, 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 {sup 32}Ar, a clear peak associated with a pygmy resonance is found. For {sup 34}Ar, the pygmy states are obtained close to the giant dipole resonance and mix with it.
- OSTI ID:
- 21068109
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 77, Issue 2; Other Information: DOI: 10.1103/PhysRevC.77.024304; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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