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

Journal Article · Fri Feb 15 00:00:00 EST 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.024304· OSTI ID:21068109

Barbieri, C; Martinez-Pinedo, G ^[1]; Caurier, E ^[2]; Langanke, K ^[1]

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1. Gesellschaft fuer Schwerionenforschung Darmstadt, Planckstr. 1, D-64259 Darmstadt (Germany)
2. 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

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ARGON 32
ARGON 34
CONFIGURATION MIXING
DIPOLES
ENERGY LEVELS
NUCLEAR POTENTIAL
NUCLEAR STRUCTURE
PARTICLE-HOLE MODEL
PROTONS
RANDOM PHASE APPROXIMATION
RESONANCE
SHELL MODELS