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.
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.
Pygmy dipole response of proton-rich argon nuclei in random-phase approximation and no-core shell model
C. Barbieri;
2008
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.File | Dimensione | Formato | |
---|---|---|---|
PhysRevC_77_024304_2008.pdf
accesso aperto
Tipologia:
Publisher's version/PDF
Dimensione
403.54 kB
Formato
Adobe PDF
|
403.54 kB | Adobe PDF | Visualizza/Apri |
PygmyAr_Jan07fin.pdf
accesso aperto
Tipologia:
Post-print, accepted manuscript ecc. (versione accettata dall'editore)
Dimensione
238.94 kB
Formato
Adobe PDF
|
238.94 kB | Adobe PDF | Visualizza/Apri |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.