Quenching of photon decay in hot giant dipole resonances

Year: 1994

Authors: Smerzi A., Di Toro M., Brink D.M.

Autors Affiliation: Dipartimento di Fisica dell“Universitą di Catania, 57, Corso Italia, 95129 Catania, Italy; INFN, Laboratorio Nazionale del Sud, Catania, Italy; Dipartimento di Fisica, Universitą di Trento, 38050 Povo Trento, Italy

Abstract: The quenching of photon decays in giant dipole resonances (GDR) at high excitation energy (E*) is explained as due to the competition between gamma-ray and particle emission. This effect is related to a large increase of the GDR width with the temperature of the nucleus in presence of a pre-equilibrium mechanism that also tends to reduce the collective dipole strength. A saturation of the GDR width at high excitation energy cannot account for the experimental data. Limiting temperatures for the observation of GDR gamma-decays are deduced. The E*-dependence of photon yields above the GDR region is also discussed.

Journal/Review: PHYSICS LETTERS B

Volume: 320 (3-4)      Pages from: 216  to: 220

KeyWords: Excitation-energy Dependence; Collective Motion; Nuclei; Temperature; Width
DOI: 10.1016/0370-2693(94)90647-5

Citations: 24
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