Retardation of Particle Evaporation from Excited Nuclear Systems Due to Thermal Expansion
J. Tõke, L. Pieńkowski, M. Houck, W. U. Schröder, L. G. Sobotka
Abstract
Particle evaporation rates from excited nuclear systems at equilibrium matter density are studied within the Harmonic-Interaction Fermi Gas Model (HIFGM) combined with Weisskopf's detailed balance approach. It is found that thermal expansion of a hot nucleus, as described quantitatively by HIFGM, leads to a significant retardation of particle emission, greatly extending the validity of Weisskopf's approach. The decay of such highly excited nuclei is strongly influenced by surface instabilities.
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