Statistical Analysis of Preequilibriumα-Particle Spectra and Possible Local Heating

Abstract
It is shown that energy spectra of preequilibrium α-particle emission in Bi209+N14 reactions are reproduced well by the statistical formula of Ericson when nuclear temperature is treated as a parameter depending on the emission angle. The resultant temperature shows monotonical decrease with increasing angles, indicating the cooling-down process of the associated composite system.