Statistical Analysis of Preequilibrium<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>-Particle Spectra and Possible Local Heating

Abstract

It is shown that energy spectra of preequilibrium $\ensuremath{\alpha}$-particle emission in $^{209}\mathrm{Bi}$+$^{14}\mathrm{N}$ 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.