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.

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