Nuclear density of states for moving fused compound systems.

Abstract

The single-particle distribution function of moving fused compounds, with velocities of the order of a few tenths of the velocity of light, are calculated using the discrete spectrum of single-particle states of deformed nuclei. The polarization of single-particle momenta in the direction of flight is clearly brought out. Results are presented for [sup 40]Ca, [sup 64]Ni, [sup 71]As, and [sup 90]Zr. For small temperatures when the internal excitations are small, the nuclear level density varies as [ital E]([ital E][sup 2][minus][ital M][sup 2])[sup 1/2] where [ital E] is the total energy of the moving nuclei, and, as excitation increases, the internal degrees of freedom dominate and the level density [rho][similar to][ital e][sup [ital S]], where [ital S] is the entropy of the system, varies exponentially. The level densities thus calculated are used to evaluate light charged-particle emission from hot fused compounds in motion.