Particle evaporation from semiclassical dynamics

Particle evaporation from excited nuclei is calculated with the Boltzmann-Uehling-Uhlenbeck equation, which is solved numerically using the test-particle method. If the collision integral is omitted, the resulting Vlasov dynamics is very sensitive to numerical noise inherent in the test-particle method. With the collision integral included, the numerical error can be reduced to a point where the system reaches a steady state of evaporative decay. The evaporation rate is found to be consistent with the Weisskopf statistical formula. © 1996 The American Physical Society.