2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/82968Particle production in equilibrium and nonequilibrium quantum systems is calculated. The effects of the off-shell propagation of nucleons in medium on the particle production are discussed. Comparision to the semiclassical production rate is given.talk given at the V Workshop on the Nonequilibrium Physics at Short Time Scales, April 1998, Rostock, Germany, 4 pagesNuclear Theorytext