QUANTUM-STATISTICAL CORRELATIONS AND SINGLE-PARTICLE DISTRIBUTIONS FOR SLOWLY EXPANDING SYSTEMS WITH TEMPERATURE PROFILE

Competition among particle evaporation, temperature gradient, and flow is investigated in a phenomenological manner, based on a simultaneous analysis of quantum statistical correlations and momentum distributio ns for a nonrelativistic, spherically symmetric, three-dimensionally e xpanding, finite source. The parameters of the model emission function are constrained by fits to neutron and proton momentum distributions and correlation functions in intermediate-energy heavy-ion collisions. The temperature gradient is related to the momentum dependence of the radius parameters of the two-particle correlation function, as well a s to the momentum-dependent temperature parameter of the single partic le spectrum, while a long duration of particle evaporation is found to be responsible for the low relative momentum behavior of the two-part icle correlations.