出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：This work introduces a new treatment for the spallation reaction, which is the main mechanism for neutron generation in ADS reactors. These reactions are conventionally described by two coupled stages with different scales in time. First a rapid intranuclear cascade, followed by a slow particle evaporation process in competition with the fission process. The cascade phase was described by a time-dependent Multi-Collisional Monte Carlo (MCMC) numerical code, where many-particle system evolves in time along the cascade. This work introduces, in the cascade phase, a baryon effective mass, to better represent the effect of nuclear binding energy on the nucleon kinematics. We discuss the implications of the inclusion of this baryon effective mass to the evaporation phase, and to the particles production at the end of the whole reaction process. The diffusion of neutrons was analytically solved by improving the treatment presented in a recent work [1], by using two groups of energy. It is exhibited an analytical solution even using this more precise approximation. We explicitly show the dependence of the rector power on the neutron source current, and determines the power for different levels of subcritical operational regime of the reactor.
