Hydrogen Deuterium Nuclear Reaction Dynamics Theory

There are three isotopes of the element hydrogen: protium, deuterium and tritium. Protium has almost same mass with neutron. Fast neutrons coming into central collision with protium become thermal neutron via transfer energy to protium. The angular distribution of secondary neutrons is isotropic, when neutrons come into collision with protium with not so much high energy in center-of-mass system. The secondary neutrons have only forward scattering, transforming the center-of-mass system to lab system. Protium and deuterium have different anisotropic scattering characteristic at the elastically and inelastically scattered, and take different affected by the condition of transport calculation.The ~6Li(n, T) cross section shows a 1/v behaviors in the lower energy region. Study of the tritium breeding ratio (TBR) in thermonuclear systems is becoming very important. Detailed study of behaviors of neutrons in LiH and LiD systems is the important step of learning neutron slowing down. It is very important for us to improve precision in numerical calculations and have a good knowledge about nuclear reaction kinetics in the deuterium and protium systems.In this paper, studying the behavior of neutrons on the LiH, LiD systems in different temperature, analysis the effects on tritium breeding, we give the appropriate choose in group structure and weighting flux, when using NJOY to produce the multigroup cross sections.Unlike the neutron spectrum in LiD system, the neutron spectrum in LiH system affected by the condition of transport calculation, we would treat these as different way.