Pre-equilibrium process in 3He-induced reactions on 59Co, 109Ag, 181Ta and 209Bi

Abstract

Abstract Excitation functions and mean projected recoil-ion ranges of radioactive nuclei produced in the 3 He-induced reactions were measured for the targets of 59 Co, 109 Ag, 181 Ta and 209 Bi. Most of the excitation functions showed characteristic features of the pre-equilibrium process. We proposed a new method, based on the hybrid model, for evaluation of the initial exciton number n 0 from the slope of excitation function for the reaction in which only a single neutron is emitted. With the deduced n 0 for ( 3 He, n) reaction, the observed excitation functions were compared with the theoretical calculations of the equilibrium and the pre-equilibrium model. The shape of the observed excitation functions for ( 3 He, n) reactions with four kinds of targets was compared and discussed in connection with the n 0 values.