Semi-empirical systematics of (n,3He) reaction cross-section at 14.6 and 20Â MeV

A new semi-empirical formula for the evaluation of (n,3He) reaction cross-sections at the energy of 14.6 and 20 MeV is presented. Formula was derived using the analytical expression for the evaluation of the 3He spectrum within the frame of pre-equilibrium exciton model. The systematics obtained is compared with the empirical formula for the (n,3He) reaction cross-section.