Non-equilibrium effects in alpha-particle-induced reactions in light, medium and heavy nuclei up to 120 mev

Abstract

Alpha-particle-induced reactions on the target elements vanadium, niobium and holmium were investigated in the energy range from 10 to 120 MeV, using the foil stack activation technique and Ge(Li) gamma-ray spectroscopy. The excitation functions of six reactions of the (alpha, xn) type were studied, of which three reactions 51V(alpha, n)54Mn, 165Ho(alpha ,2n)167Tm and 165Ho(alpha ,4n)165Tm were measured for the first time in the energy range from 80 to 120 MeV. A preliminary theoretical comparison with the pre-equilibrium hybrid model was made using an initial exciton number of n0=4 (4p0h) and general agreement was found for all except the 51V(alpha , n) and 93Nb(alpha , n) reactions at high energies. © 1987 IOP Publishing Ltd.