Measurement and analysis of isomeric cross section ratios in the reaction Nb93(α,2n)Tc95: Pre-equilibrium reaction mechanism

Abstract

Isomeric cross-section ratio and excitation functions have been measured for Nb93(α,2n)Tc95m+g reactions up to 120 MeV. The ratio and the excitation functions were interpreted in terms of the theoretical results obtained by two models COMPLET and STAPRE, which include preequilibrium effects. The experimental results were fairly well reproduced by the COMPLET calculations, which take into account the angular momentum removal in preequilibrium emission in an approximate way. Conversely, STAPRE calculations show a better agreement for isomeric ratio, but the experimental excitation function is underestimated by almost a factor of 2. © 2005 The American Physical Society.