MEASUREMENT AND ANALYSIS OF EXCITATION-FUNCTIONS FOR THE REACTIONS HO-165(ALPHA, XN) (X=1-3) IN THE ENERGY-RANGE APPROXIMATE-TO 10-40 MEV

Excitation functions for the reactions Ho-165(alpha,n)Tm-168, Ho-165(a lpha,2n)Tm-167 and Ho-165(alpha, 3n)Tm-166 have been measured in the e nergy range approximate to 10-40 MeV using the stacked foil activation technique and gamma ray spectroscopy. Excitation functions have also been calculated theoretically using the semi-classical pre-equilibrium as well as quantum mechanical statistical multistep models. The calcu lations have been performed using a consistent/global set of parameter s. A comparison of excitation functions with the semi-classical pre-eq uilibrium and quantum mechanical statistical multistep calculations is presented. Interesting trends in the pre-equilibrium fraction with pr ojectile energy have been observed.