Equilibrium and pre-equilibrium studies in some alpha induced reactions on rhodium

Excitation functions of the reactions (alpha, 2n), (alpha, 3n), and (alpha, 4n) for Rh-103 have been measured with stacked foil activation technique for the projectile energies below 50 MeV alpha -particles. A large volume HPGe detector was used. The experimental data were compared with the calculated values obtained from the CASCADE code based on statistical model and ALICE-91 code based on Hybrid and Geometry Dependent Hybrid Models. It is found that the pre-equilibrium contribution is more pronounced in the high energy region of the excitation functions and the experimental data are explained only when the pro-equilibrium emission phenomenon is also taken into account along with the equilibrium decay. The percentage of pre-equilibrium fraction has also been calculated.