Excitation function measurements for the alpha induced reactions in indium

Excitation functions of the reactions (α,n), (α,2n), (α,3n), (α,4n), (α,pn), (α,2p), for 115In and (α,n), (α,2n) for 113In have been measured up to 50 MeV bombarding energy using stacked foil activation technique. The 100 cc Ge(Li) detector was used for detection of residual activity. Natural Indium (99.99%) has two odd mass stable isotopes of abundance, 113In (4.3%) and 115In (95.7%), their activation in some cases gives the same residual nucleus through different reaction channels, but with very different Q-values. The stack of the target foils was irradiated at the Variable Energy Cyclotron Center, Calcutta. The alpha particle flux was monitored by charge collection method using Faraday Cup kept just behind the targets. The cross-sections are measured at ten alpha particle energies. The experimental data are compared with the theoretical predictions calculated by considering equilibrium as well as pre-equilibrium reactions according to the geometry dependent hybrid model of Blann. Calculations were done using prior calculation method of ALICE/LIVERMORE-82 code. The theoretical excitation functions were calculated for exciton number no = 4 with the configuration (2n+2p+Oh). (author). 38 refs, 9 figs