PRODUCTION OF RESIDUAL NUCLEI BY PROTON-INDUCED REACTIONS ON C, N, O,MG, AL AND SI

Cross sections for the production of residual nuclides by p-induced re actions are the basic nuclear quantities for an accurate modelling of the interaction of solar cosmic protons with matter. In a series of ir radiation experiments at the cyclotron of the Svedberg Laboratory/Univ ersity of Uppsala sixteen different target elements were investigated for proton energies up to 100 MeV in order to determine such thin-targ et excitation functions. Residual nuclides were measured by gamma-spec trometry and, in the case of Be-10 and Al-26, by accelerator mass spec trometry. Here, we report results for the light target elements C, N, O, Mg, Al, and Si including also new cross sections for the production of Be-10 and Al-26 from aluminum for p-energies between 100 MeV and 2 00 MeV. The latter were derived from targets irradiated earlier at the IPN Orsay. The new experimental data are compared with earlier work a nd analyzed in the framework of the hybrid model of preequilibrium rea ctions investigating several options with respect to the choice of nuc lear masses including also corrections for shell effects of nuclear ma sses and level densities.