PRODUCTION OF RESIDUAL NUCLEI BY ALPHA-INDUCED REACTIONS ON C, N, O, MG, AL AND SI UP TO 170 MEV

In order to provide thin-target cross sections as a basis for model ca lculations of the interactions of solar and galactic alpha-particles, irradiation experiments with alpha-particles were performed at the inj ector cyclotron at PSI/Villigen (E(max) = 119.7 MeV) and at the isochr onous cyclotron JULIC at KFA Julich (E(max) = 170.5 MeV). The stacked foil technique was used to investigate residual nuclide production fro m C, N, O, Mg, Al and Si. The product nuclides Be-7, Na-22, Na-24 and Mg-28 were measured by gamma-spectrometry, Be-10 and Al-26 by accelera tor mass spectrometry. The new data are compared with earlier measurem ents and analyzed using hybrid model of preequilibrium reactions.