SEARCH FOR HEAVY-ELEMENTS IN MINERALS USING ACCELERATED IONS

Measurements of spartial distributions of elements Pt, Au, Pb in natur al minerals using nuclear reaction of accelerated heavy ions are repor ted, The experimental procedure is based on recording instant fission fragments f.f. and induced activity of compound nuclei produced in the reactions, Yields and angular distributions of f.f. were measured alo ng with alpha-particle yields at different ion energies, The de-exitat ion process for some compound nuclei was considered taking into accoun t fission and neutron-evaporation channels, Fission cross sections, an gular distributions and isotope yields are calculated and compared wit h experimental data for (C,f) and (C,xn) nuclear reactions, Spatial mi cro distributions of Pt and of some other elements in natural samples have been obtained using accelerated carbon ions.