AbstractsPhysics

Absolute (p,xn) cross sections of Pb206 have been measured over the energy range 15 to 65 Mev for x = l, 2, 3, 4, 5, 6 and 7. Thin target and monitor foils were bombarded together by the internal beam of the 100 Mev McGill synchrocyclotron. Monitoring was based on the known (p,pn) cross section for C12. A 28-channel kicksorter, together with a NaI(Tl) crystal counter, was used to determine the yields of the several reaction products. Chemical separations were avoided in this way. Successive cross sections reached a maximum of the order of one barn.