Radiochemical measurements of 200-MeV proton-induced fission of 133Cs.

Abstract

Proton-induced fission of $^{133}\mathrm{Cs}$(${E}_{\mathrm{p}=200}$ MeV) was investigated radiochemically in order to deduce the relative amounts of symmetric and asymmetric fission from this system. Chemical separation of K, Ni, Cu, Zn, and As was performed in these studies. The radioactive products were analyzed using Ge(Li) \ensuremath{\gamma}-ray spectroscopy techniques. Cumulative yields of $^{42}\mathrm{K}$, $^{65}\mathrm{Ni}$, $^{66}\mathrm{Ni}$, $^{67}\mathrm{Cu}$, $^{72}\mathrm{Zn}$, and $^{77}\mathrm{As}$ were measured to be 132\ifmmode\pm\else\textpm\fi{}40, 245\ifmmode\pm\else\textpm\fi{}120, <168, 218\ifmmode\pm\else\textpm\fi{}50, 248\ifmmode\pm\else\textpm\fi{}148, and 198\ifmmode\pm\else\textpm\fi{}60 nb, respectively. If the results are cumulative yields of symmetric and asymmetric fission components, then the fission cross sections deduced from the average cumulative yields are 2.0\ifmmode\pm\else\textpm\fi{}1.3 and 2.7\ifmmode\pm\else\textpm\fi{}0.9\ensuremath{\mu}b, respectively, or a total fission cross section of 4.7\ifmmode\pm\else\textpm\fi{}1.6\ensuremath{\mu}b. Alternatively, these yields can be interpreted as being due to an admixture of fission events and the high mass tail of intermediate mass fragmentation processes.