Mass yield curves in low-energy proton-induced fission of U7 U, U7 Np, Pu, Pu, Pu, 'Am, and 'Am were investigated in the energy range of 8 -32 MeV. The gross features of mass yield curves were compared either at the same excitation energy or for the same charge of the compound nucleus with different neutron number. The results are briefly discussed in terms of (1) the weighted mean mass number of the light and heavy asymmetric peak, (2) the FWHM of the heavier asymmetric peak, and (3) the peak-to-valley ratio.
Evaporation-residue excitation functions for 160 and 12C~-19VAu reactions were measured by means of the activation technique. The competition between evaporation and fission of the compound nuclei was studied by comparing the observed evaporationresidue data with the published fission excitation functions, A newly devised analysis was applied in order to deduce a fission barrier height at a specified angular momentum and determine the relevant fissioning nucleus as well. We found the fission barriers to be 8.2 MeV for the 211Fr nucleus at 16h and 8.2 MeV for the 2~ nucleus at 27h.
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