Abstract
79–97 Rb and 121–146Cs isotopic cross sections from 238U fission induced by 1 GeV protons have been measured by means of a two-stage mass spectrometer on-line with the LNPI synchrocyclotron. The isotopic distributions of Rb and Cs for this proton energy were found to be considerably broadened compared with available data for E ⩽ 150 MeV and to have a double-humped shape. Comparison of the Rb and Cs isotopic distributions with data on mass correlations of complementary fragments confirms the connection between the nucleon composition (N/Z ratio) of the fragments and the loss of nucleons per fission event, and enables us to estimate their number. The study of the odd-even effect in the isotopic distributions of Rb and Cs shows that nuclear structure effects are much weaker for high-energy fission than for low-energy fission, in good agreement with the data of other workers.
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