Abstract
Coincidence studies with silicon surface barrier detectors have been used to determine fragment kinetic energies, angular correlations and fission cross sections in the fission of Ag,139La,159Tb and U nuclei induced by 600 MeV protons. Symmetric mass distributions are deduced for Ag and Tb, whereas La shows an indication of a stable asymmetric mass distribution. We find no indication of the Businaro-Gallone point. Fission-spallation competition calculations are used to deduce values of macroscopic fission barrier heights and nuclear level density parameter values at deformations corresponding to the saddle point shapes. We find macroscopic fission barriers lower than those predicted by macroscopic theories. The total kinetic energies at symmetric mass divisions follow closely the Viola prediction.
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We are indebted to several members of the ISOLDE collaboration at CERN for help on numerous occasions and to the synchrocyclotron staff for the excellent beam quality achieved. The many useful discussions with B. Forkman, T. Ericson, P. Möller, J.R. Nix and S.G. Nilsson are gratefully acknowledged. The work has been supported by the Swedish Natural Science Research Council and by the Norwegian Research Council for Science and the Humanities.
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Andersson, G., Areskoug, M., Gustafsson, H.Å. et al. Medium energy proton induced fission in Tb, La and Ag. Z Physik A 293, 241–251 (1979). https://doi.org/10.1007/BF01435593
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DOI: https://doi.org/10.1007/BF01435593