An experimental study of mass asymmetry in subbarrier photofission of 238U |
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Authors: | A. Alm T. Kivikas |
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Affiliation: | Department of Physics, University of Lund, Sölvegatan 14, S-223 62 Lund, Sweden |
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Abstract: | A measurement of symmetric and asymmetric photofission yields of238U in the energy region from 4.5 MeV to 6.5 MeV has been performed. As γ-source the bremsstrahlung from a microtron has been used. The fission yields are obtained from β-counting of chemically separated isotopes 111Ag, 115Cd and 117Cd for symmetric fission and 139Ba for asymmetric fission. Some structures in the yield curves at about 5.3 MeV and a pronounced maximum at about 6.0 MeV in the valley-to-peak ratio in the fission fragment yield distribution are observed. It is suggested that these effects are connected with the double-hump fission barrier concept and indicate differences between fission barriers for symmetric and asymmetric fission. |
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Keywords: | Nuclear fission |
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