The study of the (α, α′ f) reaction at 120 MeV on 232Th and 238U: (II). Fission barrier properties deduced from fission probabilities and angular distributions |
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Authors: | J. Van Der Plicht M.N. Harakeh A. Van Der Woude P. David J. Debrus H. Janszen J. Schulze |
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Affiliation: | 1. Kernfysisch Versneller Instituut, Groningen, The Netherlands;2. Institut für Strahlen- und Kernphysik, Nussallee 14-16, D-5300 Bonn, West-Germany |
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Abstract: | The fission probabilities and angular distributions of the fission fragments for the (α, α'f) reaction on 232Th and 238U at a bombarding energy of 120 MeV have been measured from about 4 to 14 MeV excitation energy. Evidence for sub-barrier resonances has been found, the negativeparity ones occurring at the same excitation energy where photofission resonances have been observed. The data are analyzed with the two-humped barrier model. For 238U the data are reasonably well fitted with barriers similar to those known from the literature. For 232Th though, the outer barrier parameters are quite different: the height EB = 6.6 MeV and the width (khω)B = 1.2 MeV. Also for 232Th, introducing an additional mass symmetric and axially asymmetric outer barrier, as was previously found necessary for 238U, does not result in a good fit to the data at higher excitation energies. |
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Keywords: | Nuclear reactions fission |
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