Thorium fission by 4.8 and 14 MeV neutrons |
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Authors: | E Pfeiffer |
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Institution: | 1. Physikalisches Institut der Universit?t Tübingen, Deutschland
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Abstract: | The fission of natural Thorium byE n =4.8 and 14.0 MeV neutrons has been investigated by measuring the kinetic energies of both fragments in surface barrier detectors. The fragments were detected forE n =14.0 MeV neutron energy at 90 ° to the neutron beam, forE n =4.8 MeV at 0 ° and 90 °. The results given are the distributions of mass and of energy correlative to the fragment mass, and the correlation between anisotropy and fragment mass atE n =4.8 MeV. The average total kinetic energy before prompt neutron emission atE n =4.8 and 14.0 MeV neutron energy has been found to be \(\overline {E_K^* } \) =170.47±0.03 and 168.1 ± 0.05 MeV respectively. Within the limits of statistical error the anisotropy atE n =4.8 MeV is independent of the fragment mass. The results are analysed in the framework of the Two-Mode-Fission-Hypothesis. It appears, that the behaviour of the kinetic energy is too complicated as to be well described by the Two-Mode-Fission-Hypothesis. Both the Cluster Model of fission and the Fragment Shell Theory are suited to reproduce qualitatively the observed energetics of fission. |
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