Lifetime measurements on the compound nucleus 236U by means of the shadow effect |
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Authors: | P.E. Vorotnikov Yu.F. Gurtovenko E.Kh. Kisina V.O. Kordyukevich Yu.V. Melikov N.A. Morozov Yu.D. Otstavnov L.N. Syutkina A.F. Tulinov N.G. Chechenin |
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Affiliation: | 1. Institute of Nuclear Physics, Moscow State University, Moscow, USSR;2. Kurchatov Institute of Atomic Energy, Moscow, USSR |
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Abstract: | The lifetime of the 236U nucleus is measured in the range of excitation energies Ex = 6.7–11.5 MeV by a method based on the shadow (blocking) effect. The results obtained, as well as those of an earlier measurement of the lifetime for the 239U nucleus in the range Ex = 6.4–9.1 MeV, are compared with the results of calculations based on the level density ρ(Ex) in the Fermi-gas model and on the empirical level density ρ(E)x) calculated as a result of an analysis of(n, γ) and (n, n') cross sections. An increase of excitation energy produces a substantial reduction in the rate of decrease of the lifetime at Ex ? 7.5 MeV for both compound nuclei as compared to the theoretical dependence τ(ex). |
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Keywords: | Nuclear reactions |
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