Isomeric cross sections for the (n, 2n) reaction on 82Se, 81Br,and 45Sc at 15.1 MeV |
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Authors: | T.H. Kao W.L. Alford |
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Affiliation: | Physics Department, Auburn University, Auburn, Alabama 36830, USA |
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Abstract: | Activation techniques have been used to measure the cross sections at 15.1 MeV neutron energy for the following reactions: 82Se(n, 2n)81m+gSe, 81Br(n, 2n)80m+gBr, and 45Sc(n, 2n) 44m+gSc. Isomeric cross-section ratios were evaluated by applying the method of least squares to the time behavior of γ-ray activity following the ground-state decay of each isomeric pair. The absolute cross section σm for the formation of the metastable state was measured by the mixed-powder method with the 27Al(n, α)24Na reaction as the monitor. The cross section σg for the formation of the ground state was then determined by using the isomeric cross-section ratio. The sum of σm and σg for each reaction is compared with the theoretical value obtained from calculations based on the statistical model for the formation of a compound nucleus and its subsequent emission of neutrons. |
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Keywords: | Nuclear Reactions |
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