Be^9(n, 2n)Be^8 and Bn^<11>(n, α)Li^8(β)Be^8 Reactions by 14Mev Neutrons
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概要
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Be^9(n, 2n)Be^8 and Bn^<11>(n, α)Li^8(β)Be^8 reactions induced by 14Mev neutrons were studied by the method of beryllium and boron loaded nuclear emulsions. In the former reaction, the angular distributions of Be^8 nuclei were strongly peaked backward in the center-of-mass system, suggesting that the direct interaction of the incident neutrons with beryllium - an inelastic scattering process before second neutron emission and a pick-up process probably - had a major contribution to the reaction. The cross sections were measured as 0.18±0.07, 0.03±0.02, 0.11±0.04 and 0.05±0.03 barns for the 3, 5, 7.5 and more than 9Mev excited states of Be^8 respectively. When 0.17±0.03 barns was cited to the cross section with respect to its ground state, the total (n, 2n) cross section was estimated as 0.54±0.09 barns. The cross section of the latter reaction was measured as 35±7 millibarns in which the contribution of Be^8 in the ground state was not included. Most Li^8 nuclei were found to be left at the states lower than 2.5Mev in the reaction. The decaying rates of Li^8 to the Be^8 states of 3, 5 and more than 8Mev were about 75, 15 and 10% respectively and the mixing of the allowed transitions of such rates was consistent with the known β-spectrum of Li^8.
- 社団法人日本物理学会の論文
- 1959-05-05
著者
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Sakisaka Masakatsu
Department Of Nuclear Engineering Faculty Of Engineering Kyoto University
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Sakisaka Masakatsu
Department Of Physics Konan University
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