A radiochemical study on the existence of dineutron |
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Authors: | K. Otozai T. Sekine R. Arakawa K. Hata T. Saito H. Baba |
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Affiliation: | 1. Department of Chemistry, Faculty of Science, Osaka University, Toyonaka, Osaka, Japan 2. Kobe Women's University, Suma, 654, Kobe, Japan 3. Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki, Japan 4. College of General Education, Osaka University, Toyonaka, 560, Osaka, Japan
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Abstract: | A radiochemical study has been made to search for dineutron2 n produced in the simultaneous two-neutron emission of the excited6He nuclei,6He*, induced in the reaction of9Be+n→-6He*+α with fast neutrons in a reactor. It was attempted to detect the radio-activity of28Mg as a product of the reaction2 n+27Al→28Mg+p. The28Mg radioactivity observed in heterogeneous samples composed of the2 n-producing target Be and the2 n-detecting target Al separately was not found to be more than that of a side reaction,27Al{(n, p)(n th, γ)+(n th, γ)(n, p)}28Mg, whereas it clearly exceeded that of the side reaction in alloy samples made of Be and Al metals. The former experiment gives an upper limit of the production rate of the dineutron in the bound state 1×10?7 per event of the simultaneous two-neutron emission. A tentative explanation for the excessive28Mg radioactivity observed in the latter experiment is the following two-step process,9Be+n→6He+α and27Al+6He→+28Mg+α+p, rather than the process induced by the dineutron in a virtual state. |
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