Abstract
Alpha particles produced by the interaction of 14 MeV neutrons with sodium have been studied with the help of Ilford 200 μm nuclear emulsion plates. The energy distributions of the alpha particles agree well with the predictions of the evaporation theory. The angular distributions are consistent with compound nucleus formation in the sense that it shows a symmetry about 90° as in the case of the As 75(n, α)Ga 72 reaction reported earlier. The relative level density calculated from the energy distribution of the alpha particles fits exactly a straight line corresponding to a Maxwellian distribution with a temperature of 1.55 MeV. The total (n, α) cross section is estimated to be 185 mb±15%.
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