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Fission of 232Th by reactor neutrons: Mass-yield curve

1963; Pergamon Press; Volume: 25; Issue: 5 Linguagem: Inglês

10.1016/0022-1902(63)80230-4

1878-1225

R.H. Iyer, C.K. Mathews, N. Ravindran, K. Rengan, D.V. Singh, M.V. Ramaniah, H. D. Sharma,

Nuclear reactor physics and engineering

Fission yields of thirty nuclides covering the mass region 77–156 have been determined for the fission of thorium-232 by neutrons from the swimming pool reactor “Apsara”, using radiochemical techniques. The mass-yield curve has the two familiar peaks at mass numbers 90 and 140. The maximum peak yield is about 8 per cent and minimum trough yield about 0·03 per cent. The yield data indicate the presence of a small third peak in the symmetric region of the mass-yield curve. The third peak is about 0·5 per cent of the total mass-yield curve, has a maximum to minimum ratio of about 2·4 and a half-width of about seventeen mass numbers. The data obtained have been compared with similar data in literature. The results are discussed in the light of two-mode-fission hypothesis.