Abstract
Mass-yield ratios of 77Ge and 77As from thermal and epi-Cd fissions, and of 77Ge and 166Dy 166Ho from thermal and epi-Sm fissions of 239Pu have been measured radiochemically. It was found that the epi-thermal fission yield of the 77-mass chain showed only a slight decrease, if any, compared with fission caused by thermal neutrons, while the epi-Sm fission yield of 166Dy 166Ho was found to be lowered by 30 per cent. The Ge(Li) γ-ray spectroscopic measurements confirmed previous results that no significant fluctuations in the mass-yield ratios of 85mKr, 91Sr 91mY, 92Sr, 97Nb 97Zr, 99mTc, 103Ru, 105Ru, 131I, 132Te 132I, 133I, 135I 135Xe, 140Ba 140La, 143Ce and 147Nd for both thermal to epi-Cd and thermal to epi-Sm fission of 239Pu were observed. These results, combined with the previous data on 72Zn, 112Pd and 115Cd, are consistent with theoretical proposals that suggest the existence of a symmetric and an asymmetric mode of fission.
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