The photographic plate method has been used in an investigation of the neutrons from the reaction 3 7 Li + 1 2 D → 4 8 Be + 0 1 n. The results are in general agreement with those of Richards, but show the structure of the neutron groups more clearly. In particular, the shape of the broad group attributed by Richards to a level in 8 Be at 3.0 ± 0.4 MeV. is discussed in detail. The total energy release is 15.0 ± 0.15 MeV., and evidence is put forward for the existence of energy levels in 8 Be at 2.8 MeV., 4.05 MeV., 4.9 MeV., and 7.5 MeV.
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Green et al. (1949) studied this question.
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