CX. Inelastic scattering of 2·5 m e vneutrons by 54 Fe and 56 Fe

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Abstract
A NaI(Tl) crystal was used to study the gamma radiations emitted by natural iron, 54Fe, and 56Fe scatterers. Gamma rays of the following energies were observed: from natural iron 0·85±0·03, 1·22±0·05, 1·42±0·05 mev. The 1·4 mev gamma ray was not present with the 56Fe scatterer. A 1·37±0·05 mev line was observed with the 54Fe scatterer. In addition the neutrons scattered from natural iron were studied with a stilbene crystal, and groups corresponding to levels at 0·85±0·03 mev and 1·45±0·05 mev were found. On the basis of the above the following levels can be identified: in 56Fe 0·85±0·03 mev, 2·07±0·05 mev, in 54Fe 1·40±0·05 mev.