Abstract
Summary The small amounts of 4He, 3He, and 3H, produced in a block of steel bombarded with 340 mev protons have been isolated. Measurements have been made of the total helium by a gas-volumetric method, of the tritium by counting of the associated β-particles, and of the 3He: 4He ratioby mass-spectrometry. The ratio 4He: 3He: 3H has been found to be 1·00 : 0·048 : 0·078; this result is discussed in the light of Le Couteur's theory of nuclear evaporation.
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