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Yield and angular distribution measurements on the T 3 (/>, 7)He 4 reaction have been made for protons up to 2.5 Mev. The yield indicates a resonance in the He 4 nucleus at a proton energy of about 2.5 Mev, giving an excited level at 21.6 Mev. The angular yield of the gamma-rays fits an A-\-B sin 2 # distribution very well, suggesting that the gamma-rays are due predominantly to a transition from the x Pi state to the 1 SQ state. An aluminum absorption curve for the secondaries produced in a lead radiator was taken, and a direct comparison made with the 17.5-Mev gamma-rays from the Li 7 (p, 7)Be 8 reaction, showing that the T 3 (/>, 7)He 4 gamma-rays are of higher energy.

Absolute values for the reaction cross section of Li 7 (p,n)Be 7 are given for proton energies between 1.86 Mev and 2.5 Mev. Detailed angular distributions and their analyses are presented and the use of the reaction as a variable energy neutron source is discussed. 373

The proton-triton differential scattering cross section has been measured for laboratory angles between 45° and 135° and proton energies between 0.7 and 2.5 Mev. In this angular range the scattering is predominantly nuclear and shows a rapid increase in intensity for angles greater than 90° in the center of mass system. Some indications of anomalous behavior near the threshold for T 3 (£,w)He 3 are reported.