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Measurements of total cross sections for~He(3He, 2p)4He have been made for center-of-momentum energies between 80 keV and 1.1 MeV. A continuously recirculating differentially pumped gas target system was employed to minimize uncertainties in energy loss and straggling. A calorimetric device was used to integrate the beam current within the target gas. Proton angular distributions were measured at seven. energies. The measured cross-section factor, S(E), was fitted to a linear function of energy for E, & 500 keV: Sg, ) =Sp+Sp'E,where Sp= (5.0-+p'4) MeVb and Sp' = (-1. 8 +0.5) b. The formula S(E,m) =Sp+Sp'E, m+ 2Sp"E, mw ith Sp --5.2 MeVb, Sp' ---2.8 b, and Sp" --2.4 b MeV gives a good representation of S(E) over the entire range of energies studied here.

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