Abstract
The doubly differential cross section for the production of $^{3}\mathrm{He}$ and $^{4}\mathrm{He}$ by 800 MeV protons from $^{12}\mathrm{C}$, Ti, and Pb has been measured at laboratory angles of 6\ifmmode^\circ\else\textdegree\fi{} and 15\ifmmode^\circ\else\textdegree\fi{}. The momentum of the detected helium nuclei varied from 1 to 2 GeV/c, the maximum being well above the incident proton momentum of 1.46 GeV/c. The cross sections were found to increase with increasing target mass and decrease with increasing momentum and scattering angle. In our momentum region, the $^{3}\mathrm{He}$ production cross section is 1.5--10 times larger than $^{4}\mathrm{He}$ depending on the target and the momentum. The data are consistent with the hypothesis that the dominant reaction mechanism is a direct process where the initial nucleon-nucleon scattering is followed by a sequential pickup of neutrons.
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