Measurements of the polarization of protons from the ${\mathrm{B}}^{10}({\mathrm{He}}^3,p){\mathrm{C}}^{12*}$ (4.43 MeV) reaction have been extended to the ${\mathrm{He}}^3$ energy range from 1.75 to 2.25 MeV. The angular dependence was determined at 2.00 MeV for eight laboratory angles from 10° to 100°. In addition, measurements were made at 11 other selected angles at beam energies from 1.75 to 2.25 MeV. The results of these measurements along with previous results from measurements made at ${\mathrm{He}}^3$ energies of 2.50 and 2.80 MeV have made it possible to study the mechanism of this reaction from the energy dependence of the proton polarizations. The smooth energy dependence observed indicates that a direct interaction mechanism is predominant for this reaction in this energy range.

• Received 23 June 1966

DOI:https://doi.org/10.1103/PhysRev.155.1132