Polarization and Cross Section of Protons Scattered byHe3from 4 to 13 MeV

The polarization of protons elastically scattered by ${\mathrm{He}}^3$ has been measured at six proton energies between 4 and 13 MeV and center-of-mass angles from 59 to 110°. Additional measurements were made at 133° from 7 to 11 MeV and at 124° at 10.7 MeV. The main feature of the data is the large polarization occurring near 120° for all energies. The maximum polarization measured was +0.65±0.06 at 10.7 MeV and 124°. The maximum polarization measured at 4 MeV was +0.40±0.04 at 110°. Above 8.8 MeV the polarization in the vicinity of 80° is negative and as large as -0.21±0.03 at 12.8 MeV and 77°. The agreement with the 10-MeV measurements of Rosen and Brolley is good. New cross-section data between 4 and 10.8 MeV are also given.