Elastic scattering cross sections for the p+ He system in the energy region of 1.4-24 MeV

The elastic scattering cross sections for proton scattering from He-4 were determined in the proton energy region of 1.4-6.0 MeV. The measurements were performed at laboratory angles of 110 degrees-170 degrees for proton energies of 1.4-2.7 MeV and at angles of 140 degrees and 170 degrees for proton energies of 2.7-6.0 MeV. The scattering cross sections for H-1 recoils by He-4 ion bombardment for helium energies of 5.6-24 MeV at recoil angles of 4 degrees-28 degrees were calculated by kinematically reversing the reaction. The helium targets were prepared by implanting 60 keV He-4 ions into thin tantalum foils. The helium concentration was determined by transmission elastic recoil detection analysis employing 10 MeV Si-28 ions. The obtained cross section data are compared with the available literature values. Differences up to 10% are found in the values at the cross section curve maximum in comparison to earlier data. (C) 1997 American Institute of Physics.