ELASTIC-SCATTERING CROSS-SECTIONS FOR THE P-24 MEV( HE SYSTEM IN THE ENERGY REGION OF 1.4)

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 measur ements 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 17 0 degrees for proton energies of 2.7-6.0 MeV. The scattering cross sec tions 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 c oncentration was determined by transmission elastic recoil detection a nalysis employing 10 MeV Si-28 ions. The obtained cross section data a re compared with the available literature values. Differences up to 10 % are found in the values at the cross section curve maximum in compar ison to earlier data. (C) 1997 American Institute of Physics.