ELASTIC-SCATTERING CROSS-SECTIONS FOR THE ANALYSIS OF HELIUM BY H-1 BACKSCATTERING AND HYDROGEN BY HE-4 ERD

Elastic scattering cross sections for the analysis of helium by proton backscattering have been determined in the energy region 1.6-2.7 MeV. The measurements were performed at laboratory angles of 110 degrees-1 60 degrees. For the analysis of hydrogen by elastic recoil detection ( ERD), the scattering cross sections for H-1 recoils by He-4 ion bombar dment for energies 6.4-10.8 MeV at recoil angles of 28 degrees-8 degre es have been calculated by kinematically reversing the backscattering process. The helium target was prepared by implanting 60 keV He-4 ions into a thin tantalum foil. The helium concentration in the target was determined by 10 MeV Si-28 ion transmission ERD analysis. The obtaine d systematic cross section data are compared with the scarce literatur e values available. (C) 1998 Elsevier Science B.V.