Elastic Scattering of Polarized Protons on Helium Three at 800 Mev.

A set of spin dependent parameters and cross sections has been measured for (')P-('3)He elastic scattering over the range of q .7 - 4.2 fm('-1). The experiment was done at the Los Alamos Meson Physics Facility (LAMPF) using the High Resolution Spectrometer (HRS) with a polarized proton beam at .8 GeV. The focal plane polarimeter of the HRS was used to determine the spin direction of the scattered proton. Since ('3)He is one of the simplest nuclei, (')P-('3)He scattering provides a very sensitive test of multiple scattering theories. The theoretical analysis was done by using two different wave functions for ('3)He as input to the multiple scattering theory. The theoretical calculations and experimental data together will give us useful information about nucleon -nucleon amplitudes and also help us to obtain a better understanding of the scattering process.