Polarization in p--/sup 4/He elastic scattering at intermediate energies. [1. 2 to 2. 0 GeV/c, asymmetry]

The asymmetry in the elastic scattering of polarized protons from helium was measured at beam momenta of 1.2, 1.5 and 2.0 GeV/c and in the interval of three-momentum transfer, q, region between 0.3 and 5.5 fm/sup -1/ (step size approximately 0.1 fm/sup -1/). The beam polarization was approximately 70 percent and the beam intensity varied between 0.4-1.5 x 10/sup 9/ particles/burst. The polarization is found to depend sensitively on the beam momentum near q = 2.2 fm/sup -1/, which is the region where single and double scattering display interference effects in elastic scattering. In the q region where triple scattering begins to be predominant, the polarization displays a change in slope.