Polarization in p‐4He elastic scattering at intermediate energies

The symmetry in the elastic scattering of polarized protons from helium has been 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−1 (step size ∠0.1 fm−1). The beam polarization was approximately 70% and the beam intensity varied between 0.4–1.5 ×109 particles/burst. The polarization is found to depend sensitively on the beam momentum near q=2.2 fm−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.