ELASTIC-SCATTERING OF POLARIZED PROTONS FROM POLARIZED HE-3

A polarized He-3 gas target of 6.44 atm pressure has been used to meas ure beam- and target-related asymmetries, A(00N0) and A(000N), and spi n correlation parameters, A(00NN), for proton elastic scattering from He-3. Between 200 and 500 MeV, and in the range of momentum transfers q = 2 - 5.1 fm(-1), differences between A(000N) and A(00N0) are found which provide unambiguous evidence for a significant f amplitude in p- He-3 scattering even though this amplitude vanishes for the NN system. The new target-related observables are only in fair agreement with re sults of two model calculations based on a non-relativistic momentum s pace optical potential and on a nonrelativistic distorted wave Born ap proximation model.