No abstract

We have measured the spin-transfer parameters K«, KsL, KLs, and Kss at 788 MeV from 47 to 177' c.m. , and also uncovered a 10 -16 /o normalization discrepancy which affects all previous np elastic spin data from LAMPF. Results disagree significantly from previous phase-shift predictions. With the inclusion of these new data the NN phase shifts and amplitudes (isospin 0 and 1) become well determined for the first time near 800 MeV.

No abstract

Measurements of the spin-transfer parameter Kr, r, for H(p, n)2p at 0' to calibrate the neutronbeam polarization clarify a normalization discrepancy affecting np data at LAMPF. The new data are in good agreement with theoretical predictions.

As part of an experimental study of the nucleon-nucleon interaction at medium energy, the free neutron-proton analyzing power A"{0", T")has been measured at nine incident neutron energies in the range 375~T"»775 MeV and for neutron c.m. angles in the range 57'~0"*~159'. Unpolarized neutrons with a broad continuum of energies, produced by interaction of an 800 MeV proton beam with a beryllium target, were scattered from a polarized proton target. At each angle, for the whole energy region, the scattered neutron and conjugate recoil proton were detected in coincidence. A previously unseen minimum is observed in the energy dependence of A"(0*-100') near 625 MeV.