Measurement of theH2(p, n)ppTransverse Polarization Transfer Coefficient at 20.4 MeV

The transverse polarization transfer coefficient, ${K_y}^{y^{\prime }}$, has been measured for the reaction ${}_{}{}^2{}_{}{}^{}\mathrm{H}(p, n)pp$ at 18° for $E_p=20.4\mathrm{}$ MeV as a function of neutron energy. Although predictions based on a three-body separable-potential model with $S$-wave $N-N$ interactions are in reasonable agreement with the data, the need for a three-body theory with more realistic $N-N$ forces is indicated.