Measurements of Kyy at 0° for the 2H(p,n)2p reaction at 50, 65 and 80 MeV

The polarization transfer coefficients Kyy at 0° were measured for the reaction of 2H(p,n)2p at 50, 65 and 80 MeV. Obtained Kyy(0°) values are −0.27 ± 0.05, −0.31 ± 0.03 and −0.37 ± 0.04 at 50, 65 and 80 MeV, respectively. Calculations assuming the impulse approximation with recent np scattering phase shifts are in disagreement with the observed data, indicating the need for a three-body calculation.