0 degree polarization transfer in 2H(rvec p,rvec n)pp at 54 and 71 MeV

Results of measurements of the transverse polarization transfer coefficients Kyy'(0 degree) for 2H(rvec p,rvec n)pp at 54 and 71 MeV are presented. The magnitude and energy dependence of this parameter have been determined with sufficient precision (4%) to permit the use of this reaction as a source of nearly monoenergetic polarized neutrons in precise measurements. Kyy'(0 degree) is found to have a significant dependence on excitation energy. The results at low excitation energy are in agreement with calculations in the impulse approximation using the nucleon-nucleon phase shifts obtained from the Bonn or Paris potentials. A substantial difference from the results obtained using the empirical phase shifts is found. Results of measurements of the longitudinal polarization transfer coefficient Kzz'(0 degree) at 54 MeV are also presented