Polarization transfer in H-2((p)over-right-arrow,(n)over-right-arrow)pp

We measured the 0 degrees polarization transfer of the H-2((p) over right a rrow, (n) over right arrow)pp reaction used to produce a high-intensity, mo noenergetic neutron beam. The 0(+) --> 0(+) reaction C-14((p) over right ar row, (n) over right arrow)N-14(2.31) has been used to calibrate a high-effi ciency polarimeter, which in turn was used to measure the polarization tran sfer in H-2((p) over right arrow (n) over right arrow)pp. With this data th e uncertainty on the polarization of the 70 MeV neutron beam, used for many different studies at PSI, is reduced to 1.1%. The data are compared to pre dictions of Faddeev calculations based on realistic nucleon-nucleon interac tions. (C) 1999 Elsevier Science B.V. All rights reserved.