MEASUREMENTS OF DELTA-SIGMA(TAU) IN POLARIZED-NEUTRON-POLARIZED-PROTON SCATTERING

The spin-dependent total cross-section difference Delta sigma(T) has b een measured at energies of 7.43, 9.57, and 11.60 MeV for neutrons, po larized transverse to the beam momentum, transmitted through a transve rsely polarized proton target. In addition, the energy at which Delta sigma(T) crosses through zero has been determined in the energy range 3.65-6.25 MeV. The measurements were carried out with a polarized TiH2 target and polarized neutrons from the H-3(p,n)He-3 and H-2(d,n)He-3 reactions. The cross-section differences Delta sigma(T) are sensitive to the strength of the S-3(1)-D-3(1) mixing parameter epsilon(1). Phas e-shift analyses are used to determine epsilon(1) values from the data . The values are in good in agreement with NN potential models and do not support the low epsilon(1) values found in previous studies around 15-20 MeV.