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

The spin-dependent total cross-section difference Delta sigma(T) has been measured at energies of 7.43, 9.57, and 11.60 MeV for neutrons, polarized transverse to the beam momentum, transmitted through a transversely 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). Phase-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.