New results for the np spin-dependent total cross section difference AaL(np) at neutron beam kinetic energies of 1.59, 1.79 and 2.20 GeV are presented. Measurements of the AaL (rip) energy dependence were carried out at the Synchrophasotron of the Laboratory *) e-marl: sharovOsunhe.jinr.ru t) Deseased Czechoslovak Journal of Physics, Vol. 50 (2000), Suppl. S1 325 V.I.Sharov e~ al. of High Energies of the Joint Institute for Nuclear Research in Dubna. The values of AO'L were measured as a difference between the np total cross sections for parallel and antiparallel beam and target polarizations, both oriented along the beam momentum.A fast decrease of AaL(np) with increasing energy above 1.1 GeV, as it was first seen from our previous data, was confirmed. The new results are also compared with model predictions and with the phase shift analysis fits. The AO'L quantities for isosinglet state I=0, deduced from the measured values of AaL(np) and known AO'L(pp) data, are given.
A A8'7 V.L Sharov et el.New data on the spin-dependent np observables measured with quasi-monochromatic polarized neutron beam in the energy region from 1.2 to 3.7 GeV are presented. Further measurements of np scattering observables using the JINR LHE polarization facility (longitudinal and transverse polarized neutron beams and a polarized proton target) are discussed. The aim of these studies is to determine the imaginary and real parts of the forward scattering amplitudes for np and for isospin I = 0 systems above 1.1 GeV.
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