Dubna "Delta-Sigma" experiment: Results of treatment and analysis of statistics accumulated in 2001 data taking run on energy dependence of Delta sigma(L)(np)

New results on energy dependence of the Deltasigma(L)(np) over a GeV energy region are presented. Measurements of the np spin-dependent total cross section difference Deltasigma(L)(np) were carried out at the Synchrophasotron of the Laboratory of High Energies of the Joint Institute for Nuclear Research in Dubna. A quasi-monochromatic neutron beam was produced by break-up of accelerated and extracted polarized deuterons. The neutrons were transmitted through a large proton polarized target. The values of Deltasigma(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. In 2001 data taking rim the Deltasigma(L)(np) value were measured at 1.4, 1.7, 1.9 and 2.0 GeV. A fast decrease of Deltasigma(L)(np) with increasing energy above 1. 1 GeV, as it was first seen from our previous data, was confirmed. The obtained results are also compared with model predictions and with the phase shift analysis fits. The investigations are carrying out under a program of the "DELTA-SIGMA experiment" project. The aims of these studies are to obtain the values of imaginary and real parts of the spin-dependent forward np-scattering amplitudes over the energy range of 1.2-3.7 GeV for the first time.