Dubna "DELTA-SIGMA" experiment. Preliminary results on energy dependence of Delta sigma(L)(np) between 1.2-3.7 GeV for 20.01 data taking run

New results on energy dependence of the DeltasigmaL(np) over a GeV energy region are presented. Measurements of the np spin dependent total cross section difference DeltasigmaL(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 DeltasigmaL 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 the 2001 data taking run the DeltasigmaL(np) value were measured at 1.4, 1.7, 1.9 and 2.0 GeV: A fast decrease of DeltasigmaL (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 prediction's and with the phase shift analysis fits. The investigations are carrying out within a program of the "DELTA-SIGMA experiment" project. The aim of these studies is to obtain the values of imaginary and real parts of the spin-dependent forward np-scattering amplitudes over the energy range of 1.2-3.7GeV for the first time.