Measurements of the magnetic field map for the analyzing magnet of the 'Delta-Sigma' spectrometer

One of the main goals of the 'Delta-Sigma-experiment' project is measurement of the energy behaviour of spin-dependent NN observables A00kk(np), A00nn(np) and Rdp in the GeV region of the neutron beam. These observables are determined by measurement of proton yields from the np → pn charge-exchange reaction at 0 deg using a magnetic spectrometer. Measurements of the magnetic field map of the spectrometer magnet providing high accuracy in determining the proton momentum were carried out. The 'Delta-Sigma' set-up is placed at building 205 of the LHE, JINR. The spectrometer magnet 2-SP-94-1V has the external sizes 2.95 x 2.12 x 1.62 m and aperture 0.30 x 0.09 m. A three-component Hall probe was used. The measurement volume is 0.33 x 0.0645 x 1.02 m. A description of the measuring equipment, method and results is presented. The results are used for analysis of the physical data