MEASUREMENTS OF ENERGY BEHAVIOURS OF SPIN-DEPENDENT np OBSERVABLES OVER A GEV REGION

Sharov, V.I. ; Anischenko, N.G. ; Antonenko, V.G. ; Averichev, S.A. ; Azhgirey, L.S. ; Bartenev, V.D. ; Bazhanov, N.A. ; Belyaev, A.A. ; Blinov, N.A. ; Borisov, N.S. ; Borzakov, S.B. ; Borzunov, Yu. T. ; Bushuev, Yu. P. ; Chernenko, L.P. ; Chernykh, E.V. ; Chumakov, V.F. ; Dolgii, S.A. ; Fedorov, A.N. ; Fimushkin, V.V. ; Finger, M. ; Finger, M. ; Golovanov, L.B. ; Gurevich, G.M. ; Janata, A. ; Kirillov, A.D.
JINR

Year: 2004
Page No: 406-410
Pages: 5
Year: Dubna 2004 JINR

Abstract: New accurate results of the neutron-proton spin-dependent total cross section difference - $\Delta_{\sigma_L}$ (np) at the neutron beam kinetic energies 1.4, 1.7, 1.9 and 2.0 GeV are presented. A fast decrease of - $\Delta_{\sigma_L}$ (np) with energy increase above 1.1 GeV and a structure in the energy dependence around 1.8 GeV, first observed from our previous data, seem to be well pronounced. The - $\Delta_{\sigma_L}$ quantities for isosinglet state I= 0, deduced from the measured $\Delta_{\sigma_L}$ (np) values and known - $\Delta_{\sigma_L}$ (pp)data, are also given. Preparation of the spin-correlation parameters $A_{ookk}$ (np) and $A_{oonn}$ (np) measurements is in progress. Measurements were carried out at the Synchropha-sotron and Nuclotron of the Veksler and Baldin Laboratory of High Energies of the Joint Institute for Nuclear Research. The aims of these studies is to determine for the first time the imaginary and real parts of the np spin- dependent forward scattering amplitudes over energy range of these Dubna accelerators.

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