The Ratio R (dp) of the quasielastic nd -> p(nn) to the elastic np -> pn charge-exchange-process yields at the proton emitting angle theta (p,lab)=0A degrees over 0.55-2.0 GeV neutron-beam energy region. Comparison of the results with the model-dependent calculations

摘要

Our new experimental results (see, e.g., Preprint JINR no. E1-2008-61 (Dubna, 2008)) on ratio R (dp) of the quasielastic charge-exchange yield at the proton emitting angle theta (p,lab) = 0A degrees for the nd -> p(nn) reaction to the elastic np -> pn charge-exchange yield were presented. The measurements were carried out at the Nuclotron of the Veksler and Baldin Laboratory of High Energies of the JINR (Dubna) at the neutron-beam kinetic energies of 0.55, 0.8, 1.0, 1.2, 1.4, 1.8, and 2.0 GeV. In this paper the comparison of the experimental R (dp) data with the obtained R (dp) calculations within the impulse approximation by using the invariant-amplitude sets from the GW/VPI phase-shift analysis is made. The R (dp) values calculated using the set of invariant amplitude data for the elastic np -> pn charge exchange at theta (p,CM) = 0A degrees, agree with the experimental data. This confirmed the nd -> p(nn) process yield at theta (p,CM) = 0A degrees is caused by the contribution of the spin-dependent part of the elastic np -> pn charge-exchange reaction. Thus, it has been shown that the obtained experimental R (dp) results can be used for the Delta-Sigma experimental program to reduce the total ambiguity in the extraction of the amplitude real parts.