New experimental results on the ratio R (dp) of the quasielastic charge-exchange yield at the outgoing proton angle Theta (p,lab) = 0 degrees for the nd -} p(nn) reaction to the elastic np -} pn charge-exchange yield, are presented. The measurements were carried out at the JINR Nuclotron at the neutron-beam kinetic energies of 0.55, 0.8, 1.0, 1.2, 1.4, 1.8, and 2.0 GeV.
The neutron beam with small moment spred was produced by breakup of accelerated deuterons. The accumulated data treatment and analysis, as well as possible sources of the systematic errors are discussed.