Charge-exchange quasi-elastic process $nd\to p(nn)$ under $0^\circ$ in the frame of elastic $np\to np$ scattering to $180^\circ$

Abstract

It is considered the problem of spin physics related with the difference of representation of the elastic interaction between the neutron and proton. In the first case the charge-exchange reaction np → pn under the angle θ is supposed, in the second the simple elastic scattering of np → np, when the neutron is going in opposite direction π − θ. The transition from one representation to another is provided by the Majorana operator. In the framework of impulse approximation it is twice calculated the quasielastic charge-exchange reaction of a neutron on a deuteron. In the frame of nd → p(nn) scattering of proton to the angle θ it gives the well-known Dean formula. Using other representation nd → (nn)p as a neutron elastic scattering under the angle π − θ (together with neutron-spectator in nnpair) the alternative formula is presented.