It is shown that the differential cross sections of the reactions $dd\to ^3He n$ and $dd\to ^3H p$ measured at c.m.s.scattering angle$\theta_{ cm}=60^\circ$ in the interval of the deuteron beam energy 0.5 - 1.2 GeV demonstrate the scaling behaviour,$d\sigma/d t\sim s^{ -22}$, which follows from constituent quark counting rules. It is found also that the differential cross section of the elastic $dp\to dp$ scattering at $\theta_{ cm}=125^\circ-135^\circ$ follows the scaling regime $\sim s^{ -16}$ at beam energies 0.5 - 5 GeV. These data are parameterized here using the Reggeon exchange.
Categories: hep-ph nucl-th