[en] Behaviour of rho-wave of scattering amplitude of nucleon on nucleon, t₀(p.p',k²), is investigated as function of momentum p under the condition that k²/2m, i.e. the relative energy of two nucleons, is fixed and p'=k. The amplitude tsub(e)(p,p',ksup(2)) is found by numerical solution of the Lippman-Schwinger equation (LSE). For low energies 0< k²/2m<4.1 MeV the LSE solution is obtained on the basis of the Krylov-Bogolyubov method, and within the Pade approximation for sufficiently high energies 160< k²/2m<330 MeV. Calculated values of the scattering amplitude t₀(p,k,k²) for k²/2m=166.2 MeV and 332.5 Mev and for the square-well and Wood-Sackson interaction potentials are plotted on graphs as functions of momentum p