Spin exchange in the solid helium 3

Problem on spin exchange in solid helium-3 i discussed. The consecutive calculation of exchange forces is carried out on the basis of perturbation theory, wherein the base of antisymmetric states of the particles system relative to the exchanges is applied. the exchange forces in the oscillators system are considered. It is shown that the quantum crystal heat capacity by approach of the temperature to the critical point experiences the jump, observed in the experiment. 7 refs