Spin Relaxation in SuperfluidHe3

We show that near the transition temperature $T_c$ the relaxation time introduced in Leggett and Takagi's phenomenological theory of spin relaxation in superfluid ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ is equal to the relaxation time of a normal-state quasiparticle at the Fermi energy at $T_c$, and is independent of the superfluid state. Combescot and Ebisawa's relaxation time is found to diverge as ${(T_c-T)}^{-\frac{1}{2}}$. These results are obtained by deriving and solving exactly the Boltzmann equation for quasiparticles in the superfluid.