Spin depolarization of muons in UHe

An attenuation of the precession of spins of positive muons in liquid helium has been observed. In the normal state the depolarization rate is lambda = 0.08 s , while in the superfluid state this rate increases with decreasing temperature, reaching lambda = 0.15 s at T = 1.5 K. In He-II, this process is accompanied by a rapid depolarization with a scale time tauapprox. =0.5 s.