Experiments on orbital dynamics in superfluid 3He-A

The response of the orbital degrees of freedom of superfluid 3He-A to a magnetic field suddenly rotated through a small angle is a decaying exponential rather than an oscillatory response. Analysis of the field and temperature dependence of the time constant supports the Cross--Anderson orbital-viscosity theory as complemented by the Pethick--Smith relaxation-time theory, but reveals a discrepancy in the susceptibility-anisotropy energy near T/sub c/