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Measurements of the order parameter texture of rotating superfluid 3He-B havebeen performed as a function of the applied azimuthal counterflow velocity downto temperatures of 0.2Tc. The results are compared to the hydrostatic theory of3He-B. Good agreement is found at all measured temperatures and rotationvelocities when the flow anisotropy contribution to the textural free energy isadjusted. This gives a superfluid energy gap Delta(T) which agrees with thatmeasured by Todoshchenko et al., with Delta(0)=1.97kBTc at 29.0 bar. TheB-phase susceptibility, longitudinal resonance frequency, and textural phasetransition have been extracted from the measurements as a function oftemperature and azimuthal counterflow velocity. Owing to decreasing absorptionintensities the present measuring method, based on the line shape analysis ofthe NMR spectrum, loses its sensitivity with decreasing temperature. However,we find that in practice the measurement of vortex numbers and counterflowvelocities is still feasible down to 0.2Tc.

Textures of Superfluid 3He-B in Applied Flow and Comparison with Hydrostatic Theory