NMR line shape of rotating He-3-B at large counterflow velocity

We have investigated the NMR line shapes of superfluid He-3-B in a rotating cylinder. In the vortex-free state at sufficiently large angular velocity of rotation, Ohm greater than or similar to 1 rad/s, the main feature of th e absorption spectrum is a large frequency-shifted peak above the Larmor fr equency. The shape of this counter-flow peak is both measures and calculate d as a function of external magnetic field strength, angular velocity, temp erature,and number of vortex lines. The NMR spectrum is derived from the ca lculated order-parameter texture. Reasonable agreement with the measured li ne shape is obtained by including line-broadening effects due to the extern al field inhomogeneity and Leggett-Takagi relaxation.