VORTEX MUTUAL FRICTION IN ROTATING SUPERFLUID HE-3-B

We have measured the resistive and reactive mutual friction coefficients B and B′ in rotating superfluid He3-B at pressures of 1.6, 10, 20, and 29.3 bars. Near Tc, Bρnρ diverges as (Tc-T)a, with a-0.7, and B′ρnρ-2 tends to zero. Coefficients d and d that relate the force to vn-vL, the relative velocity of normal fluid and vortex lines show relaxation-dissipation behavior tending slightly towards resonant dissipation. Within our experimental error there is no clear indication of the expected vortex core transition in our data at 20 and 29.3 bars. © 1995 The American Physical Society.