Zieve, R. J.Mukharsky, Yu M.Close, J. D.Davis, J. C.Packard, R. E.2026-01-052026-01-050022-2291ORCID:/0000-0001-9303-9307/work/162950604https://hdl.handle.net/1885/733803729We have studied circulation in superfluid 3He-B with a vibrating wire. We find that the circulation quantum equals h/2 m3 to within experimental error at several pressures. We have also measured circulation in rotating superfluid 3He-B, and have observed a precessional motion of a single vortex line. Finally, we have found the unexpected result that circulation around the wire does not affect the pair-breaking critical velocity.25en199310.1007/BF001254280041443352