Anisotropy of ion mobility and the superfluid energy gap in ³He-A

A numerically superior new scheme is introduced to evaluate the mobility tensor of electron bubblers in 3He-A from an exact quantum-mechanical solution for the anisotropic, elastic, 3He quasi-particle-negative ion scattering process. In particular, the authors discuss the temperature dependent magnitude of the energy gap in the superfluid A phase, Delta A(T), on the basis of all the available ion-mobility data.