The Josephson effect in superfluid helium-3 flowing through a narrow aperture
Kopnin N. B.
The Josephson current is calculated during the flow of helium-3 through a narrow aperture near the critical temperature. The critical current is proportional to (Tc — T)2 in the case of a diffuse reflection of particles from the vessel walls and it is proportional to (Tc — T) in the case of a specular reflection.