Universality of spin-relaxation for spin 1/2 particles diffusing over   magnetic field inhomogeneities in the adiabatic regime
  We present a theoretical analysis of spin relaxation, for a polarized gas of spin 1/2 particles undergoing restricted adiabatic diffusive motion within a container of arbitrary shape, due to magnetic field inhomogeneities of arbitrary form. 
M. Guigue and R. Golub and G. Pignol and A. K. Petukhov
cond-mat.other cond-mat.quant-gas physics.atom-ph