Quantum spins mixing in spinor Bose-Einstein condensates
  We examine the internal structure of the ground states of a trapped Bose-Einstein condensate in which atoms have three internal hyperfine spins. We determine a set of collective spin states which minimize the interaction energy between condensate atoms. We also examine the internal dynamics of an initially spin polarized condensate. The time scale of spin-mixing is predicted. 
C.K. Law, H. Pu and N.P. Bigelow