For Bose liquids although their linear momentum could have the value of zero, their angular momentum could not unless the spins of half of the fluid particles are equal and opposite of the other half. Furthermore, at the quantum level angular momentum takes on only two values +nħ or –nħ where n is integer for bosons and half integer for fermions.
Deuteron is a composite of one proton and one neutron. Both are fermions and each with spin angular momentum of +ħ/2 giving a total angular momentum of +1ħ, which is now a boson’s spin. Likewise, for Cooper pair of two electrons, their individual spin is +ħ/2. Two electrons have a total spin of +1ħ, a boson.


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