I have been reading about Feshbach resonance in ultra cold atoms and there were some areas I'd like to understand better/have questions about:

i) As the atoms approach each other, can their spins be in any orientation? The literature isn't explicit. My assumption is they win have random spins, I wanted to check this is the right assumption. I.e. in a BEC, are the spins still uncorrelated?

ii) In which direction would the magnetic field have to be applied? As the atoms are moving in a random motion, would it just be a uniform magnetic field? Again - my assumption is it would be a simple magnetic uniform field if the spins are indeed random.

Thanks in advance!


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