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PHYS852 Quantum Mechanics II, Spring 2009 Consider a system of three spins, with s1 = 1, s2 = 1 and s3 = 1. The total angular momentum is then S = S1 + S2 + S3 . What are the allowed s values for the total angular momentum, and what are the degeneracies of each s level? Hint: Break it up into S = S1 + S2 + S3 and ﬁrst compute S ′ = S1 + S2 . ...
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