Sebgr
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 Mar 5 comment Average value of Force in rotating bead using statistical physics Do you have a book source or can you include a diagram? Jan 20 comment Vector operators in quantum mechanics Thanks for the link! Jan 19 awarded Editor Jan 19 revised Vector operators in quantum mechanics Added extra comments, clarifications. Jan 19 asked Vector operators in quantum mechanics Jul 15 awarded Popular Question Jan 3 awarded Critic Dec 28 awarded Scholar Dec 28 accepted Why is the value of spin +/- 1/2? Sep 24 awarded Autobiographer Mar 23 awarded Supporter Mar 12 comment Relationship between nuclear spin and nuclear magnetic moment? I don't think so, total angular momentum is clearly defined as the sum of angular momentum and spin. Mar 12 comment Relationship between nuclear spin and nuclear magnetic moment? The source is Kenneth Krane's book 'Introductory Nuclear Physics'. $\langle s_j \rangle$ is the expected value for the $\vec{j}$-component of the spin vector, $\vec{s}$. We assume a fixed $z$ axis around which $\vec{j}$ -the sum of angular and spin momentum- rotates. In the book, it is said that if we want to measure $\langle s_z \rangle$, it suffices to know $\langle s_j \rangle$. Why? Mar 12 asked Relationship between nuclear spin and nuclear magnetic moment? Feb 5 comment Why is the value of spin +/- 1/2? I think it should be on the lines of your second option. Does it only have to do with the fact that $m_s$ is quantized on integer steps and only two states are seen in a Stern-Gerlach experiment (thus eliminating the possibility of $m_s=0$)? Feb 5 comment Why is the value of spin +/- 1/2? I suppose it has to do with how we measure the eigenvalues for spin (perhaps multiples of bohr's magneton) Feb 5 awarded Student Feb 5 asked Why is the value of spin +/- 1/2?