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Re: Astrophysics

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Posted by Zephram Cochrane/">Zephram Cochrane on December 2, 1999 15:33:08 UTC

: Lau: I know fermions have spin number in 'halves' and bosons have integral spin. what is spin actually refers to?(I mean in calculation) Is it related to the angular veocity? or angular momentum? or what??

: : Angular momentum is correct.

: : Lau: So spin = angular momentum? or is it proportional to it or something?

In quantum mechanics any observable is an eigenvalue of some operator. Different eigenvalues can correspond to discrete quantum numbers. To say that a particle has spin 1/2 with respect to a coordinate axis is to say that the component of its angular momentum along that axis is hbar/2. To say that it has spin one with respect to that axis is to say that the component of angular momentum along that axis is hbar, and so on.

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