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In quantum mechanics, the angular momentum of any system is quantized: its magnitude can only take values
S**2=h**2s(s+1)

where  is the reduced Planck's constant, and the spin quantum number s is a non-negative integer or half-integer (0, 1/2, 1, 3/2, 2, etc.). The possibility of half-integer quantum numbers is a major difference between spin and orbital angular momentum; the latter can only take integer quantum numbers. The value of s depends only on the type of particle, and cannot be altered in any known way

For instance, all electrons have s = 1/2. Other elementary spin-1/2 particles include positrons, neutrinos and quarks. Photons are spin-1 particles, and the hypothetical graviton is a spin-2 particle. The hypothetical Higgs boson is unique among elementary particles in having a spin of zero.

[ Last edited by yuhuobuku on 2008-9-28 at 12:45 ]
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