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Originally Posted by AntonioLao The outcry of quantum spin for its unintentional misunderstanding is contained in the 1st paragraph of Chapter VIII, Volume 3. 3rd Edition, Course of Theoretical Physics, Quantum Mechanics (Non-relativistic Theory) by L. D. Landau, et al, Pergamon Press, 1958 and quoted:
“In both classical and quantum mechanics, the law of conservation of angular momentum is a consequence of the isotropy of space with respect to a closed system. This already demonstrates the relation between the angular momentum and the symmetry properties under rotation. In quantum mechanics, however, the relation in question is a particularly far-reaching one, and essentially constitutes the basic content of the concept of angular momentum, especially as the classical definition of the angular momentum of a particle as the product of r ´ p has no direct significance in quantum mechanics, owing to the fact that position and momentum cannot be simultaneously measured.” |
What
force could stop a quantum spin?Any Ideas!
kind regards michael.