Particle Spinning: Why and What Happens If They Stop?

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    Particle Spinning
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This discussion centers on the concept of particle spin in quantum mechanics, emphasizing that particles possess an intrinsic property known as "spin," which is fundamentally different from classical spinning objects. The term "spin" is a misnomer, as it does not imply physical rotation but rather describes angular momentum characteristics. Participants highlight that while quantum mechanics allows for predictions based on measurements, the underlying reasons for properties like spin and charge remain elusive, with no classical analogs to explain them. The conversation also references the Stern-Gerlach experiment as a practical illustration of spin.

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  • #31
N88 said:
Why? Because if "orbital angular momentum" is the same as ## \overrightarrow{L}##, then it seems to me that the EPRB particles are not orbiting??.

I don't know the details of it,but no, I would think that, conceptually, you're creating an electron-positron pair that are heading off in opposite directions, so there is no orbital angular momentum in the center of mass frame.
 
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  • #32
If it is only for the sake of understanding the EPR experiment, you could use pairs of compound particles. If the particles which make up the compound particle, have no spin of their own, the spin of the compound particle will be equal to the orbital angular momentum L. L will have more than two possible values, so the EPR experiment will turn out slightly more complicated.
 

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