Re: Do free particles have spin?
From: EjP (nospam_at_hackers.are.bad)
Date: 09/27/04
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Date: Mon, 27 Sep 2004 09:38:41 -0500
David Rutherford wrote:
> Is there any evidence for the existence of particle spin for free
> particles, that is, for particles not bound to atoms? If so, please give
> references or links.
>
The SLC and SLAC made and studied polarized electron beams for
several years:
http://mitbates.mit.edu/pesp2002/talks/Clendenin_SLACPES.ppt
Muon spin precessions are studied in detail in g-2 experiments:
http://www.g-2.bnl.gov/index.shtml
Muon and tau spin is verified by their decay distributions (start
by reading a decent textbook, like Halzen and Martin, then reading
the about the corresponding measurments).
Compton scattering is highly dependent on the polarization states
of both the target particle and the photon beam.
(Google "Compton Polarimetry" = 296 hits).
The list of confirmations of particle spin is almost literally
endless. Perhaps if you ask a more specific question, someone
can give you a better answer.
-E
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