Re: Do free particles have spin?

From: David Rutherford (drutherford_at_softcom.net)
Date: 09/25/04 

Date: Sat, 25 Sep 2004 10:05:17 -0700

Constantine wrote:
> "David Rutherford" <drutherford@softcom.net> wrote in message
> news:w4mdnSYXV63XwsncRVn-pA@softcom.net...
>
>>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.
>
>
> Spin is an intrinsic property of particles, independent of whether they
> interact or not. An electron has always spin 1/2 no matter what happens to
> it, it can not be changed. If you want to go into the details, check out the
> representations of the Poincare group (1-particle states) and/or a QFT book.

Thanks Constantine. I know that, theoretically, free particles have
spin, but I'm interested in experimentally confirmed properties of
particles, not theoretical properties. 

-- 
Dave Rutherford
"New Transformation Equations and the Electric Field Four-vector"
http://www.softcom.net/users/der555/newtransform.pdf
Applications:
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"Proposed Quantum Mechanical Connection"
http://www.softcom.net/users/der555/quantum.pdf

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