Re: Do free particles have spin?
From: Edward Green (spamspamspam3_at_netzero.com)
Date: 09/25/04
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Date: 24 Sep 2004 17:14:24 -0700
glhansen@steel.ucs.indiana.edu (Gregory L. Hansen) wrote in message news:<cj1qq9$hpl$1@hood.uits.indiana.edu>...
> In article <w4mdnSYXV63XwsncRVn-pA@softcom.net>,
> David Rutherford <drutherford@softcom.net> 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.
>
> Polarization of light?
>
> Werner and friends showed that a neutron really is a spinor. They split a
> neutron beam in an interferometer, and showed that the neutrons in one leg
> must be rotated by 4*pi to return to their original state.
I seem to recall there is some macroscopic contruction involving
string which shares this property. Do you know what I'm talking
about?
> Polarizers and spin flippers are commonly used on neutron beam lines.
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