Re: Do free particles have spin?

From: David Rutherford (drutherford_at_softcom.net)
Date: 09/26/04 

Date: Sun, 26 Sep 2004 00:56:03 -0700

Constantine wrote:

> "David Rutherford" <drutherford@softcom.net> wrote in message
> news:ts-dnWB56rwHOcjcRVn-rg@softcom.net...
>
>>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.
>>
>
>
> I don't understand what you mean by "experimentally confirmed properties of
> particles, not theoretical properties".

The only experiment said to confirm electron spin that I knew of before
I posted my OP was the Stern-Gerlach experiment. That experiment used
atoms (silver, I believe), not free electrons. I was wondering if there
had been any spin experiments where they used free electrons (or other
particles). 

-- 
Dave Rutherford
"New Transformation Equations and the Electric Field Four-vector"
http://www.softcom.net/users/der555/newtransform.pdf
Applications:
"4/3 Problem Resolution"
http://www.softcom.net/users/der555/elecmass.pdf
"Action-reaction Paradox Resolution"
http://www.softcom.net/users/der555/actreact.pdf
"Energy Density Correction"
http://www.softcom.net/users/der555/enerdens.pdf
"Proposed Quantum Mechanical Connection"
http://www.softcom.net/users/der555/quantum.pdf

Relevant Pages

  • Re: Do free particles have spin?
    ... I know that, theoretically, free particles have ... The only experiment said to confirm electron spin that I knew of before ... atoms, not free electrons. ...
    (sci.physics)
  • Re: IS this for real?!
    ... The uncertainty principle says that the ... These correspond to the spin axis aligned with your chosen ... Now if a particle with 0 spin decays into two particles ... you place two detectors with their measurement axes parallel, ...
    (sci.crypt)
  • Re: Why are the people i work with so much more annoying than i am?
    ... In physics, spin refers to the angular momentum intrinsic to a body, as ... Quantum mechanical spin possesses several ... Spin of elementary and composite particles ...
    (rec.running)
  • Re: why general relativity is non-linear
    ... > The gravitational force is caused by spin 2 force carriers. ... > they become fermions with positive and negative electric charges. ... > These deflected carriers and fermions reduce the force of gravity to ... > rest mass to other particles and compress the bosons increasing their ...
    (sci.physics.particle)
  • Re: Download a new book on quantum mechanics and relativity.
    ... things which live in spacetime in special relativity". ... > are not observables. ... Even if the two particles are different, the spin ...
    (sci.physics.particle)