Question on spin

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Alan Grayson

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Apr 18, 2020, 2:56:27 AM4/18/20
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What's the difference in behavior when a beam of spin 1 particles passes through a SG device, compared to spin 1/2 particles? TIA, AG

John Clark

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Apr 18, 2020, 1:39:35 PM4/18/20
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On Sat, Apr 18, 2020 at 2:56 AM Alan Grayson <agrays...@gmail.com> wrote:

> What's the difference in behavior when a beam of spin 1 particles passes through a SG device, compared to spin 1/2 particles? TIA, AG

A Stern–Gerlach device uses magnets to seperate out fermions like electrons into beams of spin +1/2 and spin -1/2 particles, a SG device won't work for a beam of boson such as photons. To do something comparable and separate spin +1 photons from spin -1 photons you'd use a polarizing filter not a magnet.

 John K Clark




 

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Brent Meeker

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Apr 18, 2020, 1:43:20 PM4/18/20
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A W boson would be the only spin1 particle with a magnetic moment.  Since it has liftime of 3e-35 seconds I doubt anyone has sent W bosons thru an SG; but in theory they should act just like silver atoms or other particles with a magnetic moment.

Brent

On 4/17/2020 11:56 PM, Alan Grayson wrote:
What's the difference in behavior when a beam of spin 1 particles passes through a SG device, compared to spin 1/2 particles? TIA, AG

Alan Grayson

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Apr 18, 2020, 6:24:13 PM4/18/20
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On Saturday, April 18, 2020 at 11:43:20 AM UTC-6, Brent wrote:
A W boson would be the only spin1 particle with a magnetic moment.  Since it has liftime of 3e-35 seconds I doubt anyone has sent W bosons thru an SG; but in theory they should act just like silver atoms or other particles with a magnetic moment.

Brent


Then why does Feynman have spin 1 particle responding to a magnetic field? Same question for Clark.  https://www.feynmanlectures.caltech.edu/III_05.html . AG


On 4/17/2020 11:56 PM, Alan Grayson wrote:
What's the difference in behavior when a beam of spin 1 particles passes through a SG device, compared to spin 1/2 particles? TIA, AG
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Brent Meeker

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Apr 18, 2020, 7:10:01 PM4/18/20
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On 4/18/2020 3:24 PM, Alan Grayson wrote:


On Saturday, April 18, 2020 at 11:43:20 AM UTC-6, Brent wrote:
A W boson would be the only spin1 particle with a magnetic moment.  Since it has liftime of 3e-35 seconds I doubt anyone has sent W bosons thru an SG; but in theory they should act just like silver atoms or other particles with a magnetic moment.

Brent


Then why does Feynman have spin 1 particle responding to a magnetic field? Same question for Clark.  https://www.feynmanlectures.caltech.edu/III_05.html . AG

He's probably referring to a spin 1 ATOM.

Brent
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