Physics Questions People Ask Fermilab

12/03/2016 - 08:26 von Rockwell Commander | Report spam
Neutrino Spin
How does one determine the spin of neutrinos? Since they have no charge.

I assume he is thinking of doing some kind of Stern-Gerlach experiment and it is true that you cannot use this method to measure the spin of an uncharged particle (actually, technically, you need a magnetic moment which is related to the product of the spin and the charge). What you can do is collide neutrinos with particles of known spin and examine the distributions of the remnants or, even more simply, look at the decays of particles with known spin. For example, if a zero spin particle decays into a spin 1/2 particle and a neutrino, then you know that the neutrino must be spin 1/2 since there are no other combinations that conserve spin (An aside, add two spin 1/2 particles with no orbital angular momentum between them and the parent can be either spin 0 or spin 1. In this case, however, you know the parent was spin 0 so you know the neutrino spin is 1/2).
 

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#1 Rockwell Commander
12/03/2016 - 12:00 | Warnen spam
Am Samstag, 12. Màrz 2016 08:26:57 UTC+1 schrieb Rockwell Commander:
Neutrino Spin
How does one determine the spin of neutrinos? Since they have no charge.

I assume he is thinking of doing some kind of Stern-Gerlach experiment and it is true that you cannot use this method to measure the spin of an uncharged particle (actually, technically, you need a magnetic moment which is related to the product of the spin and the charge). What you can do is collide neutrinos with particles of known spin and examine the distributions of the remnants or, even more simply, look at the decays of particles with known spin. For example, if a zero spin particle decays into a spin 1/2 particle and a neutrino, then you know that the neutrino must be spin 1/2 since there are no other combinations that conserve spin (An aside, add two spin 1/2 particles with no orbital angular momentum between them and the parent can be either spin 0 or spin 1. In this case, however, you know the parent was spin 0 so you know the neutrino spin is 1/2).



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