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vincentchan
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some theorist predicts proton can decay, since the decay of proton does not violate any fundemantal conservation law. My question is, could neutrino decay? How come I have never heard of anyone say neutrino could decay?
Well a neutrino sitting there all on it's own could only turn into another lepton or else it would violate conservation of lepton number, and it couldn't turn into a charged lepton since that would violate conservation of charge, so a neutrino can only really turn into another flavour of neutrino- which just happens to be what they're doing all the time. Google for 'neutrino oscillation'.vincentchan said:some theorist predicts proton can decay, since the decay of proton does not violate any fundemantal conservation law. My question is, could neutrino decay? How come I have never heard of anyone say neutrino could decay?
vincentchan said:wouldn't the decay of proton violate the conservation of baryon's number?
I'd guess that in those theories it goes [tex]p \rightarrow n + e^+ + v[/tex], which doesn't violate anything, and happens in beta-plus decay.vincentchan said:conservation of lepton's number?
I am not talking about standard model here, as i said b4, some theorist has already predicted the proton will decay, wouldn't the decay of proton violate the conservation of baryon's number?
Take the neutrino massive and apply the law of energy-momentum conservation...
[tex]p \rightarrow n + e^+ + v[/tex]
vincentchan said:if neutrino has mass, it won't violate the conservation of energy+momentum when it decay into 2 photon
Haelfix said:Its a nuclear decay mode.
This apparent weirdness in energy nonconservation occurs because there are lots of orbiting protons and neutrons surrounding the reaction (actually lots of protons and very few neutrons)..
Beta plus decay commonly means the basic process p->n + e++v. It is a nuclear decay mode in that it can only happen if the proton is inside a heavier nucleus and the final state nucleus is more tightly bound; the process is forbidden in free space by energy conservation since a neutron alone is heavier than a proton.marlon said:What do you mean by these words ?
anti_crank said:Beta plus decay commonly means the basic process p->n + e++v. It is a nuclear decay mode in that it can only happen if the proton is inside a heavier nucleus and the final state nucleus is more tightly bound; the process is forbidden in free space by energy conservation since a neutron alone is heavier than a proton.
vincentchan said:i am not talking about feynman diagram or standard model here... i knew in the standard model, neutrino won't decay, so do proton... my question is, how come the theorist predicted the proton will decay into positron, but they didn't predict neutrino will decay into photon
oh come on, i said it was a guess, we were talking about lepton and baryon numbers. Anyway, googling for proton decay gives a GUT prediction of p-> e^+ + pi0, which violates both, so there you go.vincentchan said:doesn't violate anything?? I will give you one more post to correct what you said...Crashwinder said:[tex]p \rightarrow n + e^+ + v[/tex]
reilly said:The photon, probably on the order of ev/1000, will have a very, very slow frequency. It's not clear to me if the requisite neutrinos exist.
Regards,
Reilly Atkinson
Crashwinder said:Well a neutrino sitting there all on it's own could only turn into another lepton or else it would violate conservation of lepton number, and it couldn't turn into a charged lepton since that would violate conservation of charge, so a neutrino can only really turn into another flavour of neutrino- which just happens to be what they're doing all the time. Google for 'neutrino oscillation'.
Neutrinos are subatomic particles that have no electric charge and very little mass. Proton decay is a theoretical process in which a proton, one of the building blocks of atoms, decays into lighter particles.
If it is proven that protons can decay, it would fundamentally change our understanding of the universe and the laws of physics. It could also help explain the asymmetry of matter and antimatter in the universe.
No, there has not been any direct observation of a neutrino decaying into other particles. However, there have been experiments that suggest the possibility of neutrino oscillation, which would require neutrinos to have mass and therefore be able to decay.
There are several proposed theories for proton decay, including Grand Unified Theories (GUTs), Supersymmetry, and String Theory. However, none of these theories have been confirmed and the exact mechanism of proton decay is still unknown.
Currently, scientists are using large underground detectors to search for evidence of proton decay. However, because proton decay is a rare and hypothetical process, it is difficult to detect and measure. More research and advancements in technology are needed to fully understand and potentially observe proton decay.