All Questions
Tagged with neutrons standard-model
26
questions
-1
votes
1
answer
136
views
Is this Why a Neutron can Decay Into a Proton, Electron and Electron Antineutrino?
A neutron is udd, then an u-anti-u starts to exist close to the neutron. Then the one d and u change places forming an uud (proton) and anti-ud which decays to an electron and electron-antineutrino. ...
5
votes
1
answer
987
views
Is an electron more stable than a proton/neutron?
Is an electron more stable than a proton/neutron under extreme temperature/pressure conditions, like several 100 millions K?
- 167
2
votes
2
answers
342
views
Do Neutrons Have a Charge Radius?
The radius of a proton is described as a "charge radius", about 0.84 fm. The neutron is about the same size, 0.8 fm, but has no measureable charge. Is this a contradiction? Are the two ...
- 368
0
votes
2
answers
1k
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What is the radius of the neutron?
I am trying to get a straight forward answer to the question of the experimental radius of the neutron. Codata group gives magnetic radius of about 0.84fm, while the negative mean square charge ...
3
votes
2
answers
183
views
$n+n \rightarrow n+n$ scattering through photon interaction (QED Process)
If I think about the quark level process then, two u quarks can scatter through photon exchange via QED interaction by following tree-level process
.
This is happening because u quark is electrically ...
1
vote
1
answer
191
views
Why is a Hydrogen Atom the most stable state? Free Neutron decay?
A free Neutron decays into a hydrogen atom (Proton, Electron, Electron Neutrino)
within 15 minutes. That means that a Down Quark transitions to an Up Quark because
2 Down Quarks + 1 Up Quark is an ...
- 11
1
vote
1
answer
439
views
What is the precise value of the lifetime of a neutron?
Free neutrons are unstable. It decays to proton, electron and an antineutrino via beta decay. Can we not do a quantum field theory calculation to predict the precise the decay width? Its inverse ...
- 11.8k
1
vote
1
answer
69
views
$W^-$ behavior in Neutron decay
Why does $W^-$ always decay into electron and anti-neutrino in neutron decay? Why doesn't the $W^-$ particle decay into quark-antiquark pair?
8
votes
3
answers
478
views
Are neutrons gauge neutral to all gauge forces?
Are neutrons gauge neutral to all gauge interactions?
Neutron has mass, so it does couple to gravity.
However, if we focus on the strong, electromagnetic EM, and weak forces,
are there gauge ...
- 4,336
5
votes
1
answer
575
views
Why protons are stable but Neutrons not?
just read something about standard model and find it very interesting, proton is made of there subatomic particle U,U,D and neutron have U,D,D .
electromagnetic force between U,U,D wants to rip apart ...
- 121
5
votes
3
answers
993
views
When are W-bosons emitted?
According to this Wikipedia page W-bosons are involved in beta decay. According to Wikipedia, this occurs when a down quark turns into an up quark and also emits a W− boson. When this happens in a ...
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3
votes
2
answers
933
views
Why is neutron slightly heavier than the proton? [duplicate]
With latest knowledge of QCD, is there any explanation for why the neutron is slightly heavier than the proton? Can it be boiled down to a simple formula?
user84158
6
votes
0
answers
1k
views
Why does the neutron have spin 1/2 and not 3/2?
The neutron is thought to consist of three tightly bound quarks, each with spin 1/2. Simple addition of angular momentum would tell us that the resulting system (neutron) could have either spin 1/2 or ...
- 599
1
vote
1
answer
934
views
Is the neutron its own antiparticle? [duplicate]
I have seen multiple claims that the neutron is its own antiparticle. However surely the antiparticle of the neutron would have a baryon number of -1 because it would consist of three antiquarks, each ...
- 113
3
votes
3
answers
3k
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Neutron-Antineutron Annihilation [closed]
Is the process $n + \bar{n} \rightarrow \pi^{+} + \pi^{-} + \pi^{0}$ possible?
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