All Questions
Tagged with standard-model nuclear-physics
61
questions
12
votes
4
answers
2k
views
What will happen if we keep bringing two protons closer and closer to each other, starting from a large distance?
I am asking this question for theoretical understanding of the topic: What will happen if we keep bringing two protons closer and closer to each other, starting from a large distance?
I understand ...
- 2,517
9
votes
3
answers
839
views
Can the protium nucleus be in an excited state?
An electron in protium can absorb a photon and jump to an orbit of higher energy. Is an analogous procedure possible for the nucleus of protium (a single proton)?
Can this nucleus be in an excited ...
- 253
-2
votes
1
answer
105
views
Why is $\beta$ decay a weak force interaction?
In my graduation and also in post graduation, I was told that $\beta$ decay is a weak interaction. But till date I don't know the reason as if why it is a weak interaction process. In my classes some ...
2
votes
0
answers
36
views
Is there a list anywhere of known or hypothetical hypernuclei?
Does anyone have resources that include a list or set of descriptions of hypernuclei that been observed, or been proven to be possible hypothetically? Is it possible, even, that there is something ...
- 325
-2
votes
3
answers
208
views
Why aren't electrons composite particles like protons are? [closed]
I asked this question previously, but it was closed. I would like to try to explain what I am asking in a better manner.
Protons and electrons are opposite in charge: one is positive, and the other is ...
- 161
0
votes
0
answers
94
views
What are the dimensions of the proton's substructure?
I was looking over the "Visualizing the Proton" videos that MIT put out a few years ago, where the collision data from CEBAF, etc. was turned into a visual representation of quarks, gluons ...
- 57
2
votes
1
answer
137
views
Neutrino Cross-section approximation:
First, thank you for taking the time to read this question.
In section 5 of this paper the author explained that for energies between $1-20$ GeV the total Charged-Current Cross sections for $\nu_{\...
- 23
17
votes
1
answer
4k
views
Can a photon turn a proton into a neutron?
My guess it's yes, if the photon has enough energy to make up for the mass difference.
I imagine the following:
the photon turns into an electron+positron pair
the electron hits the proton and forms ...
- 587
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
views
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 ...
0
votes
1
answer
369
views
How do I determine what kind of fundamental interaction is responsible for a certain reaction? [closed]
can somebody explain to me how to determine - from the given chemical equation - what kind of interaction is responsible for a certain kind of process?
Examples:
$e^+ + e^-\to\tau^+ + \tau^-$
$K^+\to\...
- 1
1
vote
2
answers
745
views
Cause of Strong force
What is the origin and cause of the strong interaction which occurs between the nucleons? I have read that it is caused by the exchange of mesons but what then ultimately causes this meson exchange to ...
2
votes
1
answer
86
views
Are there any fusion reactions that reduce the number of baryons?
In the simplest of fusion reactions, two hydrogen nuclei fuse to form deuterium. Besides deuterium, we get a positron and an electron neutrino out of it. The positron combines with the extra electron ...
- 1,721
0
votes
1
answer
334
views
How strong nuclear force become repulsive at distance less than 0.7fm? What is its mechanism? [duplicate]
I read many times that strong force become repulsive at distance less than (0.7×10^-15 m) but no-one explains how? and what is its carrier particle? what is its mechanism?
I searched for answers so ...
- 1
0
votes
2
answers
234
views
Does isospin symmetry between different multiplets arise from flavour symmetry?
Initially we were introduced to isospin as a way of abusing the approximate symmetry of the strong force, e.g. we would define an $I=\frac{1}{2}$ group of $p$ with $I_3 = +\frac{1}{2}$ and $n$ with $...
- 2,604