Questions tagged [protons]

A proton is a positively charged particle which is generally considered to be a composite particle comprising of three quarks interacting through the strong force (e.g. in the standard model.)

Filter by
Sorted by
Tagged with
0 votes
2 answers
50 views

Model of a neutron composed of a proton and an electron

Is it possible to establish a model to describe neutrons as electrons and protons bound by the coulomb force? what disadvantages would it have?
user avatar
  • 13
1 vote
1 answer
27 views

Kinetic energy of quarks and mass of proton

I read that: Most of a proton mass comes from the energy of motion of its three quarks and from the energy carried by the gluons that keeps them confined together. Does kinetic energy of the three ...
user avatar
  • 3,813
0 votes
0 answers
19 views

Would there be no electrostatic repulsion if you make two protons hit head on w.r.t their spin (i.e. opposite angular momentum)?

Basically the title. If you have two protons the have a strong electrostatic repulsion. However their spin produces a magnetic field and if you orient them like in the picture there would be magnetic ...
user avatar
-1 votes
1 answer
77 views

Why is it when an atom gains a proton it is said to become an 'atom' of a different element?

My confusion lies in that the number of protons in the nucleus will increase but is the number of electrons assumed to automatically follow suit such that the result is a neutral atom with equal ...
user avatar
  • 13
1 vote
0 answers
44 views

Does a free proton shrink when accelerated?

Reading about the charge radius of the proton and proton radius puzzle I started wondering if the cross section and therefore also the charge radius (i.e. size of proton) changes or more specifically ...
user avatar
  • 3,011
0 votes
2 answers
80 views

Why does the proton have the same elementary charge value $e$ as the electron? [duplicate]

Maybe a silly question but I am looking for an analytic explanation of it. I think I already have one but I want to see if there is a better one, more fundamental? What does it mean fundamentally ...
user avatar
  • 3,011
0 votes
1 answer
61 views

What is the value of the SPIN magnetic moment of a proton?

If I understand it correctly the anomalously large total magnetic moment of the proton inside the nucleus of the atom is because it is a combinatoric particle and there are contributions by the quarks'...
user avatar
  • 3,011
28 votes
6 answers
4k views

How is Alpha Radiation possible?

Alpha radiation would seem to occur when a pair of protons and neutrons are magically plucked from the amorphous (i.e. having no particular structure) nucleus of a heavier atom. Some of the problems ...
user avatar
  • 313
0 votes
2 answers
101 views

How were the electrons, protons counted in an atom?

The title says it all! In high school I remember it being taught as a religion, I had to believe the count (hydrogen has 1 proton, carbon has 6 etc...) , but how can I be sure I was told the truth?
user avatar
  • 141
1 vote
5 answers
106 views

Force between two protons

Yesterday my teacher was teaching about the production of photons, he told that photons are produced when the electron move from a higher energy level to a lower energy level then suddenly a idea ...
user avatar
1 vote
0 answers
41 views

How photon beam can be attained through Proton Accelerator?

I'm recently had been reading quite a lot about ADS and transmutation possiblity of Proton beam to neutralize nuclear waste. I came across with an Article from Big THINK https://bigthink.com/the-...
user avatar
0 votes
3 answers
89 views

A positively charged objects move towards a negatively charged object, but it is a fact that protons do not move. How is that?

This is probably a very basic to most of you physics people but It's frustrating me and I need to get answers ASAP. Just saw an experiment on YouTube where they rub a silk on some sort of glass rod, ...
user avatar
0 votes
1 answer
53 views

Proton accelarating in homogeneous electric field

Hi I was studying for my physics exam, when I ran in to this problem. A proton in a particle accelerator uniformly accelerated in 3.23 ms over a distance of 1 km. The field in which the proton is ...
user avatar
0 votes
0 answers
69 views

Source of a problem on pion-proton interaction in elementary particles

What book is this picture taken from? It is page 383 of the book in question.
1 vote
1 answer
34 views

By how much protons dipole moment inside a nucleus attenuate the culomb force between them?

By how much protons dipole moment inside a nucleus attenuate the culomb force between them? As up quarks repel more than down quarks the protons should be oriented with the positive side looking away ...
user avatar
43 votes
10 answers
10k views

Why can atoms only gain or lose electrons and not protons?

I know that an object can become net negative or net positive by losing or gaining electrons, and having more or fewer protons than electrons but why can't protons be transferred too?
user avatar
2 votes
2 answers
97 views

How can net field inside a conductor be zero at every point? What if a charged particle is at that point?

The net electric field at any point inside a conductor which is not connected to an EMF source is zero and an external field is present. What is net electric field? It is the net field due to all the ...
user avatar
  • 424
0 votes
3 answers
113 views

How Can Maxwell's Equations Describe Both Photons and Electrons/Protons?

As an analogue to an existing question about how Maxwell's equations and photons relate [1], I'm curious how Maxwell's equations relate to charged particles, e.g. electrons and protons? That is, how ...
user avatar
  • 149
18 votes
4 answers
4k views

Are some protons more massive than others due to spinning at a different rate or being in a more excited state?

The old Usenet Physics FAQ, which is a page originally by Matt Austern, says that all protons have identical rest masses, and so do all electrons, and so do all neutrons; these masses can be looked ...
user avatar
1 vote
2 answers
125 views

Do Protons Have a Surface?

In searching for the radius of a proton, the Wikipedia page "Proton" states "Because protons are not fundamental particles, they possess a measurable size;...." As my physics is ...
user avatar
0 votes
0 answers
39 views

How to understand Proton Structure-function (pdf)

I am trying to understand the behavior of the proton structure function shown in the image for fixed $Q^2$ and varying Bjorken scaling x for the following cases: point-like particle $3$ non-...
user avatar
1 vote
0 answers
45 views

By which interaction will proton decay? [duplicate]

I learned that proton takes at least $10^{34}$ years to decay. If it will decay one day, will it decay via weak interaction or some other interaction?
user avatar
2 votes
1 answer
87 views

Protons and QED

I have been researching quantum electrodynamics recently and I have found out that when electrons repel each other, they constantly exchange photons with each other. When two protons repel, do they ...
user avatar
  • 234
-1 votes
1 answer
45 views

Can a single nucleon undergo beta decay an infinite number of times?

Can a single nucleon (i.e., neutron or proton) undergo beta decay (+ or -)an infinite number of times? If so, how does this square vs. the principle of conservation of mass/energy? If not, what are ...
user avatar
2 votes
1 answer
85 views

Why is there a discrepancy between $m_n-m_p$ and $m_d-m_u$?

The difference in mass between a neutron and a proton is $1.3\space {\rm MeV}/c^2$, but the mass difference between an up quark and a down quark is $2.5\space{\rm MeV}/c^2$. How come the mass ...
user avatar
  • 734
0 votes
0 answers
14 views

Penning trap with positrons: observing annihilations?

Has a single positron been deliberately put into contact with an electron to observe the results? If so, does the annihilation occur only when the two particles "touch" or is the definition ...
user avatar
  • 1,926
6 votes
1 answer
679 views

How do you make antiprotons?

What is the reaction that makes antiprotons? I'm not a physicist so I might not understand the shorthand.
user avatar
4 votes
3 answers
314 views

What percentage of a Proton's mass is potential/kinetic energy?

So in an hydrogen atom, the total mass of the atom is equal to the masses of the proton, the electron, minus their net binding energy of around 13 eV. Making the total less massive than the sum of its ...
user avatar
2 votes
2 answers
609 views

Why does supplying energy makes an electron go away from the nucleus?

My question is: the energy of electron is considered to be negative, so when the energy is supplied though photons the energy of an electron increases (tends toward positive direction) and they get ...
user avatar
1 vote
1 answer
67 views

Why are there (roughly, at least) equal numbers of electrons and protons in the universe, despite their hugely differing masses? [closed]

Other people have asked very similar questions, but I cannot find an explanation or question referring to their vastly differing masses (approx. 1836 to 1).... Also, if there are almost 2000 times as ...
user avatar
  • 3,443
0 votes
0 answers
17 views

How would you remotely detect interaction of a beam of 1 GeV protons with an aluminum sheet?

The inelastic interaction with an electron of the aluminum atom would knock them out of the atom, and would give rise to emission lines characteristic of aluminum when a free electron filled the ...
user avatar
  • 11
0 votes
2 answers
68 views

Is it possible that a sufficiently high energy photon can be absorbed by the proton and emitted back without resulting in a fission?

I have read that photons can be absorbed by the protons inside the atom and this would result in a fission, nucleon ejection, or photon emission. Assuming the photon has sufficient amount of energy, ...
user avatar
  • 690
-1 votes
2 answers
99 views

What are protons and electrons (in context of the real matter not + and -)?

We all know that protons are positively charged, and electrons are negatively charged. It is also known that electrons are lighter than protons, and they both attract each other. Both have the same ...
user avatar
0 votes
3 answers
134 views

How exactly does the quark gluon plasma prevent protons from forming?

I have read this question: The difference is that the quark-gluon plasma is governed by the dynamics of the strong interaction, which isn't very well understood, so that's what people are interested ...
user avatar
0 votes
1 answer
37 views

Why should the EM interaction cause a mass difference between neutron and proton but not between $u$-quark and $d$-quark?

The reason why the $u$-quark and the $d$-quark have different masses is that they couple with different Yukawa coupling strengths to the Higgs field. My understanding is that this is the sole reason ...
user avatar
0 votes
2 answers
74 views

Can positive charge flow when a conductor is earthed?

I have read that when a conductor is earthed, electrons from the earth travel towards the conductor (if conductor have excess positive charge) and electron are transferred to earth ( if conductor have ...
user avatar
1 vote
1 answer
186 views

Number of gluons inside a proton/neutron

In the model of constituent quarks, of course very different of the picture of QFT about what a QCD proton/neutron is, protons are made of 3 quarks. However, how many gluons are inside a proton? After ...
user avatar
  • 5,373
0 votes
1 answer
62 views

Effective description of the EM interaction of protons by modifying the original Dirac equation [duplicate]

Dirac equation describes elementary fermions (e.g., electrons, muons, etc). When coupled to electromagnetic fields, the $g$-value comes out to be equal to $2$ which is exactly the value for the ...
user avatar
7 votes
5 answers
2k views

Proton Electron Merger

Can somebody explain what would happen if an electron & a proton, very close to each other are left to "fall" to each other in a straight line?
user avatar
  • 165
1 vote
0 answers
24 views

Why choose frozen hydrogen for proton spin polarization testing?

Is frozen hydrogen particularly good for polarizing proton spin? Or are other elements particularly bad? It takes quite an effort to reach the near absolute zero necessary to freeze hydrogen. See ...
user avatar
  • 3,486
2 votes
1 answer
146 views

Does the electron capture process ever occur in hydrogen?

I know that electron capture occurs more readily in heavier, often unstable atoms, but does it ever happen at all in a lighter atom? I suppose, in ordinary hydrogen, a free neutron would then be ...
user avatar
  • 3,443
1 vote
0 answers
58 views

Is there any meaningful notion of a probability distribution for the number of quark-antiquark pairs in a hadron?

A hadron (such a proton) can be thought of as being composed of a large (but fluctuating) number of quark-antiquark pairs. As far as I understand it, the situation (say for a proton, for definiteness) ...
user avatar
  • 41.3k
0 votes
0 answers
54 views

Are the arrangements of quarks in hadron ground-state wavefunctions rotationally symmetric?

The Hamiltonian of quantum chromodynamics (like the rest of the Standard Model) is rotationally symmetric. My question is whether these space symmetries are spontaneously broken in the ground state of ...
user avatar
  • 41.3k
0 votes
0 answers
42 views

Structure function of the proton

I am trying to visually (sketch) understand how the structure function of i.e proton changes when we consider it like a sphere or as a constitute of interacting or non interacting quarks. ...
user avatar
  • 934
0 votes
3 answers
361 views

What is the SI unit for the mass of subatomic particles?

Question: What is the SI unit for the mass of subatomic particles? Notes: The weight of a proton is about $1.7 \cdot 10^{-24}\mathrm g$. This is the same as 0.0000000000000000000000017 grams. This is ...
user avatar
3 votes
0 answers
48 views

How can I visualize the oxygen nuclear charge density?

Oxygen has 8 protons and 8 neutrons. Based on the nuclear shell model, protons should pair with anti-parallel protons to create singlet spin states, and neutrons should similarly pair with anti-...
user avatar
  • 996
0 votes
0 answers
45 views

Special relativity particle creation

A photon hits a proton that is at rest (In the lab system) which creates a pion, so now there are only the proton and pion. The question is what minimal energy can you give a photon such that this ...
user avatar
0 votes
2 answers
98 views

Is there any difference in the the electric field of a proton and an electron?

The question which I was wondering about was that how does a positive charged particle know that the other particle is positively or negatively charged? Then I thought that maybe there is some ...
user avatar
0 votes
0 answers
74 views

Why does Bragg peak exist for protons?

I am doing some research on proton therapy and I don’t understand why a Bragg peak exists. From Wikipedia, it says that A peak occurs because the interaction cross section increases as the charged ...
user avatar
2 votes
1 answer
58 views

Neutron to proton transition matrix element

I am reading the book Advances on Nuclear Physics vol 13 by J. w. Negele and Erich Vogt. On page 33, one is going to calculate a matrix element corresponding to a transition of a neutron to a proton. ...
user avatar
  • 87

1
2 3 4 5
9