Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.)

0
votes
0answers
12 views

What is the upper limit for the size of an atom?

I read an article saying a Israeli scientist had discovered the heaviest necleus with 122 protons and 170 neutrons and found it in a sample of purified thorium, I like to know if there is any laws of ...
0
votes
0answers
7 views

In Geant4 simulation the eLoss and msc parameters only for electrons or for all the particles?

/process/eLoss/StepFunction /process/eLoss/binsPerDecade like kinds of parameters only for electrons or all the particles (photon,proton and etc.). how to find the other particle information in ...
1
vote
0answers
28 views

Stability in Nuclear Shell Model

As far as I understand , a particular sub-shell is filled with either protons or neutrons, $2*(2l+1)$ number of them, and never both together since protons and neutrons fill up levels separately in ...
0
votes
3answers
43 views

formation of atomic nuclei from nucleons

What holds the nucleus together? In a nucleus there are several protons, all of which are positive. Why don't they push themselves apart? It turns out that in nuclei there are, in addition to ...
0
votes
0answers
42 views

Is there a mass spectrometer software that can measure the mass of a proton

I spent a lot of hours looking for mass spectrometer software (or Cathode-ray simulator) that can measure the mass of a proton or any sub atomic particle. Until now I only found software that work on ...
3
votes
2answers
366 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?
2
votes
1answer
120 views

Does a proton bend spacetime?

Protons have mass and as a result of einstein's field equation dictate that the spacetime is no longer flat. But yet I find in most Quantum Field Theory books the Minkowski flat spacetime metric is ...
1
vote
1answer
65 views

Is a nucleus a collection of quarks or a collection of neutrons and protons? [duplicate]

I do not much about particle physics. But people say that neutron and proton are composed of quarks, and in turn a nucleus is composed of neutrons and protons. Therefore, the question is, is this ...
0
votes
1answer
57 views

Collision of a photon with a quasi-free particle

What is a quasi-free proton? How does the wavelength of a photon change when it collides with a quasi-free particle, e.g. a quasi-free proton?
1
vote
2answers
62 views

Nuclear Fusion Proton-Proton Chain

When hydrogen nuclei are able to overcome the coulomb forces, two protons collide. As a result, one of them decays into a neutron and a positron and electron neutrino are emitted. However, isn't mass ...
3
votes
0answers
47 views

Angle between velocities: Elastic collision question in 3D

I have been given a scenario of a proton (particle 1) travelling with u1 = 3î+ 4j–6k and a Helium-3 nucleus (particle 2) travelling with u2= 3î+ 4j–2k. The two particles collide and the proton (...
-4
votes
1answer
43 views

In a quantum state, Maximum how many protons & neutrons can exist?

This is in reference to the statement I have read in a book i.e., " each quantum state can contain at the most two protons (with opposite spin) & two neutrons (again with opposite spin)". So what ...
28
votes
6answers
6k views

What is the experimental evidence that the nucleons are made up of three quarks?

What is the experimental evidence that the nucleons are made up of three quarks? What is the point of saying that nucleons are made of quarks when there are also gluons inside it?
0
votes
0answers
26 views

Electrostatic force between two grains of sand with unbalanced charge placed 30 meters apart

Quote from The Feynman Lectures on Physics Volume I: To give an idea of how much stronger electricity is than gravitation, consider two grains of sand, a millimeter across, thirty meters apart. ...
0
votes
1answer
30 views

High spin for $Δ^{++}$ resulting from angular momentum of pion in relation to proton

When a pion (Spin 0) collides with a proton (Spin 1/2) the result can be a Δ++ (Spin 3/2). When I tried to look up how the resulting Spin is possible, I came about an answer I do not understand. It ...
2
votes
1answer
48 views

Unstable vs. stable nuclei plotted on a graph

The enclosed graph shows the number of Protons on the x-axis (Z), and the number of Neutrons on the y-axis for all elements (N). Stable combinations are marked by black squares, whereas unstable ones ...
0
votes
2answers
85 views

Calculating the velocity of a proton through Relativity Theory

I was asked to calculate the velocity of a proton through Relativity Theory, with the following information given: -the Total Energy of the proton is 1,500 MeV -the resting mass ($m_0$) of the ...
4
votes
1answer
128 views

How to “build” a proton

Sabine Hossenfelder in her column The End of Theoretical Physics As We Know It made the following statement: For example, we have a perfectly fine theory that describes the elementary particles ...
1
vote
1answer
44 views

How are exchange terms in phenomenological nuclear potentials related to the exchange of nuclear force carrirer particles?

Consider a proton-neutron system. Phenomenlogical nucleon-nucleon potentials contain exchange forces terms (Majorana, Bartlett and Heisenberg terms), which are linked to the symmetry of the state w.r....
1
vote
4answers
124 views

How the Heisenberg principle holds for protons?

Does this principle holds for protons since their position is, in a manner of speaking, known and they are also assumed to be stationary at every popular physics book that I have read, including the ...
13
votes
2answers
1k views

In which experiment did protons seem to consist of infinite amount of quarks?

In this video Richard Feynman is telling that in some experiment it seems that the proton should consist of infinite amount of quarks. What is this case he's mentioning? Is it solved now?
2
votes
2answers
138 views

A proton's weak charge is .0719. Is this dimensionless? A ratio?

A recent piece of major news in the physics world is that the proton's weak-force charge was measured to be .0719. Is that a ratio? A dimensionless number, with no units? The articles I read ...
0
votes
1answer
72 views

Direction of Electron Field for Moving Proton

I had the following problem: A proton is moving to the right at constant speed v and enters a region with uniform magnetic and electric fields. It continues to move in a straight line. The ...
2
votes
2answers
123 views

Where is the proton mass coming from?

I always thought that the mass of a proton would simply be the mass of the three separated quarks plus their binding energies. Nevertheless, I was once discussing with one of the developers of RICH ...
0
votes
2answers
73 views

Creating isotopes by shooting neutrons into an unstable nucleus [closed]

I've been doing a lot of amateur research lately (youtube videos) on particle physics and find it all really interesting. I'm also a crazy alien conspiracy theorist who believes in the whole "Bob ...
0
votes
1answer
29 views

Seperating Charges in a Cell

Sorry for not being detailed for my question here but how do charges seperate in a cell and when the electrons are pumped out of the battery does it return and become positive ? Yet again sorry if I ...
5
votes
0answers
98 views

Quark intrinsic angular momentum and the Proton Spin Crisis

According to recent results regarding the "Proton Spin Crisis", apparently only about 30% of the total angular momentum of the proton comes from the intrinsic angular momentum of its constituent ...
13
votes
2answers
1k views

What is the reason for the shift in balance between neutrons and protons in the early universe?

In the book of The First Three Minutes by Weinberg, on pages 106-107, it is stated that SECOND FRAME. The temperature of the universe is 30,000 million degrees Kelvin [...] The nuclear particle ...
3
votes
1answer
101 views

How do we know that electrons are moving in an electric current?

We are learning about the Hall Effect in high school, but what confused us was that hypothetically if both protons and electrons were moving, but electrons moved much faster, then wouldn't there still ...
0
votes
2answers
387 views

Why is the proton anti-proton annihilation and pair production asymmetric?

This is a follow up question to this question. The process of annihilation is very well explained. However while the annihilation is a step-by-step process the pair production does not seem to follow ...
0
votes
0answers
55 views

What's the mass? [duplicate]

Let's perform two simple calculations and then formulate the relative questions. By checking Wikipedia, one can know the mass of neutron and proton: $$M_{neutron}=939.5654133(58)MeV/c^2=1.674927471(...
-1
votes
1answer
75 views

About electron and proton

Can electron stick ''glue'' with proton if they collide with each other? What will happen if electron collide with pion? Can it glue with it or not?
11
votes
1answer
225 views

How accurately is it known that protons have the same charge as electrons?

Recently, I claimed that the proton and electron have the same charge, and that this has been experimentally verified up to $1$ part in $10^{26}$. This belief was naively based on CODATA's 2014 ...
1
vote
2answers
195 views

What is a proton gas?

I was studying nuclear fusion reactions, then suddenly came nuclear fusion reactions of two protons. My book says when two protons in a proton gas fuse then something something happens. I understood ...
-1
votes
1answer
55 views

Is there any way to attract or push away a proton?

Like an electron that can be attracted by positive charge (or less negative charge), is there any way to make a proton move by attraction?
3
votes
2answers
444 views

Why is the proton the only stable hadron?

The title pretty much explains the question, but I've always thought that it'd be a neutron because of its 0 charge.
1
vote
0answers
65 views

What percent of the mass the proton comes from its electric field energy density?

How much heavier would the proton be with respect to the neutron if the up quark and the down quark had the same mass? How much does the electric field energy density of the proton contribute to its ...
4
votes
2answers
460 views

Why can't we harness the energy from neutron + protium = deuteron reaction?

The answer to this physics se question, established that 2.2Mev (Mega electron volts) of energy is emitted as a gamma ray photon when the hydrogen atom nucleus oka protium absorbs a slow moving free ...
0
votes
2answers
108 views

Neutron Creation Machines [closed]

My question is specific "what methods are there to generate free neutrons"? With a few aside queries and confirmations of undertanding Now as I understand free protons are far easier to create than ...
-7
votes
3answers
187 views

What is the true nature of neutrons? [closed]

I have been spending time thinking about atoms with an open mind. In general, I am trying to think of atomic and molecular physics in terms of pure magnetism. I am going to explain my train of thought ...
0
votes
2answers
157 views

How does the collision of two protons forming a hydrogen-2 atom produce energy if a neutron is more massive than a proton?

Wouldn't the transformation of a proton to a neutron require energy since the neutron is more massive?
0
votes
1answer
92 views

Why proton and neutron in an atom don't spread out like electron cloud?

Proton and neutron are very tiny particles and should follow the heisenberg uncertainty principle and spread out like the electron cloud, which also apply to the quarks that made up the proton and ...
0
votes
1answer
73 views

Why charged particle interaction cross section increases as the particle's energy decreases?

I'm tying to gain a little more understanding of the dose deposition profile of high energy (~100MV) protons in matter (depth dose curve - medical physics). I understand that the Bragg peak occurs ...
4
votes
1answer
147 views

What's the difference between a pentaquark and a proton?

The proton isn't just 3 quarks bound by gluons: From here, a proton also has an uncountable lot of sea quarks, antiquarks and gluons and that The standard shorthand, “the proton is made from two up ...
-1
votes
2answers
2k views

Why is the direction of the electric field that will balance the weight of an electron downward, and a proton upward?

Here is the full question from problem, What are the magnitude and direction of the electric field that will balance the weight of the following? An electron A proton For an electron/proton we use ...
0
votes
1answer
74 views

Is there any electrostatic waves for electrostatic force like the gravitational waves for gravity?

If sun suddenly disappears then it will take 8 minutes for earth to move out of its orbit due to the presence of gravitational waves. What happens if proton in an atom suddenly disappears, will the ...
2
votes
2answers
473 views

How fast can you spin a proton or electron without breaking it?

If you spin a single nucleus containing multiple nucleons fast enough it will fly apart. Is there a speed limit to a spinning proton or electron assuming it's held at a fixed location with a strong ...
1
vote
0answers
22 views

How can you separate sub atomic particles and manipulate them? [duplicate]

Say, in Large Hadron Collider how can people separate a proton from an atom and then accelerate it and what is even more miraculous to collide it with another proton? It sound like impossible. ...
19
votes
3answers
3k views

Proton: 2 up, 1 down quark, Neutron: 2 down, 1 up, how can Neutron: proton + electron?

I imagine that there is a pretty simple answer to my question, but I have just never gotten it straight. If a proton is comprised of two up quarks and a down, and neutrons are comprised of two down ...
1
vote
2answers
140 views

Determining mass radius and charge radius of electrons

First the mass radius problem: Why can't the mass radius of electrons be determinded by shooting neutral particles on it. Similar to Rutherford's gold model only a bit more sophisticated. Secondly ...