# strong force

1. ### A What are nuclear forces?

There are some theories, but I am looking for one that have proven using test data and can be placed in an excel table or a program with coefficients for some common reactions. Do anybody knows a paper with tables or formulas? I found this with a fortran code that is recent...
2. ### I Strong force as exchange of mesons, or of quark and antiquark

The (residual) strong force between nucleons can be desribed as - The exchange of a meson (from a nucleon to the other), as in picture b) - The exchange of a quark and an antiquark: in picture a) one nucleon "gives" a quark and receive an antiquark and it's the opposite for the other I do...
3. ### I Measuring characteristic time of strong and weak interaction

Consider a scattering between two particles a and b that produces two particles c and d: d is stable, while c decays in two other different particles e and f. The first interaction is by strong force (time of interaction $t_1\sim 10^{-23}s$, which is also the time of generation of c and d)...
4. 5. ### I Is the strong nuclear force stronger than the weak force?

I've heard that the weak nuclear force is stronger than the electromagnetic force at distances of 10^-18 m. I've also heard that the strong force becomes repulsive at a distance of 0.7 fm. So if two quarks got to a distance of <<10^-18 m which force would win, the strong force or the weak force?
6. ### I Why must the mediator of the strong force be heavy?

I'm reading Griffith's Introduction to Elementary Particles and it says that when Yukawa proposed his theory of the strong force, it was an indication that the meadiator of that force must be a heavy particle since the force is a short ranged force. Why is that the case? I cannot get the...
7. ### A What is the strength of the strong force in N units

In addition. 1. what is the presure of this force (alternativly wat is the efferctiv area it is acting on?....nucleai corrss section area?).
8. ### I Why are gluons considered to be elementary particles?

Gluons are often depicted as fundamental particles in the Standard Model. But in looking at their mechanism, it seems they are not really fundamental particles in the sense that they are fundamental, indivisible, building blocks. They are mesons- a composite quark-antiquark pair, where their...
9. ### A Colour singlet states

I read that hadrons are in colour singlet state and that gluons are not and that the colour singlet gluon is forbidden for the reason of making strong force a long range force otherwise (and that SU(3) has 8 generators and thus 8 gluons) but my question is: are mesons in a colour singlet state...
10. ### I Range of Fundametal Forces

How come gravity and electromagnetism have an infinite range, while the strong nuclear force dies out quickly? I understand that the weak force's bosons, the W+, W- and Z (neutral), have relatively large mass, and decay quickly, while the photon and the graviton (theoretical carrier of gravity)...
11. ### What is the reason for mass defect in a nuclide?

I may be misguided here but to my understanding, separate nucleons have a higher mass altogether than the combined nucleus as the potential energy gained from being separated (in the field of the strong force) is being manifested in more mass. If this is true, and if it's not I'd like to know...
12. ### How does protons has mass and not pions?

hi, i've heard that protons has most of their mass from their electromagnetic and strong interactions between their quarks, but specifically, how does that make mass? and if so, what is intrinsic mass then? and pions has 2 quarks and strong and electro interactions, why doesn't it has mass...
13. ### What is the entropy of weak and strong force?

What is the entropy of weak and strong force? Can we determine their entropy? If so, I would like to know the formula of determining this. Thanks:wink:
14. ### Why is this decay allowed and another not?

Consider $\Sigma^0 \rightarrow \Lambda + \pi^0$. (Not Allowed) According to griffiths, this strong interaction is not allowed by 'Conservation of Energy'. I'm not sure why, as this simply shows an up and anti-up quark coming together, producing a gluon, where mass of gluon is mass of up and...
15. ### What is "Strong Force"?

Please explain how is exactly strong force caused, I've come across various answers but haven't yet received a complete answer. What is the nature of the strong force? P.S: If this is the wrong thread, Please RE-LOCATE and do not remove please. :)
16. ### Quarkonium: General Information

So I've been set a computational problem regarding applying the Shroedinger equation to quarkonium and I'm just trying to do some research around the subject because it's nothing like I've ever covered before and quite fascinating. There's quite a few questions that I can't find answers to...