What is the nature of the residual strong force?

In summary: For example, the strong force between nucleons is about 100,000 times stronger than the residual force between protons.
  • #1
ChaseRLewis73
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Reading about the strong force and the residual strong force I'm a bit confused about the interaction. Largely it keeps mentioning it the result of particle exchange and mentions that it has infinite distance, but that the residual strong force doesn't have infinite distance. However, it doesn't really explain that well. Why is that? Is the residual strong force something like Van der Waals effects within hadrons?

Also if it is a particle interaction does that mean it occurs only between two particles at once in a highly dynamic manner (switching between all those around it)? Or is the residual strong force a field force like EM or gravity? Just much steeper cutoff.

Also any good particle physics books?
 
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  • #2
Reading up on Quantum Chromodynamics may give you the answers you want. Also Yang-Mills Quantum Field Theory.
 
  • #3
ChaseRLewis73 said:
Is the residual strong force something like Van der Waals effects within hadrons?

Yes. To make the analogy more explicit, we could say that even though atoms are electrically neutral, the "residual electromagnetic force" can bind them together into molecules. But this residual force falls off quite quickly. The usual Coulomb force falls off like 1/r^2, but the residual attraction falls off like 1/r^6 (I think). Similarly, the strong force can bind nucleons into nuclei even though nucleons have no strong-force charge. However, while the usual strong force between quarks falls off like 1/r^2 + a constant, the residual force between nucleons falls off like e^(-r/r0)/r, where r0 is a characteristic length scale (about 10^-15 meters).

ChaseRLewis73 said:
is the residual strong force a field force like EM or gravity? Just much steeper cutoff.

Sort of. Actually, electromagnetism only looks like a "field force" at long distances: at short distances we need to describe it in terms of particles (photons). The same is probably true of gravity but we can't probe at short enough distances to confirm that. For the strong force, we pretty much always have to talk about particles, because the force does not extend far enough for there to be much long-distance physics to talk about. Note that the above discussion of how the strong force falls off with distance is implicitly a field-ish concept, and should therefore be taken with a lot of salt.
 
  • #4
In terms of exchange particles, the strong force is mediated by gluons. It has infinite range like the electromagnetic force but in contrast to it, gluons themselves are charged and therefore can not spread through all of space. They always confine quarks and themselves into bound states, the hadrons.

The residual strong forces that act in between these hadrons can be thought of as mediated by other hadrons. There are various models to describe this in detail, but roughly since hadrons are always massive, the range of the interaction will fall off with the inverse mass of the hadron that is exchanged.
 

1. What is the strong force?

The strong force, also known as the strong nuclear force, is one of the four fundamental forces of nature. It is responsible for holding together the nucleus of an atom by overcoming the repulsive force between positively charged protons.

2. How does the strong force work?

The strong force is mediated by particles called gluons, which act as the "glue" that holds quarks together inside protons and neutrons. These particles are constantly exchanged between quarks, creating a strong attractive force that binds them together.

3. How strong is the strong force?

The strong force is the strongest of the four fundamental forces, but it only operates on a very small scale within the nucleus of an atom. It is approximately 100 times stronger than the electromagnetic force and 10,000 times stronger than the weak force.

4. What is the role of the strong force in nuclear reactions?

The strong force is responsible for the stability of the nucleus and plays a crucial role in nuclear reactions such as fusion and fission. In fusion, the strong force overcomes the repulsive force between two positively charged nuclei, allowing them to merge and release energy. In fission, the strong force is responsible for holding together the nucleus of an atom until it becomes unstable and splits apart.

5. How is the strong force related to the concept of quarks?

The strong force is intimately connected to the concept of quarks, which are the building blocks of protons and neutrons. The strong force acts on quarks to hold them together, creating the stable particles that make up the nucleus of an atom. Without the strong force, quarks would exist independently and atoms would not be able to form.

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