Strong Nuclear Force and Electrostatic Force

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Discussion Overview

The discussion revolves around the comparison between the strong nuclear force and the electrostatic force, particularly in the context of nuclear stability and decay. Participants explore how these forces interact as atomic nuclei increase in size, leading to the breakdown of larger atoms into smaller ones. The conversation includes theoretical aspects of these forces and their implications for nuclear decay processes.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants note that while the strong nuclear force binds protons and neutrons, the electrostatic force of repulsion becomes dominant in larger nuclei, leading to instability.
  • One participant suggests that the electromagnetic force follows an inverse square law, whereas the strong force decreases exponentially, which may explain why the strong force becomes less effective at larger distances.
  • Another participant introduces the weak force as a factor in nuclear decay, indicating that it may counterbalance the strong force as the number of protons and neutrons increases.
  • There is a mention of different types of nuclear decay, including beta emission and alpha emission, with some decay processes being related to the strong force.
  • One participant explains the concept of "saturation" in the strong force, suggesting that it only acts on nearby nucleons, while the electromagnetic force increases with additional protons, contributing to nuclear instability.
  • Another point raised is the short range of pions, which mediate the strong force, leading to a rapid drop-off in the residual strong force potential at larger distances between nucleons.

Areas of Agreement / Disagreement

Participants express differing views on the relative strengths and behaviors of the strong nuclear force and the electrostatic force, indicating that there is no consensus on the primary reasons for nuclear instability in larger atoms.

Contextual Notes

The discussion includes assumptions about the nature of forces and their interactions, as well as the implications of force behavior at different scales, which remain unresolved.

garytse86
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there are two forces, the nuclear force which binds protons and neutrons together. However as the size of the nucleus gets larger the electrostatic force of repulsion in the nucleus overcomes the strong nuclear force. so larger atoms breakdown to form smaller atoms, why does the electrostatic force dominate the strong nuclear force. Yes, the electrostatic force will increase in strength because of the increasing number of protons, but surely wouldn't the strength of strong nuclear force increase as well?
 
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I'm not sure if this is the entire answer, but the electromagnetic force obeys an inverse square law, while the (derived, i.e. between nucleons) strong force falls off like an exponential over square law. In other words the latter falls off faster.
 
It is the weak force that is responsible for nuclear decay. The weak force may increase as an atom increases in proton or neutron number in a fashion that, put together with the growing electro-magnetic potential, counters the exponential potential of the residual strong force. This necessitates nuclear decay.
 
There are several types of nuclear decay. The weak force is related to beta emission (neutron becomes proton). Other types of decay, which are related to the strong force, are alpha emission (He4 nucleus emitted) and spontaneous fission (very heavy nucleus breaks up into at least two smaller nuclei and several neutrons). I believe the original question (strong force versus electromagnetic) had to do with the latter.
 
To answer the original question, nuclear force has a property of "saturation" related to the short-range nature of it mentioned earlier (classical analogy: if you have many marbles in a sack and ask a question how many marbles will any given marble touch at one time, the answer will always be the same -- only the once in its visinity, regardless how many marbles are in there). In other words, due to saturation, strong force acts on nearby nucleons only, while electromagnetic force grows with addition of new protons leading to the instability of very large-mass nuclei.
 
Yes, this is due to the short life-time (and hence short range) of pions which mediate between nucleons. The residual strong force potential drops off very quickly between nucleons at increasing distances.
 

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