Can Neutrons Collide? - Physics Q&A

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Discussion Overview

The discussion centers on the nature of collisions between neutrons, particularly focusing on whether neutrons, being neutral particles, can collide and what interactions occur during such events. The scope includes conceptual understanding and theoretical implications related to particle physics and nuclear forces.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant questions whether neutrons can collide without charge interactions, pondering if they would pass through each other or if such collisions contribute to the understanding of matter.
  • Another participant suggests looking into neutron stars and degenerate matter as relevant contexts for understanding neutron interactions.
  • A later reply indicates that colliding neutrons would scatter, but the probability of such a reaction is small, with neutrons more likely to interact with atomic nuclei and be absorbed. It also mentions that free neutrons will eventually decay.
  • Another participant notes that neutrons possess magnetic moments, leading to magnetic forces between them, and highlights the presence of a nuclear force when they are very close to each other, which is crucial for holding atomic nuclei together.

Areas of Agreement / Disagreement

Participants express differing views on the nature of neutron collisions and the forces involved, indicating that multiple competing perspectives remain without consensus on the fundamental nature of these interactions.

Contextual Notes

The discussion touches on complex interactions that may depend on specific conditions, such as proximity and the environment in which neutrons exist, which are not fully resolved in the conversation.

jpulizari
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Sorry, this is probably a dumb question but I am new to physics so forgive my ignorance. I learned in class that when a person touches something, or any two objects touch each other for that matter, the force interaction is actually due to the electrons repelling each other. So I wondered what would happen if two particles with no charge (such as neutrons) collided. Would they actually collide without having opposite forces interacting? Would they pass through each other? It makes me wonder what matter actually is if there is no collision. I asked my professor this question but he didn't have an answer. Any help would be appreciated.
 
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look up 'neutron star' and 'degenerate matter'.
 
jpulizari said:
Sorry, this is probably a dumb question but I am new to physics so forgive my ignorance. I learned in class that when a person touches something, or any two objects touch each other for that matter, the force interaction is actually due to the electrons repelling each other. So I wondered what would happen if two particles with no charge (such as neutrons) collided. Would they actually collide without having opposite forces interacting? Would they pass through each other? It makes me wonder what matter actually is if there is no collision. I asked my professor this question but he didn't have an answer. Any help would be appreciated.
Colliding neutrons would scatter. However, the cross-section or probability of such a reaction would be very small, and each neutron would be more likely to collide with an atomic nucleus and be absorbed. Otherwise a free neutron will eventually decay.

Stellar environments like a neutron star are well beyond our experience and capabilities on Earth (manmade) systems.
 
There are forces between two neutrons besides the Coulomb force. They have magnetic moments, so there is a magnetic force between them, similar to the force between two compass needles. There is also a "nuclear force between them when they get within about 1 fm of each other. This nuclear force is what holds nuclei together.
 

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