Anti-matter and matter annihilation

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Discussion Overview

The discussion revolves around the annihilation of matter and anti-matter, specifically whether different types of particles, such as neutrons and positrons, can annihilate each other upon interaction. The scope includes theoretical considerations and particle interactions.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions if anti-matter and matter annihilate when they are not the same type, such as a neutron and a positron.
  • Another participant asserts that such annihilation does not occur but suggests that other reactions, like the interaction of a neutron and a positron leading to a proton and an electron neutrino, are possible.
  • A different viewpoint indicates that the type of particles involved in the interaction matters, noting that antiprotons and antineutrons can react with protons and neutrons in various combinations, typically resulting in pions.
  • Another participant raises the concept of "annihilation," arguing that it is often misunderstood, emphasizing that energy is not annihilated but rather transformed into other forms, such as photons in electron-positron interactions.

Areas of Agreement / Disagreement

Participants express differing views on the conditions under which annihilation occurs, with no consensus reached on the initial question regarding the annihilation of different particle types.

Contextual Notes

There are unresolved assumptions regarding the definitions of annihilation and energy transformation, as well as the specific conditions under which various particle interactions occur.

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TL;DR
Does anti-matter and matter annihilate each other even if they are not same "type" (eg. neutron and positron) and they meet each other?
Does anti-matter and matter annihilate each other even if they are not same "type" (eg. neutron and positron) and they meet each other?
 
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No.

However, that does not mean other reactions are not possible. In your particular case you can have ##n + e^+ \to p + \bar\nu_e##.
 
It depends on what meets what. Both antiprotons and antineutrons will react with both protons and neutrons in any combination, individually or in nuclei doesn't matter. The most likely result of that reaction is a couple of pions.
 
There is also the issue of what is meant by ”annihilation”. A common misconception from popular literature seems to be that particle-antiparticle pairs somehow annihilate ”to energy”. However, energy is not a thing in itself but a property of physical objects such as particles. In the most publicized case of electron-positron annihilation, the energy is converted to photons, but generally this is not the only possibility.
 

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