What happens when a particle and an anti particle collide

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Discussion Overview

The discussion revolves around the collision of particles and antiparticles, exploring the implications of such interactions, particularly in terms of energy conversion and the types of particles produced. Participants examine theoretical concepts, practical implications, and the nuances of particle physics related to annihilation events.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that when a particle and its antiparticle collide, they convert into energy, which can create other particles, provided they are not too heavy and have sufficient interaction strength.
  • Others argue that the concept of "pure energy" is misleading, as energy must be carried by particles, and the collision results in energy that can be distributed to newly created particles.
  • A participant mentions that particles and antiparticles do not necessarily have to have opposite charges or be different types of particles, suggesting a broader interpretation of annihilation events.
  • It is noted that low-energy collisions between positrons and electrons typically produce photons, while nucleon-antineutron interactions can yield a wider variety of particles due to multiple interaction fields.
  • Some participants discuss the implications of mass-energy equivalence (E=mc²) and how the energy released in annihilation can warp spacetime, depending on the distribution of that energy.
  • Concerns are raised about the rarity of certain particle formations, such as neutrinos, in low-energy annihilation events, while high-energy collisions could produce a broader spectrum of particles.

Areas of Agreement / Disagreement

Participants express a range of views on the nature of particle-antiparticle collisions, with no clear consensus on the implications of energy conversion or the specifics of particle production. Disagreements exist regarding the definitions and interpretations of energy and matter in these contexts.

Contextual Notes

Some discussions highlight the limitations of current understanding, such as the dependence on energy levels for particle production and the complexities of interactions between different types of particles.

  • #31
Um - as interesting as working out how many atoms there are in etc etc isn't it a bit off topic? I intended my statement to be an absurd understatement :) Even attempting to manufacture, without bothering to contain, the mere 1g that was my example would be silly.
 
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  • #32
mfb said:
Volume is not a meaningful quantity here - most of the matter is very thin interstellar plasma of variable density, and the remaining part is mainly plasma in stars. Just a small fraction is solid.

How to estimate the matter density? Mainly: observe it. The total amount of matter is then given by a multiplication with the size of the observable universe.

That's precisely the point I was trying to make.
 

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