What kind of energy is released when matter and antimatter collide?

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Discussion Overview

The discussion centers on the nature of energy released during matter-antimatter collisions, particularly in the context of cosmic rays and potential signatures of annihilation events. Participants explore theoretical implications and energy scales associated with these interactions.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants propose that ultra high-energy cosmic rays could result from matter-antimatter collisions, questioning the unique signatures of such events.
  • Others argue that cosmic rays are too energetic to be formed from matter-antimatter annihilation, citing energy scales of approximately 10^21 electron volts, which they believe exceed what can be produced from annihilation events.
  • One participant mentions that matter-antimatter annihilation primarily yields pions and some x-rays, suggesting that the energy produced is significantly lower than that of cosmic rays.
  • A participant emphasizes that while the energy from annihilation events is substantial, it is tied to the number of subatomic particles involved, indicating that individual annihilation events do not produce higher energy than the mass-energy equivalence of the particles themselves.

Areas of Agreement / Disagreement

Participants express disagreement regarding the feasibility of cosmic rays being generated from matter-antimatter collisions, with some asserting that the energy scales do not align. The discussion remains unresolved as differing viewpoints on the energy outputs and mechanisms persist.

Contextual Notes

Participants reference specific energy values and particle types, but there is a lack of consensus on the implications of these values in relation to cosmic rays and annihilation events.

ensabah6
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Could ultra high-energy cosmic rays be the result of matter-antimatter collision?

What would be a unique antimatter-matter anihilation signature should say a 10 gram rock of antimatter were to collide into a meteor?
 
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I think cosmic rays are too energetic to be formed in such a manner.

See for instance http://imagine.gsfc.nasa.gov/docs/features/topics/snr_group/cosmic_rays.html

10^21 electron volts!

Matter-antimatter annhilation will yield most of the energy in pions, some charged, some uncharged. You'll get much lower energies, I'm sure (a proton mass is only 1 Gev which is an upper limit). Cosmic rays can have about 12 orders of magnitude more energy than this.

Cosmic rays are nuclei, protons, or electrons (see above), apparently mostly protons (from the above URL) and not pions. There will also be some x-rays in matter-antimatter annhilation from the electron-positron annhiliation.
 
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pervect said:
I think cosmic rays are too energetic to be formed in such a manner.

See for instance http://imagine.gsfc.nasa.gov/docs/features/topics/snr_group/cosmic_rays.html

10^21 electron volts!

Matter-antimatter annhilation will yield most of the energy in pions, some charged, some uncharged. You'll get much lower energies, I'm sure (a proton mass is only 1 Gev which is an upper limit). Cosmic rays can have about 12 orders of magnitude more energy than this.

Cosmic rays are nuclei, protons, or electrons (see above), apparently mostly protons (from the above URL) and not pions. There will also be some x-rays in matter-antimatter annhilation from the electron-positron annhiliation.

I was thinking along the lines of say 1 kg of antimatter colliding with say 500g of matter.
 
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pervect said:
10^21 electron volts!

To put that in perspective that is ~100 Joules, roughly the energy of a baseball traveling at 120 km/h (or ~ 80 Miles/hr)

Remember that this thing is probably a proton or something of similar mass. It's just mind blowing :smile:
 
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ensabah6 said:
I was thinking along the lines of say 1 kg of antimatter colliding with say 500g of matter.

But each annihilation event is from one subatomic matter particle meeting one subatomic anti-matter particle giving of a number of high energy particles as a result. The more matter and anti-matter particle you annihilate the more high energy particles you produce, but they won't have any more energy.
 

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