Electron-Proton Collision: Annihilation and Mass Conversion Explained

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Discussion Overview

The discussion revolves around the interactions between electrons and protons, particularly focusing on the concepts of annihilation, mass conversion, and the outcomes of collisions between these particles. The scope includes theoretical considerations, conceptual clarifications, and some experimental implications.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant questions whether a proton can be destroyed by an electron during a collision and whether the entire mass of the proton can be converted to energy.
  • Another participant asserts that electrons and protons do not annihilate and cannot be destroyed, noting that protons can be broken into quark-gluon plasma, while electrons are fundamental particles.
  • It is proposed that collisions typically result in kinetic energy being converted into rest mass, leading to the creation of new heavy particles that decay into gamma radiation.
  • A participant raises a question about the definition of "destroyed," pointing out that electrons can annihilate with positrons and protons with anti-protons.
  • One participant introduces the concept of electron capture, explaining that an electron can be absorbed into a nucleus, converting a proton into a neutron, although this process is noted to be unlikely with just one proton and electron.
  • A question is posed regarding the scenario where both the proton and electron have very little kinetic energy.
  • It is suggested that with low kinetic energy, the electron would simply fall into the ground state of a hydrogen atom, indicating a preference for the electron-proton system over the formation of a neutron and electron neutrino.

Areas of Agreement / Disagreement

Participants express differing views on the nature of electron-proton interactions, particularly regarding annihilation and the concept of destruction. There is no consensus on the outcomes of collisions or the definitions being used.

Contextual Notes

The discussion includes various assumptions about particle interactions and definitions of terms like "destroyed" and "collide," which may affect the interpretations of the claims made.

Icebreaker
If an electron collides with a proton? I am told they annihilate, but can something as massive (relatively) as a proton could be destroyed by an electron? That is, will the entire mass of the proton be converted to energy?
 
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1) They don't annihilate.

2) Protons and electrons cannot be destroyed. Protons can be broken up into quark-gluon plasma, but electrons are fundamental and have no internal parts.

3) Collisions like this typically result in kinetic energy being traded for rest-mass - a lot of new heavy particles are created, which carry away the energy. The particles typically rapidly decay into gamma radiation.

- Warren
 
chroot said:
2) Protons and electrons cannot be destroyed. Protons can be broken up into quark-gluon plasma, but electrons are fundamental and have no internal parts.

Whoa, hold up, how are we defining "destroyed"? Electrons can annihilate with positrons (as can protons with anti-protons).
 
SpaceTiger,

Of course, good point.

- Warren
 
What do you mean collide? Scatter?

Electrons can be absorbed into the nucleus of atom called electron capture or K capture. This will turn one proton into a neutron with emissions of an electron neutrino.

It is called K capture because the lowest electron shell in a many electron atom is called the k shell. This will also result in X-rays when that lower orbital is filled again.

This process is greatly suppressed with just one proton and electron. Though it is still possible just unlikely.
 
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What if both the proton and the electron have very little kinetic energy?
 
With low kinetic energy the electron will just fall into the ground state of the hydrogen atom.

K capture is just an unlikely quantum event for the one proton and electron. The electron and proton are my energetically favored over the single neutron and electron neutrino.
 

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