What happens to neutrons in plasma state?

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    Neutrons Plasma State
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Discussion Overview

The discussion centers around the behavior of neutrons in a plasma state, specifically in the context of helium-3 when heated to plasma conditions. Participants explore the implications of heating gases to plasma and the status of neutrons within atomic nuclei.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions what happens to neutrons in helium-3 when it becomes plasma, noting that standard references do not address this.
  • Another participant asserts that heating a gas primarily strips electrons from atoms without disassociating the nucleus, implying that neutrons remain bound within the nucleus.
  • A different viewpoint explains that in typical plasmas, such as hydrogen plasma, neutrons are not prevalent, but in heavier gases, neutrons remain bound to protons due to nuclear forces.
  • It is noted that neutrons produced in fusion reactions within a plasma can escape the plasma and be absorbed by surrounding structures, while neutrons bound in nuclei remain unless specific high-energy collisions occur.
  • Participants discuss the nature of particles in plasma, clarifying that positive particles are nuclei or ions and negative particles are electrons, which can recombine and potentially leak out of the plasma.

Areas of Agreement / Disagreement

Participants express differing views on the behavior of neutrons in plasma, particularly regarding their status in atomic nuclei and the conditions under which they may be released. No consensus is reached on the implications of heating helium-3 to plasma.

Contextual Notes

The discussion does not resolve the complexities surrounding the interactions of neutrons in plasma and the conditions required for their release from nuclei. Assumptions about nuclear stability and fusion processes are not fully explored.

Optymistyk
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Let's say we have a mol of hellium-3 and we heat it up until it becomes plasma.
What happens to the neutrons? Wikipedia does not mention anything about them. It only says that "Plasma is loosely described as an electrically neutral medium of unbound positive and negative particles". Just to make sure...
 
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Optymistyk said:
Let's say we have a mol of hellium-3 and we heat it up until it becomes plasma.
What happens to the neutrons? Wikipedia does not mention anything about them. It only says that "Plasma is loosely described as an electrically neutral medium of unbound positive and negative particles".Just to make sure...

I think you missed something. When you heat up the gas, depending on the temperature, all you're doing is stripping one or more electrons from the neutral atoms. You are not disassociating the nucleus. That remains intact.

Zz.
 
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Plasmas consist of ions and electrons. Many times we just have a hydrogen plasma so there aren't very many neutrons in there. If it's a heavier gas, the neutrons are still stuck to the protons in the nucleus via nuclear forces even after the electrons are stripped away. In something like a tokamak or solar plasmas, you can have neutrons flying around that are produced by fusion reactions. They are unaffected by the electromagnetic field and generally fly in straight lines until they hit a wall and melt your tokamak.
 
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Optymistyk said:
Let's say we have a mol of hellium-3 and we heat it up until it becomes plasma.
What happens to the neutrons? Wikipedia does not mention anything about them. It only says that "Plasma is loosely described as an electrically neutral medium of unbound positive and negative particles".

Just to make sure...
Any neutron produced in a fusion plasma will simply leave the plasma and be absorbed by the surrounding structure. As ZapperZ indicated, neutrons bound in a nucleus stay in the nucleus, unless the nucleus collides with another nucleus with sufficient energy to cause a fusion reaction, or a spallation reaction.

Where matter (as opposed to anti-matter) is concerned, e.g., a hydrogen/helium plasma, the positive particles are nuclei (or ions if Z>1 and partially ionized), and the negative particles are electrons. They try to recombine, and if they do, they can leak out of the plasma unless they are ionized again.
 
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