I thought protons couldn't decay

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    Decay Protons
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Discussion Overview

The discussion centers around the concept of proton decay, specifically addressing the confusion surrounding the decay of protons in the context of beta plus decay (B+ decay) and the conditions under which protons may decay.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant expresses confusion about the statement that protons cannot decay, referencing B+ decay as a counterexample.
  • Another participant cites Wikipedia, noting that proton decay is a hypothetical process that has not been observed and that there is currently no evidence for it.
  • A different participant clarifies that free protons cannot decay via the process described because it requires external energy, while protons bound in certain nuclei can decay due to changes in binding energy.
  • Another participant questions the understanding of proton decay by linking it to the production of positrons in laboratory settings, suggesting that isotopes with an excess of protons can undergo a decay process similar to B+ decay.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the nature of proton decay, with some asserting that protons cannot decay while others discuss conditions under which decay may occur.

Contextual Notes

There are limitations regarding the definitions of decay processes and the conditions under which protons may or may not decay, as well as the distinction between free and bound protons.

Ifailphysics
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I thought protons couldn't decay and I am pretty sure I've read it a few times as well but then with B+ Decay: p -> n + e + v

:confused:

Doesn't seem to make sense to me
 
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Right as far as I know:
Wikipedia says:
In particle physics, proton decay is a hypothetical form of radioactive decay in which the proton decays into lighter subatomic particles, usually a neutral pion and a positron. Proton decay has not been observed. There is currently no evidence that proton decay occurs.

http://en.wikipedia.org/wiki/Proton_decay for more...
 
Ifailphysics said:
p -> n + e + v

Free protons cannot decay this way because it requires an input of energy from outside.

Protons bound in [(added) some kinds of] nuclei can decay this way, because the total binding energy of the other protons and neutrons changes in such a way as to provide the necessary energy for the decay.
 
Last edited:
positron emission

Ifailphysics said:
I thought protons couldn't decay and I am pretty sure I've read it a few times as well but then with B+ Decay: p -> n + e + v

Hi Ifailphysics! :smile:

Isn't that how positrons are produced in the lab …

you take an isotope that's top-heavy in protons (most are top-heavy in neutrons instead), and just wait :wink:

p -> n + e+ + v?
 

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