How to turn a proton into neutron by e+p->n?

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Discussion Overview

The discussion centers on the possibility of converting a proton into a neutron through the interaction of an electron with a proton, specifically examining the reaction e + p → n. Participants explore the conditions required for this process and the underlying mechanisms involved.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the feasibility of turning a proton into a neutron by forcing an electron into the proton and asks about the necessary conditions for this to occur.
  • Another participant references a decay process where a neutron can decay into a proton, an electron, and an antineutrino, suggesting a connection to the topic.
  • A participant asserts that it is possible to convert a proton into a neutron if the electron has sufficient energy, mentioning the W^- exchange mechanism and the transformation of quarks from u to d within the same isospin doublet.
  • There is a query regarding the energy requirements for electron capture, with a focus on the conditions necessary for the reaction to take place.
  • A participant clarifies that electron capture typically involves unstable isotopes and discusses the energy balance required when an electron interacts with a free proton, estimating it to be slightly less than 0.8 MeV.
  • Another participant acknowledges the previous points and indicates a shared understanding regarding the use of electron beams on hydrogen targets.

Areas of Agreement / Disagreement

Participants express differing views on the mechanisms and conditions for the proton-to-neutron conversion, with some agreeing on the role of electron capture while others focus on the energy requirements and specific processes involved. The discussion remains unresolved regarding the exact conditions and energy thresholds needed.

Contextual Notes

There are limitations regarding the assumptions made about the processes discussed, particularly concerning the energy calculations and the specific contexts in which electron capture occurs. The discussion does not resolve the complexities of these interactions.

NERV
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how to turn a proton into neutron by e+p-->n?

Just as the topic said,is it possible to turn a proton into a neutron by forcing a electron into the proton?If it's possible,what condition is it required?
 
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n^0 \rightarrow p^+ + e^- + \overline\nu _e
 
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Actually it's completely possible provided your electron has enough energy, it will turn itself into a neutrino and the proton into a neutron (via W^{-} exchange, a u becomes a d, both quarks being in the same SU(2) isospin doublet connected by this exchange).

Note that the reaction is as interesting as its final state is daunting.
 


I know there is a way of electron capture.But,how much energy is it needed?In other words,WHAT CONDITION is the capture reaction required?
 


NERV said:
I know there is a way of electron capture.But,how much energy is it needed?In other words,WHAT CONDITION is the capture reaction required?
Electron capture usually refers to unstable isotope. It's a spontaneous atomic and nuclear process. I was referring to an electron beam on a hydrogen target. But in any case, the energy required will be given by the differences between the masses (and you can neglect the mass of the neutrino !). If you have an electron incident on a free proton, the balance is positive anyway by slightly less than 0.8 MeV.
 


Thanks a lot.Your quote was what I was answering #2,not for you ^-^.And you seems to have the same idea(to beam hydrogen targets with electrons).
 

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