Spontaneous endothermic nuclear reaction?

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Discussion Overview

The discussion revolves around the possibility of spontaneous endothermic nuclear reactions, particularly focusing on electron capture and related processes. Participants explore theoretical frameworks, examples, and definitions related to these concepts, including inquiries about cold fission and fusion.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions the existence of spontaneous endothermic nuclear reactions and seeks examples of stable products from electron capture.
  • Another participant clarifies the terminology, suggesting that "cold fusion" might be the intended term instead of "cold fission."
  • A participant proposes a theoretical framework for spontaneous endothermic reactions, noting the energy requirements for such processes and the improbability of occurrence at room temperature.
  • There is a discussion about the definition of "spontaneous," with one participant providing a dictionary definition and another questioning the existence of beta decays that emit less than 1 keV.
  • A participant mentions Rhenium 187 as a beta decay example that emits 2.6 keV, expressing uncertainty about the feasibility of reversing this process.
  • Another participant seeks clarification on whether heating the beta decay product could lead to a spontaneous reaction.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the existence of spontaneous endothermic nuclear reactions and the specifics of beta decay emissions. There is no consensus on the feasibility of the proposed processes or the definitions being discussed.

Contextual Notes

Participants highlight limitations in available examples and data regarding low-energy beta decays, as well as the ambiguity in the term "spontaneous" as it applies to nuclear processes.

pancake
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is such a thing possible? I am curious to know if this could/does exist.

An alternative would be if someone gave an example of a reaction where electron capture occurs and the product ends up being stable enough to not decay into anything further.

Thanks

(btw, does cold fission exist? If so, is there an example/article/video about it?)
 
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What is cold fission?

You mean cold fusion right?
 
To have a spontaneous endothermic reaction, say,

A + e = B

the difference between internal energies of B and A has to be greater than zero (or else the process is not endothermic), but smaller than the energy of the electron (or else the reaction won't go through).

This is extremely improbable at room temperature, because nuclear energy levels are measured in keV and MeV, and room-temperature electron energies are fractions of eV.

One way to think about it is to reverse the process. A forward process (endothermic electron capture) is a reverse of beta decay. If you can find an isotope that goes through a beta decay and only emits 1 keV or less in energy, you can put the process in reverse by heating the product of beta decay and eventually you'll start seeing what you want.

Makes sense?
 
To 1st poster: Fission, fusion, whichever. As long as it's cold.

And to 2nd poster, is there an example of this?
 
does anyone know an example of the stuff mentioned in first post?
 
hamster, would heating the beta decay product into the reaction be spontaneous?
 
Last edited:
Define "spontaneous".
 
Dictionary.com - Happening or arising without apparent external cause; self-generated; natural and unconstrained

btw, do you know of anything that emits only 1 keV or less when it beta decays or anywhere where I can find such information?
 
There are some tables of nuclides online, the lowest I see is Rhenium 187 that beta decays into Osmium 187 and emits 2.6 keV. I can't find any references that the inverse process is in fact possible, but it should be.

"Spontaneous" usually refers to decays, it's not commonly used for many-body interactions.
 
  • #10
I think spontaneous just means it will occur without any prodding from us.

so a < 1keV beta decay doesn't exist?
 

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