Limitations of fission decay paths

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    Decay Fission
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Discussion Overview

The discussion revolves around the factors influencing the products of fission reactions, specifically the isotopes produced when a neutron interacts with a nucleus. Participants explore the implications of mass numbers and energy considerations in these reactions.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about additional factors, beyond mass numbers, that determine the isotopes b and c resulting from the fission of isotope a.
  • Another participant notes that the number of protons must remain constant and emphasizes the importance of energy feasibility in the fission process.
  • A participant questions whether the energy required for fission is of the same order of magnitude as the energy released, suggesting that heavy nuclides may require significant energy to split.
  • It is mentioned that some isotopes can undergo fission with thermal neutrons, while the fission of uranium and similar nuclei typically releases around 200 MeV.

Areas of Agreement / Disagreement

Participants express various viewpoints regarding the energy considerations and the conditions under which fission occurs, indicating that multiple competing views remain without a clear consensus.

Contextual Notes

Limitations include the dependence on specific isotopes and the energy thresholds required for fission, which are not fully resolved in the discussion.

NotASmurf
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Hey all,

For a fission reaction of the type neutron + a -> b + c, where a,b,c are isotopes and the sum of b + c 's mass numbers is a's mass number + 1. What else other than mass number factors into what b and c can be given a?
 
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The number of protons has to stay constant, and the overall reaction has to be possible in terms of energy.

Often fission releases neutrons in addition to the large fission products.
 
mfb said:
possible in terms of energy
Doesn't fission of heavy nuclides use roughly (same order of magnitude) MeV to split?
 
Some of them can be fissioned with thermal neutrons (meV), and fission of uranium and neighbor nuclei typically releases ~200 MeV.
 

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