Fission vs Cluster Decay: What is the Difference?

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Discussion Overview

The discussion revolves around the definitions and distinctions between "fission" and "cluster decay," particularly in the context of nuclear reactions involving isotopes like Be-9. Participants explore the criteria that classify a reaction as fissionable and the implications of neutron speed in these processes.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions the definition of "fission" and whether Be-9 is classified as fissionable, particularly under the influence of fast versus slow neutrons.
  • Another participant mentions a rivalry between fission and fusion proponents, suggesting that some fusion reactions might be considered fission.
  • It is asserted that fissionable nuclides absorb neutrons and split into smaller nuclides, with a claim that Be-9 is not fissionable.
  • A participant reiterates the reaction involving Be-9 and asks if it qualifies as fission, emphasizing that the classification may depend on definitions.

Areas of Agreement / Disagreement

Participants express differing views on the classification of Be-9 and the definitions of fission and cluster decay, indicating that multiple competing views remain without a clear consensus.

Contextual Notes

The discussion highlights ambiguities in definitions and the role of neutron speed in classifying reactions, which may depend on specific contexts or interpretations.

snorkack
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What is defined as "fission"?
Isotopes that undergo "fission" under influence of fast neutrons, though not slow neutrons, are classified as "fissionable". Is Be-9 fissionable?
What is the dividing line between "fission" and "cluster decay"?
 
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I have a group of nuclear engineering friends, and there is always rivalry between the fission folks and the fusion folks. The fission folks are fond of pointing out that the much studied aneutronic fusion reaction p+B11->3α should really be considered fission!
 
Speed of neutron does not define fissionable. Fissionable usually refers to a nuclide absorbing a neutron and splitting up in (usually) two smaller nuclides plus debris (neutrons, etc.). Be-9 is not fissionable.

https://en.wikipedia.org/wiki/Cluster_decay
 
mathman said:
Fissionable usually refers to a nuclide absorbing a neutron and splitting up in (usually) two smaller nuclides plus debris (neutrons, etc.). Be-9 is not fissionable.
Be-9+n=2α+2n
Common reaction. Is it fission?
 
snorkack said:
Be-9+n=2α+2n
Common reaction. Is it fission?
It is a matter of definition.
 

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