Fission vs Cluster Decay: What is the Difference?

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SUMMARY

The discussion clarifies the distinction between "fission" and "cluster decay" in nuclear physics. Fission is defined as the process where fissionable isotopes absorb a neutron and split into two smaller nuclides, typically accompanied by the release of additional neutrons. Specifically, Beryllium-9 (Be-9) is confirmed to be non-fissionable, as it does not undergo fission under neutron bombardment. The debate among nuclear engineers highlights the differing perspectives on the classification of reactions, particularly the aneutronic fusion reaction p+B11->3α, which some argue should be considered a form of fission.

PREREQUISITES
  • Understanding of nuclear reactions, specifically fission and cluster decay.
  • Knowledge of isotopes and their properties, particularly Beryllium-9 (Be-9).
  • Familiarity with neutron interactions in nuclear physics.
  • Basic concepts of nuclear engineering terminology.
NEXT STEPS
  • Research the characteristics of fissionable isotopes, focusing on neutron absorption and splitting processes.
  • Study the mechanisms of cluster decay and its differences from fission.
  • Explore the aneutronic fusion reaction p+B11->3α and its implications in nuclear physics.
  • Investigate the role of fast and slow neutrons in nuclear reactions.
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Nuclear engineers, physicists, and students interested in the nuances of nuclear reactions and the ongoing debates in the field of nuclear physics.

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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