Why Does Co-60 Decay to an Excited State of Ni-60 and Emit Two Photons?

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Discussion Overview

The discussion centers on the decay process of Cobalt-60 (Co-60) into an excited state of Nickel-60 (Ni-60), specifically exploring the reasons behind this decay pathway and the subsequent emission of two photons during transitions to the ground state. The scope includes theoretical aspects of nuclear decay and selection rules in quantum mechanics.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions why Co-60 decays to an excited state of Ni-60 rather than directly to its ground state.
  • Another participant introduces the concept of "selection rules" and asks for clarification on their application in this context.
  • A participant acknowledges knowledge of selection rules, specifically mentioning ΔJ=±1,0, but expresses confusion about their relevance to the decay process.
  • Further, a participant notes the total angular momentum (J) values for Co-60 and Ni-60, questioning why Ni-60 cannot have a J value of 5 like Co-60 and why the transition occurs with ΔJ=-1 instead of ΔJ=0.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the selection rules and their implications for the decay process. The discussion remains unresolved with multiple questions and uncertainties about the transitions involved.

Contextual Notes

Participants have not fully explored the implications of selection rules on the decay process, and there are unresolved questions regarding the specific transitions and angular momentum states involved.

Raz91
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Hello,

my question is :
C60 ---> Ni60+e-+anti-neutrino

why does Co60 decay to an excited state of Ni60 and not directly to its ground state?
and why does the Ni emite two photons (first transition from the second excited state to the first excited state and from the first excited state to the ground state) and not directly to its ground state?

thank you! :)
 
Last edited:
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Do you know what "selection rules" are?
 
yeah i know

i know that ΔJ=±1,0

Just don't understand how does it applied here ...
 
as i saw - Co60 has J=5 and Ni J=4
so why Ni can't be with J=5 same as Co ?
why the transition of ΔJ=-1 is taking place and not ΔJ=0?

thank u :)
 

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