Why do gamma rays accompany other kinds of decay?

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Discussion Overview

The discussion revolves around the emission of gamma rays in relation to alpha decay processes in atomic nuclei. Participants explore the reasons behind the emission of gamma rays following alpha particle emission, considering concepts of nuclear stability and energy conservation.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions why gamma rays are emitted if the alpha particle emission was intended to stabilize the atom.
  • Another participant suggests that if the masses of the daughter particles do not exactly equal the mass of the parent atom, the energy difference is typically released as a gamma ray.
  • A later post reiterates the previous point about mass conservation and energy release, seeking further clarification on the mechanism.
  • Another participant proposes that the nucleus may be left in an excited state after alpha emission, leading to gamma ray emission as it transitions to a lower energy state.

Areas of Agreement / Disagreement

Participants express varying levels of understanding about the mechanisms behind gamma ray emission, with some points being reiterated for clarification. The discussion does not reach a consensus on the reasons for gamma ray emission following alpha decay.

Contextual Notes

The discussion includes assumptions about nuclear stability and energy conservation that are not fully explored. There is also a lack of detailed explanation regarding the conditions under which gamma rays are emitted.

LogicalAcid
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I read that gamma rays are usually emitted by the nucleus of an atom after it emits an alpha particle, but have been wondering: If the alpha particle being emitted was meant to stabilize the atom, and should have, why does the nucleus need to emit such high energy waves?
 
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Unless the masses of the daughter particles (alpha + whatever) add up exactly to that of the parent, for conservation the difference will generally end up in the form of energy, usually a gamma ray.
 
mathman said:
Unless the masses of the daughter particles (alpha + whatever) add up exactly to that of the parent, for conservation the difference will generally end up in the form of energy, usually a gamma ray.

why is this?
 
The left-behind nucleus could be in an excited state. It may then emit gamma rays as it decays to its ground state.
 

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