Quark spatial change in nucleons & nuclear stability

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Discussion Overview

The discussion revolves around the measurement of changes in nuclear disintegration rates and gamma emissions as influenced by the distance between quarks within nucleons. It explores theoretical frameworks and experimental approaches related to quark behavior and nuclear stability.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about experiments measuring changes in nuclear disintegration rates related to quark distances in nucleons.
  • Another participant mentions deeply virtual Compton scattering as a relevant experimental approach and offers to provide references.
  • A follow-up request for references includes interest in understanding the mechanism of Compton scattering and its effects on quark positions, particularly regarding changes in nuclide half-lives.
  • It is noted that the topic is technical, with references to leading twist nuclear shadowing and quark-quark correlations in gamma emission.
  • Concerns are raised about the current theoretical limitations in predicting half-lives based on quark position changes, emphasizing the lack of practical means to control quark positions for experimental observation.

Areas of Agreement / Disagreement

Participants express interest in the theoretical aspects of quark behavior and its implications for nuclear stability, but there is no consensus on the feasibility of measuring these effects or the current state of theoretical development.

Contextual Notes

Limitations include the theoretical nature of the discussion, the absence of practical methods to manipulate quark positions, and unresolved questions regarding the relationship between quark distance changes and nuclear half-lives.

dkbenn
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I am curious to know if there have been any experiments to measure change in nuclear disintegration rates/ gamma emissions with change of distance between quarks in nucleons?

Thank you.

Douglas
 
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Yes, it's called deeply virtual Compton scattering and gives access to general parton distributions. If you are interested I can provide references.
 
Yes I would be very interested in the references. Do the papers describe the mechanism of the Compton scattering and how it changes the position of the quarks within the nucleons? I am particularly interested in the distance changes between the quarks and the amount of change in the nuclide half life. Is this a quantum effect so that certain minimum distance changes have to occur before a nuclear rearrangement occurs? I am a non-mathematician (Professor of Radiology) so after reading the papers perhaps I could follow up with more questions.

Thank you.
 
It is a rather technical topic. For instance :
Leading twist nuclear shadowing, nuclear generalized parton distributions and nuclear DVCS at small x
So, this is exactly a description of gamma emission parameterized in terms of quark-quark correlations.

To my knowledge, the theory is not developed to the point where you are going to have an answer for half-lives however. In practice of course, we have no means to control the quarks positions so we could record changes in life-time. So at best, you would only have theoretical estimates.
 

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