Undergrad Quasi-Elastic Scattering Peak-Shift

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SUMMARY

In quasi-elastic scattering experiments, a diagram of scattered electron energy versus counts reveals two distinct peaks: one for elastically scattered electrons and another peak shifted by 8 MeV to lower energies due to the binding energy of protons within the nucleus. This shift originates from the elastic scattering off free electrons, not from the nucleus itself, as the binding energy of protons is lower than that of the entire nucleus. The discussion clarifies that the energy loss observed is not due to the disintegration of bound protons but rather the energy dynamics involved in the scattering process.

PREREQUISITES
  • Understanding of quasi-elastic scattering in particle physics
  • Familiarity with electron-nucleus scattering experiments
  • Knowledge of binding energy concepts and equations
  • Basic principles of energy conservation in particle interactions
NEXT STEPS
  • Study the principles of quasi-elastic scattering in detail
  • Explore the binding energy equation and its implications in nuclear physics
  • Investigate the role of free electrons in scattering experiments
  • Learn about energy loss mechanisms in particle collisions
USEFUL FOR

Particle physicists, nuclear physicists, and students studying advanced concepts in scattering theory and energy dynamics in particle interactions.

deuteron
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TL;DR
Clarifying the 8 MeV shift due to the binding energy of the proton in the nucleus
We were told in my particle physics lectures that in a quasi-elastic scattering, in a diagram of scattered electron energy ##E'##-counts corresponding to an electron-nucleus scattering experiment at a fixed detector angle ##\theta##, we would have a peak corresponding to the electrons that have scattered elastically off of the nucleus, and then another peak that is 8 MeV shifted to lower energies due to the binding energy of the proton in the nucleus. Just to be sure, the 8 MeV shift is happening from an elastic-scattering-off-of-free-electrons-peak that is not visible in the diagram, and not from the elastic-scattering-off-of-the-nucleus-peak, since the bound proton has a much lower energy than the whole nucleus, right?
 
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According to binding energy equation, Binding Energy, the bound proton would have a lower energy than the total nucleus. Are you asking if your electrons are breaking apart bound protons or losing energy to bound protons?
 

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