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Proton source size measurements in the eA-->e'ppX reaction.

A V Stavinsky1, K R Mikhailov, R Lednicky

  • 1Institute of Theoretical and Experimental Physics, Moscow, 117218, Russia.

Physical Review Letters
|December 17, 2004
PubMed
Summary

Researchers studied two-proton correlations in electron-nucleus scattering experiments. They observed correlations consistent with theory and measured the size of the proton emission region, finding it depends on the nucleus and proton momentum.

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Area of Science:

  • Nuclear Physics
  • Particle Physics

Background:

  • Two-proton correlations provide insights into nuclear structure and reaction mechanisms.
  • Understanding short-range nucleon-nucleon interactions is crucial in nuclear physics.

Purpose of the Study:

  • Investigate two-proton correlations at small relative momentum (q) in electron-nucleus scattering.
  • Determine the size of the two-proton emission region and its dependence on nuclear mass (A) and proton momentum.
  • Measure the two-proton emission region size for Helium (He) in electron-nucleus reactions for the first time.

Main Methods:

  • Utilized the CLAS detector at Jefferson Lab for electron-nucleus scattering experiments.
  • Studied the eA --> e'ppX reaction with an incident electron beam energy E(0)=4.46 GeV.
  • Analyzed two-proton correlations as a function of relative momentum q.

Main Results:

  • Observed an enhancement in the two-proton correlation function at small q, consistent with theoretical predictions.
  • Extracted the sizes of the two-proton emission region.
  • Found the emission region size to be dependent on the target nucleus (A) and the proton momentum.

Conclusions:

  • The experimental results for two-proton correlations align with theoretical expectations.
  • The size of the proton emission region is influenced by nuclear properties and proton kinematics.
  • This study provides the first measurement of the two-proton emission region size in electron-nucleus reactions for Helium.