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Short range correlations and the EMC effect.

L B Weinstein1, E Piasetzky, D W Higinbotham

  • 1Old Dominion University, Norfolk, Virginia 23529, USA. weinstein@odu.edu

Physical Review Letters
|March 17, 2011
PubMed
Summary
This summary is machine-generated.

The European Muon Collaboration (EMC) effect in electron scattering is quantitatively linked to short-range correlations (SRC) in nuclei. This correlation helps determine neutron-to-proton structure function ratios and deuteron properties.

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Area of Science:

  • Nuclear Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • The European Muon Collaboration (EMC) effect describes modifications to nucleon structure functions within atomic nuclei.
  • Short-range correlations (SRC) represent high-momentum nucleons within nuclei, crucial for understanding nuclear structure.

Purpose of the Study:

  • To quantitatively establish a relationship between the EMC effect and SRC scale factors.
  • To extract nuclear structure information, specifically the deuteron to free proton-neutron pair cross-section ratio and the neutron to proton structure function ratio F(2)(n)/F(2)(p).

Main Methods:

  • Analysis of electron deep inelastic scattering data at intermediate x(B) (0.35≤x(B)≤0.7) to quantify the EMC effect.
  • Analysis of electron inclusive scattering data at x(B)≥1 to obtain SRC scale factors.
  • Establishing a linear correlation between these two observables.

Main Results:

  • A direct linear relationship was quantitatively demonstrated between the magnitude of the EMC effect and the SRC scale factor.
  • The derived ratio of deuteron to free proton-neutron pair cross sections was obtained.
  • The ratio of free neutron to free proton structure functions, F(2)(n)/F(2)(p), was extracted.

Conclusions:

  • The observed correlation suggests that both the EMC effect and SRC are significantly influenced by high-virtuality (high-momentum) nucleons.
  • This finding provides a new perspective on the interplay between nuclear structure and nucleon modifications.