Measurement of the Nuclear Transparency by Double Scattering in D(e,e'p)

Details Measurement of the Nuclear Transparency by Double Scattering in D(e,e'p) Measurement of the Nuclear Transparency by Double Scattering in D(e,e'p)

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..apr.d7006b&link_type=abstract

American Physical Society, April Meeting, 2004, May 1-4, 2004, Denver, Colorado April 2004, MEETING ID: APR04, abstract #D7.006

Physics

Scientific paper

We have measured the Q ^2 -dependence (from 1 to 6 GeV ^2 ) of final-state interactions (FSIs) in quasi-elastic electron scattering on deuterium using the CEBAF Large Acceptance Spectrometer (CLAS). The significant reduction of FSIs with Q ^2 compared to predictions based on the eikonal approach provides evidence for color transparency (CT). The large acceptance of CLAS allows us to detect high-momentum protons in the direction of the virtual photon (from which neutron recoil momenta can be deduced) or low-momentum (250-800 MeV/c) recoil protons at large angles. FSIs enhance the recoil momentum perpendicular to the virtual photon as compared to the usual Fermi motion. The experimental ratio of the number of events with recoil momentum near 450 MeV/c compared to near 200 MeV/c decreases with Q^2 as predicted in models of CT. Preliminary results will be shown.

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