10-12 April 2019
Denver, CO
US/Mountain timezone
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Contribution invited talk

Denver, CO - Director's Row H

Investigating the EMC effect in highly-virtual nucleons at Jefferson Lab


  • Florian HAUENSTEIN

Primary authors


Deep Inelastic Scattering (DIS) experiments on deuterium where the recoiling nucleon is detected as well ("tagged"), allows to measure how the quark-structure of the bound nucleon (as measured by its “structure function”) varies with its initial momentum (as measured by the spectator nucleon momentum). Therefore, we can determine how and why the structure of bound protons differs from free ones. This will resolve the 35-year-old enigma of the EMC effect.

Two measurements for tagged DIS measurements on deuterium are planned at Jefferson Lab. They will use two new detectors, BAND (Backward Angle Neutron Detector) and LAD (Large Angle Spectrometer), to detect the recoiling neutrons and protons, respectively. BAND is installed just upstream of the existing CLAS12 spectrometer in Hall B to detect high momentum neutrons at scattering angles between 160 and 170 degrees. LAD will be installed at Hall C to detect high momentum protons at 90 to 170 degrees. In my talk, I will present the planned measurements and preliminary results from the fall 2018 calibration and winter 2019 production runs for the BAND detector.