Speaker
Description
A polarized target program is being developed for GlueX in Hall D at Jefferson Lab. Consisting of a high intensity tagged photon beam with energies up to 12 GeV, a hermetic solenoidal spectrometer sensitive to charged and neutral particles and a demonstrated DAQ rate of 80 kHz, the apparatus is ideal for many polarized target experiments with longitudinal target polarization. Already approved is the Real Gamma GDH Experiment (REGGE), to measure the Gerasimov-Drell-Hearn (GDH) integrand on hydrogen and deuterium. This experiment will test the convergence of the GDH integral at high energy and the validity of the GDH sum rule to increased precision for the proton and for the neutron for the first time with a real photon beam. An expansion is being pursued which will measure the GDH sum rule on nucleons in nuclei. It is also possible to measure polarization observables from correlated nucleons within nuclei to study the relationship to the EMC effect.
