Abstract
We have measured photoreactions on 3 He and 4 He in Hall B at Jefferson Lab, using real photons from the Photon Tagger and the CEBAF Large-Acceptance Spectrometer (CLAS). We obtained data over the full range of the Tagger — 0.33 to 1.56 GeV with an incident electron-beam energy of 1.645 GeV. Tagged, circularly polarized photons, produced by the 70% longitudinally polarized electrons, were incident on 1.2-g/cm2 liquid-helium targets positioned at the center of the CLAS. We were able to collect data at rates exceeding 3 kHz, and succeeded in collecting approximately 1.2 billion events for 3 He and 0.8 billion for 4 He . Over 5 Tb of data were obtained. The data show very good stability throughout the experimental run. Preliminary results from the analysis of several reaction channels are given here.
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