Abstract
The first measurement of the helicity dependence of the total inclusive photo-absorption cross section and of partial photon-induced reaction channels on 3He was carried out at MAMI (Mainz) in a photon energy range between 200 and 450 MeV. The experiment used the large acceptance Crystal Ball spectrometer, complemented by a charged particle and a vertex detector, a circularly polarized tagged photon beam and a longitudinally polarized high-pressure 3He gas target. The results obtained give information on the GDH sum rule on the neutron and allow an investigation of the modifications of nucleon properties inside 3He.
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