Abstract
Polarized 3He targets have proven to be a useful tool for studying the electric and magnetic form factors of the neutron, and the spin structure of the neutron. The neutron magnetic form factor at low Q 2 was previously determined at MIT-Bates from the quasielastic 3 H e( e , e′) process. A new experiment is planned at TJNAF to systematically measure the inclusive 3He quasielastic transverse asymmetry, A T′, at Q 2 = 0.1−0.5 (GeV/c) 2 with high statistical and systematic accuracy. A 2% statistical uncertainty is aimed at all the proposed values of Q 2, and 3% systematic uncertainty for A T′ can be achieved for this experiment. The precise data will constrain theoretical calculations of 3He quasielastic asymmetry. Furthermore, the neutron magnetic form factor at Q 2 = 0.1−0.5 (Gev/c) 2 will be extracted from the measured asymmetries with an overall uncertainty of 2%. Precise measurements of G M n at low Q 2 will resolve the discrepancy among the existing data in the same Q 2 region.
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