Precise measurement of the neutron magnetic form factor from quasielastic 3vector He(vector e,e')

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 Q2 was previously determined at MIT-Bates from the quasielastic 3vector He(vector e,e') process. A new experiment is planned at TJNAF to systematically measure the inclusive 3He quasielastic transverse asymmetry, AT', at Q2=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 Q2, and 3% systematic uncertainty for AT' can be achieved for this experiment. The precise data will constrain theoretical calculations of 3He quasielastic asymmetry. Furthermore, the neutron magnetic form factor at Q2=0.1-0.5 (Gev/c)2 will be extracted from the measured asymmetries with an overall uncertainty of 2%. Precise measurements of GnM at low Q2 will resolve the discrepancy among the existing data in the same Q2 region. (orig.)