Spin Observables for Electromagnetic Nuclear Physics with Few-Body ystems

Abstract

We discuss aspects of the physics program with polarized electrons and polarized few-body systems in Amsterdam. Polarized electrons were injected into the AmPS storage ring at a beam energy of 720 MeV, while a Siberian snake was employed to preserve longitudinal polarization at the interaction point. Vector-polarized deuterium was produced by an atomic beam source and injected into an open-ended cylindrical cell, internal to the electron storage ring. The spin correlation parameter A ^v _ed was measured for the (e, e′p) and (e,e′n) reactions at a four-momentum transfer squared of 0.21 (GeV/c)². The data are sensitive to the spin structure of the deuteron and allow to extract a value for the charge form factor of the neutron.