The double spin asymmetry of nitrogen in elastic and quasielastic kinematics from a solid ammonia dynamically polarized target

摘要

Solid ammonia (NH3) is commonly used as a dynamically polarized proton target for electron and muon scattering cross-section asymmetry measurements. As spin 1(+) particles, the N-14 nuclei in the target are also polarized and contribute a non-trivial asymmetry background that should be addressed. We describe here a method to extract the nitrogen contribution to the asymmetry, and report the cross-section asymmetries of electron-nitrogen scattering at beam energies of E = 1.7 GeV and E = 2.2 GeV, and momentum transfer of Q(2) = 0.023 - 0.080 GeV2.