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 14N 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 Q2=0.023−0.080 GeV2.
@article{arxiv.1905.12550,
title = {The Double Spin Asymmetry of Nitrogen in Elastic and Quasielastic Kinematics from a Solid Ammonia Dynamically Polarized Target},
author = {Moshe Friedman and Jessica Campbell and Donal Day and Douglas W. Higinbotham and Adam Sarty and Guy Ron},
journal= {arXiv preprint arXiv:1905.12550},
year = {2019}
}