# The Double Spin Asymmetry of Nitrogen in Elastic and Quasielastic Kinematics from a Solid Ammonia Dynamically Polarized Target

## TL;DR

This paper measures the spin asymmetry of nitrogen nuclei in a polarized ammonia target during electron scattering, providing insights into nitrogen's contribution to the overall asymmetry background in such experiments.

## Contribution

It introduces a method to extract nitrogen's asymmetry contribution and reports new measurements of electron-nitrogen scattering asymmetries at specific energies and momentum transfers.

## Key findings

- Nitrogen contributes a measurable asymmetry background.
- Method successfully isolates nitrogen's asymmetry contribution.
- Results inform background correction in polarized target experiments.

## Abstract

Solid ammonia (NH$_3$) is commonly used as a dynamically polarized proton target for electron and muon scattering cross-section asymmetry measurements. As spin 1$^{+}$ particles, the $^{14}$N 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 $Q^{2}=0.023-0.080$ GeV$^{2}$.