A preliminary study for measuring the electro-production of photons off nucleons in the deeply
inelastic regime is ongoing at Jefferson Lab using a nearly 12-GeV electron beam on longitudinally
polarized proton and neutron targets. Beam-spin, target-spin, and double-spin asymmetries for
𝑒𝑁 → 𝑒′ 𝑁′𝛾 events will be extracted over wide kinematics in 𝑄2, 𝑥𝐵 𝑗 , 𝑡 and Φ. In the framework
of Generalized Parton Distributions (GPDs), they provide insight into the electric and axial charge
distributions of valence quarks in protons and neutrons. Preliminary data is available for protons in
hydrogen from an 𝑁 𝐻3 target, and preliminary raw asymmetries are reported. Their comparison
to previous measurements is used as a sanity check. It validates the available analysis tools that
will be applied for the case of protons and neutrons in deuterium, for which data will be available
in the near future. The neutron measurement is of particular interest since it will allow us to
extract the flavor-dependence of the observables for the first time by comparison with the proton
data.