  The three-dimensional picture of quarks and gluons in the nucleon is set to
be revealed through deeply virtual Compton scattering (DVCS). With the absence
of a free neutron target, the deuterium target represents the simplest nucleus
to be used to probe the internal 3D partonic structure of the neutron. We
propose here to measure the beam spin asymmetry (BSA) in incoherent neutron
DVCS together with the approved E12-06-113 experiment (BONuS12) within the run
group F, using the same beam time, simply with addition of beam polarization.
The DVCS BSA on the quasi-free neutron will be measured in a wide range of
kinematics by tagging the scattered electron and the real photon final state
with the spectator proton. We will also measure BSA with all final state
particles detected including the struck neutron. The proposed measurements is
complementary to the approved CLAS12 experiment E12-11-003, which will also
measure the quasi-free neutron DVCS by detecting the scattered neutron, but not
the spectator proton. Indeed, besides providing more data for neutron DVCS,
this experiment will allow a comparison of the measurement of the BSA of
neutron DVCS from the approved E12-11-003 with the measurements using the two
methods proposed herein. This comparison will help to understand the impact of
nuclear effects, such as the final state interactions (FSI) and Fermi motion on
the measurement of the neutron DVCS.
