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The three-dimensional picture of quarks and gluons in the proton is set to berevealed through Deeply virtual Compton scattering while a critically importantpuzzle in the one-dimensional picture remains, namely, the origins of the EMCeffect. Incoherent nuclear DVCS, i.e. DVCS on a nucleon inside a nucleus, canreveal the 3D partonic structure of the bound nucleon and shed a new light onthe EMC effect. However, the Fermi motion of the struck nucleon, off-shelleffects and final-state interactions (FSIs) complicate this parton levelinterpretation. We propose here a measurement of incoherent DVCS with a taggingof the recoiling spectator system (nucleus A-1) to systematically controlnuclear effects. Through spectator-tagged DVCS, a fully detected final statepresents a unique opportunity to systematically study these nuclear effects andcleanly observe possible modification of the nucleon's quark distributions.  We propose to measure the DVCS beam-spin asymmetries (BSAs) on $^4$He anddeuterium targets. The reaction $^4$He$(e,e^{\prime}\gamma\,p\,^3$H$)$ with afully detected final state has the rare ability to simultaneously quantifyFSIs, measure initial nucleon momentum, and provide a sensitive probe to othernuclear effects at the parton level. The DVCS BSA on a (quasi-free) neutronwill be measured by tagging a spectator proton with a deuteron target.Similarly, a bound neutron measurement detects a spectator $^3$He off a $^4$Hetarget. These two observables will allow for a self-contained measurement ofthe neutron off-forward EMC Effect.

Spectator-Tagged Deeply Virtual Compton Scattering on Light Nuclei