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Efficient detection of spectator fragments is key to the main topics at anelectron-ion collider (eIC). Any process which leads to emission of fragmentsor $\gamma$'s breaks coherence in diffractive processes. Therefore this isequivalent to non-detection of rapidity gaps in pp collisions. For example, incoherent photoproduction of vector mesons their 4-momentum transferdistribution would image the "gluon charge" in the nucleus in the same way thatHofstadter measured its charge structure using elastic scattering of $\sim$100MeV electrons. Whereas he could measure the $\sim$4 MeV energy loss by theelectron due to excitation of nuclear energy levels (Figure 1), even the energyspread of the incident beam would prevent such an inclusive selection ofquasielastic events at an eIC. The only available tool is fragment detection.Since, in our example, one finds that $\sim100$ of deexcitations go through$\gamma$'s or 1 neutron, rarely to 2 neutron and never to protons(due toCoulomb barrier suppression), the eIC design should emphasize their detection.

The role of Spectator Fragments at an electron Ion collider