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For the last few decades, one-nucleon knockout reactions on light compositetargets -- $^9$Be or $^{12}$C -- have been extensively used to study thesingle-particle (s.p.) structure of nuclei far from stability. To determinewhich information can be accurately inferred from knockout cross sections, weconduct a sensitivity analysis of these observables considering various s.p.descriptions within the usual eikonal description of the reaction. This workshows that total one-neutron knockout cross sections are not sensitive to theshort-range part of the s.p. wave function. Rather, they scale with the meansquare radius of the overlap function. Using a perturbative expression of thecross section, we can easily explain our numerical predictions analytically.This analysis suggests that (i) spectroscopic factors extracted from knockoutdata suffer from sizeable model uncertainties associated with the choice ofs.p. wave functions and (ii) knockout reactions constitute an excellent probeof the radius of the nucleus and therefore offer an alternative technique toinfer the neutron-skin thickness of exotic nuclei.

Sensitivity of one-neutron knockout observables of loosely- to more deeply-bound nuclei