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Neutron skin thickness ($\Delta r_{\rm np}$) of nuclei and the inferrednuclear symmetry energy are of critical importance to nuclear physics andastrophysics. It is traditionally measured by nuclear processes withsignificant theoretical uncertainties. We recently proposed an indirectmeasurement of the $\Delta r_{\rm np}$ by charged hadron multiplicities incentral isobaric collisions at relativistic energies, which are sensitive tonuclear densities. In this Letter, we propose a direct measurement of the$\Delta r_{\rm np}$ by using net-charge multiplicities in ultra-peripheral(grazing) collisions of those isobars, under the assumption that they aresimple superimposition of nucleon-nucleon interactions. We illustrate thisnovel approach by the TRENTO and URQMD models.

Measuring neutron skin by grazing isobaric collisions