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We develop for the first time a microscopic global nucleon-nucleus opticalpotential with quantified uncertainties suitable for analyzing nuclear reactionexperiments at next-generation rare-isotope beam facilities. Within theimproved local density approximation and without any adjustable parameters, webegin by computing proton-nucleus and neutron-nucleus optical potentials from aset of five nuclear forces from chiral effective field theory for 1800 targetnuclei in the mass range 12 $\leq$ A $\leq$ 242 for energies between 0 MeV $<$E $\lesssim$ 150 MeV. We then parameterize a global optical potential for eachchiral force that depends smoothly on the projectile energy as well as thetarget nucleus mass number and isospin asymmetry. Uncertainty bands for elasticscattering observables are generated from a full covariance analysis of theparameters entering in the description of our global optical potential andbenchmarked against existing experimental data for stable target nuclei. Sinceour approach is purely microscopic, we anticipate a similar quality of themodel for nucleon scattering on unstable isotopes.

A global microscopic description of nucleon-nucleus scattering with quantified uncertainties