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Background: Uncertainty quantification for nuclear theories has gained a moreprominent role in the field, with more and more groups attempting to understandthe uncertainties on their calculations. However, recent studies have shownthat the uncertainties on the optical potentials are too large for the theoryto be useful. Purpose: The purpose of this work is to explore possibleexperimental conditions that may reduced the uncertainties on elasticscattering and single-nucleon transfer cross sections that come from thefitting of the optical model parameters to experimental data. Method: UsingBayesian methods, we explore the effect of the uncertainties of optical modelparameters on the angular grid of the differential cross section, includingcross section data at nearby energies, and changes in the experimental errorbars. We also study the effect on the resulting uncertainty when otherobservables are included in the fitting procedure, particularly the total(reaction) cross sections. Results: We study proton and neutron elasticscattering on 48Ca and 208Pb. We explore the parameter space with Markov- ChainMonte Carlo, produce posterior distributions for the optical model parameters,and construct the corresponding 95% confidence intervals on theelastic-scattering cross sections. We also propagate the uncertainties on theoptical potentials to the 48Ca(d,p)49Ca(g.s.) and 208Pb(d,p)209Pb(g.s.) crosssections. Conclusions: We find little sensitivity to the angular grid and animprovement of up to a factor of 2 on the uncertainties by including data at anearby energy. Although reducing the error bars on the data does reduce theuncertainty, the gain is often considerably smaller than one would naivelyexpect.

Exploring experimental conditions to reduce uncertainties in the optical potential