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The scintillation light output response of stilbene crystals has beenmeasured for protons recoiling along the \textit{a}, \textit{b}, and\textit{c'} crystalline axes with energies between 1.3 and 10 MeV usingneutrons produced with the tandem Van de Graaff accelerator at TriangleUniversities Nuclear Laboratory. The proton recoil energy and direction weremeasured using the coincident detection of neutrons between a stilbenescintillator and an array of EJ-309 liquid scintillators spanning arrangedneutron recoil angles. The maximum light output was found to coincide withproton recoils along the \textit{a}-axis, in disagreement with other publishedmeasurements, which reported the \textit{b}-axis as the direction of themaximum light output. Additional measurements were conducted using twodifferent stilbene crystals to confirm these results: a second measurementusing the coincident detection of neutrons; measurements of neutron full energydeposition events along the \textit{a} and \textit{b} axes; and measurements ofthe count rate for $^{252}$Cf neutrons traveling along the \textit{a} and\textit{b} axes directions. All measurements found that recoils along the\textit{a}-axis produce the maximum light output.

High-precision characterization of the neutron light output of stilbene along the directions of maximum and minimum response