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We present experimental data on ultracold neutron (UCN) production in solidoxygen from 5 K to 50 K. The experiment used 3 cells of different dimensions inorder to study the excess UCN elastic scattering in s-O$_2$ due to sourcedensity non-uniformities. We present a combined $\chi^2$ analysis with the aidof Monte-Carlo simulations which contain the detailed physics of UCN transportas well as cold neutron attenuation. The results validate the UCN productionand upscattering cross-sections extracted from the dynamic structure functionderived from inelastic neutron scattering, and illustrate the role of magneticscattering in enhancing UCN production in s-O$_2$.

Understanding Ultracold Neutron Production in Oxygen Solids from Volume and Temperature Dependent Yields