  Using neutron scattering, we investigate the static and dynamic structure
functions $S(Q,\omega)$ of 3 distinct solid phases (using powder average
techniques), and characterize the corresponding modes of energy excitation,
focusing primarily on the dynamics of spin interaction. With the $S(Q,\omega)$
maps, we extract the temperature dependent production rate and upscattering
cross section, that are relevant for understanding experimental data on
ultracold neutron production in solid oxygen at the saturated vapor pressure.
