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We carry out extensive direct path integral Monte Carlo (PIMC) simulations ofthe uniform electron gas (UEG) at finite temperature for different values ofthe spin-polarization $\xi$. This allows us to unambiguously quantify theimpact of spin-effects on the momentum distribution function $n(\mathbf{k})$and related properties. We find that interesting physical effects like theinteraction-induced increase in the occupation of the zero-momentum state$n(\mathbf{0})$ substantially depend on $\xi$. Our results further advance thecurrent understanding of the UEG as a fundamental model system, and are ofpractical relevance for the description of transport properties of warm densematter in an external magnetic field.  All PIMC results are freely available online and can be used as a benchmarkfor the development of new methods and applications.

Momentum distribution of the Uniform Electron Gas at finite temperature: Effects of spin-polarization