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We study the nucleosynthesis products in neutrino-driven winds from rapidlyrotating, highly magnetised and misaligned protomagnetars using the nuclearreaction network SkyNet. We adopt a semi-analytic parametrized model for theprotomagnetar and systematically study the capabilities of its neutrino-drivenwind for synthesizing nuclei and eventually producing ultra-high energy cosmicrays (UHECRs). We find that for neutron-rich outflows ($Y_e<0.5$), synthesis ofheavy elements ($\overline{A}\sim 20-65$) is possible during the first $\sim10$ seconds of the outflow, but these nuclei are subjected tocomposition-altering photodisintegration during the epoch of particleacceleration at the dissipation radii. However, after the first $\sim 10$seconds of the outflow, nucleosynthesis reaches lighter elements($\overline{A}\sim 10-50$) that are not subjected to subsequentphotodisintegration. For proton-rich ($Y_e \geq 0.5$) outflows, synthesis ismore limited ($\overline{A}\sim 4-15$). These suggest that while protomagnetarstypically do not synthesize nuclei heavier than second r-process peak elements,they are intriguing sources of intermediate/heavy mass UHECRs. For allconfigurations, the most rapidly rotating protomagnetars are more conducive fornucleosynthesis with a weaker dependence on the magnetic field strength.

Systematic exploration of heavy element nucleosynthesis in protomagnetar outflows