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For most elements, the isotopic ratios seen in cosmic rays (CRs) are similarto those in the solar wind. The most important exception to this is$^{22}$Ne/$^{20}$Ne where the CR value is $\sim 5$ times that of the solarwind. According to most recent models of nucleosynthesis, a large amount of$^{22}\mathrm{Ne}$ is generated in Wolf-Rayet (WR) stars. In the winds ofcarbon sequence WR stars, i.e., WC stars, the isotopic ratio$^{22}\mathrm{Ne}$/$^{20}\mathrm{Ne}$ can be much larger than in the solarwind. Here, we consider CRs produced by $^{22}\mathrm{Ne}$-enriched WR winds incompact clusters of young massive stars like Westerlund~1. We assume thatefficient CR acceleration in clusters occurs over the WR lifetime in anensemble of shock waves from multiple massive star winds. We estimate thefraction of all Galactic CRs such sources may produce for a given set ofparameters.

Wolf-Rayet stars in young massive star clusters as potential sources of Galactic cosmic rays