Saxonberg Server API
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    DecayMode:
        | "alpha"
        | "beta-minus"
        | "beta-plus"
        | "gamma"
        | "spontaneous-fission"
        | "electron-capture"

    Radioactive decay modes. Lower-division pedagogy ships the four common types; rarer modes (electron capture, internal conversion, cluster decay) are content-extensions when the curriculum needs them.