Prospects for Antinuclei Detection in Light of Antiproton Limits
AMS-02 has tentatively observed a handful of heavy antinuclei events most consistent with a flux of antihelium nuclei that exceeds the expected flux from cosmic-ray propagation models. We pproduce updated models of cosmic-ray propagation that correctly take into account recently updated nuclear cross-section measurements and observational constraints from recently released AMS-02 data. We find that standard astrophysical production models should produce no more than ~0.1 antihelium events, and approximately 1 antideutron event. Dark Matter annihilation can produce a larger antinuclei flux, with an expectation of approximately 1 event for standard annihilation models, but potentially many more events if optimistic models of Lambda-b driven antihelium production are accurate. If any antihelium-4 is discovered, novel physics is required.
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