Observation of the antimatter helium-4 nucleus

@article{Collaboration2011ObservationOT,
  title={Observation of the antimatter helium-4 nucleus},
  author={Star Collaboration},
  journal={Nature},
  year={2011},
  volume={473},
  pages={353-356}
}
High-energy nuclear collisions create an energy density similar to that of the Universe microseconds after the Big Bang; in both cases, matter and antimatter are formed with comparable abundance. However, the relatively short-lived expansion in nuclear collisions allows antimatter to decouple quickly from matter, and avoid annihilation. Thus, a high-energy accelerator of heavy nuclei provides an efficient means of producing and studying antimatter. The antimatter helium-4 nucleus (), also known… 
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