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Antimatter worth the weight (Leonard Eun and Steve Heppelmann)

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The alpha-particle, the helium nucleus consisting of two protons and two neutrons, was identified a century ago by Ernest Rutherford. Its antimatter counterpart of two antiprotons and two antineutrons has now been detected by the Relativistic Heavy Ion Collider at Brookhaven National Laboratory in Upton, New York.

The STAR Collaboration has detected anti-alpha-particles the heaviest antinuclei observed to date at a yield that is consistent with expectations from thermodynamic and coalescent nucleosynthesis models. This discovery provides an indication of the likely production rates of even heavier antimatter nuclei, and serves as a benchmark for possible future observations of anti-alpha-particles in the cosmos.