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Related to antihelium: sulphur hexafluoride, sulfur hexafluoride


 (ăn′tē-hē′lē-əm, ăn′tī-)
The antimatter equivalent of helium.
References in periodicals archive ?
Ting hopes to find complex antimatter--perhaps antihelium (two antiprotons and two antineutrons) or antideuterons--that was forged just after the Big Bang.
One is how often one might expect to find antihelium - or any other kind of antimatter - in the universe.
A star made of anti-matter, which would be converting antihydrogen into antihelium, would emit antineutrinos and could therefore be told from a star burning normal matter.
Physicists agree that finding even one stray antihelium would be compelling evidence of antimatter galaxies.
Given the expense and sensitivity of the three current research programs, failure to find an antihelium would make it hard to justify another generation of bigger, better, and costlier instruments, says Robert Streitmatter, a colleague of Mitchell at NASA's Goddard Space Flight Center in Greenbelt, Md.
However, detecting even a single nucleus of antihelium near Earth would be strong evidence that antimatter stars and galaxies are out there somewhere.