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antihelium. In DICTIOUS you will not only get to know all the dictionary meanings for the word
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English
Etymology
anti- + helium
Noun
antihelium (countable and uncountable, plural antiheliums)
- (physics) The antiatom form of helium
1987, K. N. Mukhin, Experimental Nuclear Physics: Elementary particle physics, page 134:In 1970, a more complex antinucleus, antihelium-3 (iHe), was discovered in the USSR.
1994, Sven Kullander, Kullander Sven, Börje Larsson, Out of Sight!: From Quarks to Living Cells, →ISBN, page 218:In principle the energy should have been enough for the production of even heavier antinuclei. However, the probability for production of heavier masses is very tiny, and antihelium-3 is still the heaviest known antielement.
2018, Borissov Guennadi, Story Of Antimatter, The: Matter's Vanished Twin, →ISBN, page 91:After several launches of their balloon, the scientists registered more than 40 million nuclei of helium in the cosmic rays, but not a single nucleon of antihelium.
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