Light Helium
NOV 01, 1948
DOI: 10.1063/1.3066198
The natural occurrence of a helium isotope of atomic weight 3 was observed in the Berkeley cyclotron in 1939 by Alvarez and Cornog, who showed that its abundance was very low compared with that of the normal helium atom of atomic weight 4.
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© 1948 American Institute of Physics
