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Additional
helium-3
English Wikipedia - The Free Encyclopedia
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Helium-3
Helium-3
(
He-3
, also written as
3
He
) is a light, non-
radioactive
isotope
of
helium
with two
protons
and one
neutron
, in contrast with two neutrons in common helium. Its hypothetical existence was first proposed in 1934 by the Australian
nuclear physicist
Mark Oliphant
while he was working at the
University of Cambridge
Cavendish Laboratory
. Oliphant had performed experiments in which fast
deuterons
collided with deuteron targets (incidentally, the first demonstration of
nuclear fusion
). Helium-3 was thought to be a
radioactive isotope
until
helions
were also found in samples of natural helium, which is mostly
helium-4
, taken both from the terrestrial atmosphere and from
natural gas
wells.
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