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Name, symbol Hydrogen-4,4H
Neutrons 3
Protons 1
Nuclide data
Half-life 9.93696x10-23 seconds
Isotope mass 4.0279121 u
Spin 2

Hydrogen-4 is a highly unstable isotope of hydrogen. The nucleus consists of a proton and three neutrons. It has been synthesised in the laboratory by bombarding tritium with fast-moving deuterium nuclei (see this article). In this experiment, the tritium nuclei captured neutrons from the fast-moving deuterium nucleus. The presence of the hydrogen-4 was deduced by detecting the emitted protons. Its atomic mass is 4.0279121. It decays through neutron emission and has a half-life of 9.93696x10-23 seconds.


In the 1955 satirical novel The Mouse That Roared, the name quadium was given to the hydrogen-4 isotope that powered the Q-bomb that the Duchy of Grand Fenwick captured from the United States.

See also

Hydrogen-3 Isotopes of Hydrogen Hydrogen-5
Produced from:
Decay chain Decays to:
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Hydrogen-4". A list of authors is available in Wikipedia.
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