hydrogen-4

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 weight is 4.0279121. It decays through neutron emission and has a half-life of 9.93696x10^-23seconds.

Hydrogen-3	Isotopes of Hydrogen	Hydrogen-5
Produced from: none	Decay chain	Decays to: Hydrogen-3

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