DescriptionHydrogen-7, an extremely neutron-rich and unbound isotope of hydrogen, and similar exotic light nuclei near the neutron drip line have measured half-lives on the order of 10^-23 to 10^-22 seconds, at the boundary of what can even be considered a bound nuclear state rather than a resonance — among the shortest nuclear lifetimes ever characterized, requiring specialized radioactive-beam facilities to produce and detect via their decay-particle correlations.
Formal questionThe shortest half-life confirmed via direct experimental measurement for an atomic nucleus (a bound nuclear ground or isomeric state, as opposed to a scattering resonance).
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