Resolution criteria

This market resolves to YES if, by December 31, 2090 at 11:59 PM UTC, experimental evidence confirming the synthesis or direct observation of the hydrogen-8 isotope ($^8\text{H}$, consisting of one proton and seven neutrons) is published in a peer-reviewed scientific journal or officially recognized by an established nuclear physics evaluation body (such as the NUBASE evaluation of nuclear properties or the Brookhaven National Laboratory National Nuclear Data Center).

Experimental production requires the observation of a resonant nuclear state or bound/unbound system identified as $^8\text{H}$. Purely theoretical calculations, simulations, or unverified claims that are retracted or widely refuted before the deadline will not qualify.

If no peer-reviewed discovery or accepted evaluation has taken place by December 31, 2090, 23:59 UTC, the market resolves to NO.

Background

Hydrogen-7 ($^7\text{H}$), consisting of one proton and six neutrons, is currently the heaviest observed isotope of hydrogen. It was first synthesized in 2003 at the RIKEN accelerator facility in Japan by bombarding a hydrogen target with helium-8 beams. It is extremely unstable, existing only as a resonance with an estimated half-life on the order of $10^{-23}$ seconds.

Producing hydrogen-8 ($^8\text{H}$) would require adding a seventh neutron to a single proton, placing it far beyond the established neutron drip line. In nuclear structure theory, odd-neutron configurations at extreme neutron-to-proton ratios face strong instability against spontaneous neutron emission, making its creation and distinct experimental detection a major challenge in experimental nuclear physics.

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