Abstract
The formation of the 5H superheavy hydrogen isotope was experimentally sought in the reactions induced by stopped π− mesons absorbed by 9Be nuclei. Peaks in missing-mass spectra were observed in two reaction channels, 9Be(π−, pt)X and 9Be(π−, dd)X, and were attributed to the 5H resonance states. The lowest state has parameters Er=5.5±0.2 MeV and Г=5.4±0.5 MeV [E r is the resonance energy measured from the (triton + two neutrons) threshold]. Therefore, 5H is bound more weakly than 4H. Excited states of 5H were also observed. All three resonance levels (E 1r=10.6±0.3 MeV, Г1r=6.8±0.5 MeV; E 2r=18.5±0.4 MeV, Г2r=4.8±1.3 MeV; E 3r=26.7±0.4 MeV, Г3r=3.6±1.3 MeV) can decay into five free nucleons.
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