Abstract
An experimental search for the superheavy hydrogen isotope 6H was conducted through studying the absorption of stopped π−-mesons by 9Be and 11B nuclei. A structure in the missing mass spectrum caused by the resonance states of 6H was observed in three reaction channels, namely, 9Be(π−, pd)X, 11B(π−, d 3He)X, and 11B(π−, p 4He)X. The parameters of the lowest state E r=6.6±0.7 MeV and Γ=5.5±2.0 MeV (E r is the resonance energy with respect to the disintegration into the triton and three neutrons) are evidence that 6H is a more weakly bound system than 4H and 5H. Three excited states of 6H were observed. Their resonance levels (E 1r =10.7±0.7 MeV, Γ1r =4±2 MeV, E 2r =15.3±0.7 MeV, Γ 2r =3±2 MeV, and E 3r =21.3±0.4 MeV, Γ3r =3.5±1.0 MeV) are energetically capable of disintegrating into six free nucleons.
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Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 78, No. 4, 2003, pp. 219–223.
Original Russian Text Copyright © 2003 by Gurov, Aleshkin, Lapushkin, Morokhov, Panin, Pechkurov, Poroshin, Sandukovsky, Tel’kushev, Chernyshev.
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Gurov, Y.B., Aleshkin, D.V., Lapushkin, S.V. et al. The formation of the superheavy hydrogen isotope 6H in the absorption of stopped π−-mesons by nuclei. Jetp Lett. 78, 183–187 (2003). https://doi.org/10.1134/1.1622028
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DOI: https://doi.org/10.1134/1.1622028