Search for superheavy hydrogen isotopes 4,5H in reactions of pion absorption by 10,11B nuclei

The results of searching for production of superheavy hydrogen isotopes 4,5 H in reactions of absorption of stopped π − mesons by 10,11 B nuclei are reported. A peak near 3 MeV was observed in the missing mass spectra measured in the reactions 10,11 B(π − , t 4 He) X , 10 B(π − , d 4 He) X , and 10 B(π − , t 3 He) X . A structure caused by two 5 H states with the resonance energies E R = 5.2 and 10.4 MeV was observed in the missing mass spectra measured in the reactions 11 B(π − , d 4 He) X , 11 B(π − , t 3 He) X , and 10 B(π − , d 3 He) X .