Spectroscopy of superheavy hydrogen isotopes in stopped-pion absorption by nuclei
- Cite this article as:
- Gurov, Y.B., Aleshkin, D.V., Behr, M.N. et al. Phys. Atom. Nuclei (2005) 68: 491. doi:10.1134/1.1891200
The structure of levels of superheavy hydrogen isotopes 4–6H is analyzed on the basis of a record statistics of experimental data on the absorption of negatively charged pions by light nuclei. Qualitatively new experimental data are obtained for the spectroscopy of the superheavy hydrogen isotopes 5H and 6H. Peaks due to four resonance states of 5H are observed in the missing-mass spectra for the reaction channels 9Be(π−, pt)X and 9Be(π−, dd)X. A structure that is associated with four resonance states of 6H is observed in the missing-mass spectra for the reaction channels 9Be(π−, pd)X and 11B(π−, p4He)X. On the basis of the results presented for ground-state parameters, it can be concluded that the binding energy of superheavy hydrogen isotopes decreases as the number of neutrons increases. Excited levels of the isotopes 5H and 6H are observed for the first time. On the energy scale, all of these states lie above the threshold for decay to free nucleons.