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1Searches for the Superheavy Hydrogen Isotope 7H in the Absorption of Stopped Π − Mesons

Yu. B. Gurov,D. V. Aleshkin,S. V. Lapushkin,I. V. Laukhin,V. A. Pechkurov,N. O. Poroshin,V. G. Sandukovsky,M. V. Tel’kushev,B. A. Chernyshev

Experimental searches for the superheavy hydrogen isotope 7 H were performed in reactions involving the absorption of stopped π − mesons on 9 Be and 11 B nuclei. In the reaction 9 Be( π − , pp ) X , the missing-mass spectrum shows evidence for the formation of 7 H states, that of E r = 16 ± 1 MeV and Γ ≅ 2 MeV and that of E r = 21 ± 1 MeV and Γ ≅ 5 MeV ( E r is the resonance energy with respect to breakup into a trition and four neutrons, and Γ is the observed level width).

2006Physics of Atomic Nuclei（2006）引用：9

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2Spectroscopy of Superheavy Hydrogen Isotopes 4H and 5H

Yu. B. Gurov,M. N. Behr,D. V. Aleshkin,B. A. Chernyshev,S. V. Lapushkin,P. V. Morokhov,V. A. Pechkurov,N. O. Poroshin,V. G. Sandukovsky,M. V. Tel’kushev

. The superheavy hydrogen isotopes 4 H and 5 H have been investigated in the stopped pion absorption on 9 Be. Three states of 4 H were proposed in the reaction channel 9 Be( π { - } , dt) X . Four states of 5 H were proposed in the reaction channels 9 Be(π { - } , pt) X and 9 Be(π { - } , dt) X . The excited states of 5 H can decay into free nucleons.

2005The European Physical Journal A - Hadrons and Nuclei（2005）引用：25

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3Spectroscopy of Superheavy Hydrogen Isotopes in Stopped-Pion Absorption by Nuclei

Yu. B. Gurov,D. V. Aleshkin,M. N. Behr,S. V. Lapushkin,P. V. Morokhov,V. A. Pechkurov,N. O. Poroshin,V. G. Sandukovsky,M. V. Tel’kushev,B. A. Chernyshev, T. D. Tschurenkova

The structure of levels of superheavy hydrogen isotopes 4–6 H 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 5 H and 6 H. Peaks due to four resonance states of 5 H are observed in the missing-mass spectra for the reaction channels 9 Be( π − , pt ) X and 9 Be(π − , dd ) X . A structure that is associated with four resonance states of 6 H is observed in the missing-mass spectra for the reaction channels 9 Be(π − , pd ) X and 11 B(π − , p 4 He) 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 5 H and 6 H are observed for the first time. On the energy scale, all of these states lie above the threshold for decay to free nucleons.

2005Physics of Atomic Nuclei（2005）引用：7

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4The Formation of the Superheavy Hydrogen Isotope 6 H in the Absorption of Stopped Π − -Mesons by Nuclei

Yu. B. Gurov,D. V. Aleshkin,S. V. Lapushkin,P. V. Morokhov,A. V. Panin,V. A. Pechkurov,N. O. Poroshin,V. G. Sandukovsky,M. V. Tel’kushev,B. A. Chernyshev

An experimental search for the superheavy hydrogen isotope 6 H was conducted through studying the absorption of stopped π − -mesons by 9 Be and 11 B nuclei. A structure in the missing mass spectrum caused by the resonance states of 6 H was observed in three reaction channels, namely, 9 Be(π − , pd )X, 11 B(π − , d 3 He)X, and 11 B(π − , p 4 He)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 6 H is a more weakly bound system than 4 H and 5 H. Three excited states of 6 H were observed. Their resonance levels ( E 1 r =10.7±0.7 MeV, Γ 1 r =4±2 MeV, E 2 r =15.3±0.7 MeV, Γ 2 r =3±2 MeV, and E 3 r =21.3±0.4 MeV, Γ 3 r =3.5±1.0 MeV) are energetically capable of disintegrating into six free nucleons.

2003JETP LETTERS（2003）引用：7

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