Publication: 8He Spectroscopy with Stopped-Pion Absorption by 12C and 14C
Дата
2019
Авторы
Gurov, Y. B.
Lapushkin, S. V.
Leonova, T. I.
Sandukovsky, V. G.
Chernyshev, B. A.
Леонова, Татьяна Игоревна
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© 2019, Allerton Press, Inc.Abstract: The structure of the levels of heavy helium isotope 8He is investigated using the reactions of stopped-pion absorption by carbon isotopes 12С(π−, p3He)X, 14С(π−, d4He)X, and 14С(π−, t3He)X. Measurements are made with the two-arm multilayer semiconductor spectrometer at the LANL accelerator. Excited states of the 8He nucleus with energies of excitation of up to ~ 20 MeV are sought using the measured missing-mass spectra for these reactions. An excited state with Ex ≈ 6.4 MeV and Г ≤ 1 MeV is observed for the first time. Its structure is probably due to two valence nucleons on the (1p1/2)2 shell.
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8He Spectroscopy with Stopped-Pion Absorption by 12C and 14C / Gurov, Y.B. [et al.] // Bulletin of the Russian Academy of Sciences: Physics. - 2019. - 83. - № 4. - P. 479-482. - 10.3103/S1062873819040129