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Observation of new states of the 7He isotope

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Abstract

The formation of the 7He heavy isotope has been studied in the 11B(π, pt)7He, 11B(π, dd)7He, and 10B(π, pd)7He reactions of absorption of stopped π mesons. No indications of the existence of a low-lying level with E x ∼ 1 MeV have been obtained in any of the three reactions. The existence of three narrow states with excitation energies E x = 3.1(1), 4.90(15), and 6.65(15) MeV has been proven. Highly excited states with E x = 16.9(5) MeV, Γ = 1.0(3) MeV, E x = 19.8(3) MeV, Γ = 1.5(3) MeV, and E x = 24.8(4) MeV, Γ = 4.6(7) MeV have been identified.

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Correspondence to B. A. Chernyshev.

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Original Russian Text © Yu.B. Gurov, L.Yu. Korotkova, S.V. Lapushkin, R.V. Pritula, V.G. Sandukovsky, M.V. Tel’kushev, B.A. Chernyshev, 2015, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2015, Vol. 101, No. 2, pp. 73–77.

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Gurov, Y.B., Korotkova, L.Y., Lapushkin, S.V. et al. Observation of new states of the 7He isotope. Jetp Lett. 101, 69–73 (2015). https://doi.org/10.1134/S0021364015020083

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  • DOI: https://doi.org/10.1134/S0021364015020083

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