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  • Observation of the \(^7\)H excited state
    Bezbakh, A A; Chudoba, V; Krupko, S A; Belogurov, S G; Biare, D; Fomichev, A S; Gazeeva, E M; Gorshkov, A V; Grigorenko, L V; Kaminski, G; Kiselev, O; Kostyleva, D A; M Yu Kozlov; Mauyey, B; Mukha, I; Muzalevskii, I A; E Yu Nikolskii; Parfenova, Yu L; Piatek, W; Quynh, A M; Schetinin, V N; Serikov, A; Sidorchuk, S I; Sharov, P G; Slepnev, R S; Stepantsov, S V; Swiercz, A; Szymkiewicz, P; Ter-Akopian, G M; Wolski, R; Zalewski, B; Zhukov, M V

    arXiv.org, 06/2019
    Paper

    The \(^7\)H system was populated in the \(^2\)H(\(^8\)He,\(^3\)He)\(^7\)H reaction with a 26 AMeV \(^8\)He beam. The \(^{7}\)H missing mass energy spectrum, the \(^{3}\)H energy and angular distributions in the \(^7\)H decay frame were reconstructed. The \(^7\)H missing mass spectrum shows a peak which can be interpreted either as unresolved \(5/2^+\) and \(3/2^+\) doublet or one of these states at 6.5(5) MeV. The data also provide indications on the \(1/2^+\) ground state of \(^7\)H located at 2.0(5) MeV with quite a low population cross section of \(\sim 10\) \(\mu\)b/sr within angular range \(\theta_{\text{cm}} \simeq 6^{\circ} - 30^{\circ}\).

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