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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; Kozlov, M. Yu; Mauyey, B; Mukha, I; Muzalevskii, I. A; Nikolskii, E. Yu; 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

    06/2019
    Journal Article

    Phys. Rev. Lett. 124, 022502 (2020) 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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