Observation of the \(^7\)H excited state

• Published in: arXiv.org
• Main Authors: 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
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 24.06.2019
• Subjects: Energy spectra; Missing mass (astrophysics)
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1906.07818

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 \(\theta_{\text{cm}} \simeq 6^{\circ} - 30^{\circ}\).