The 7H system was populated in the 2H(8He,3He)7H reaction with a 26 AMeV 8He beam. The 7H missing mass energy spectrum, the 3H energy and angular distributions in the 7H decay frame were reconstructed. The 7H 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 7H located at 2.0(5) MeV with quite a low population cross section of ∼10μb/sr within angular range θcm≃6∘−30∘.
@article{arxiv.1906.07818,
title = {Observation of the $^7$H excited state},
author = {A. A. Bezbakh and V. Chudoba and S. A. Krupko and S. G. Belogurov and D. Biare and A. S. Fomichev and E. M. Gazeeva and A. V. Gorshkov and L. V. Grigorenko and G. Kaminski and O. Kiselev and D. A. Kostyleva and M. Yu. Kozlov and B. Mauyey and I. Mukha and I. A. Muzalevskii and E. Yu. Nikolskii and Yu. L. Parfenova and W. Piatek and A. M. Quynh and V. N. Schetinin and A. Serikov and S. I. Sidorchuk and P. G. Sharov and R. S. Slepnev and S. V. Stepantsov and A. Swiercz and P. Szymkiewicz and G. M. Ter-Akopian and R. Wolski and B. Zalewski and M. V. Zhukov},
journal= {arXiv preprint arXiv:1906.07818},
year = {2020}
}