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.

arxiv（2019）

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Abstract

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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