Interfering reaction channels observed in the ²H(⁸He,⁴He)⁶H reaction studies

¹ Institute of Physics, Silesian University in Opava, 74601 Opava, Czech Republic
² Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Russia
³ National Research Centre “Kurchatov Institute”, Kurchatov sq. 1, 123182 Moscow, Russia
⁴ National Research Nuclear University “MEPhI”, 115409 Moscow, Russia
⁵ Dubna State University, 141982 Dubna, Russia
⁶ GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
⁷ L.N. Gumilyov Eurasian National University, 010008 Nur-Sultan, Kazakhstan
⁸ Nuclear Research Institute, 670000 Dalat, Vietnam
⁹ Voronezh state university, Universitetskaya sq. 1, 394018 Voronezh
¹⁰ Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna, Russia
¹¹ Department of Physics, Chalmers University of Technology, S-41296 Göteborg, Sweden

^* e-mail: muzalevsky@jinr.ru

Published online: 8 December 2023

Abstract

In the recent work [Nikolskii et al., Phys. Rev. C 105, 064605 (2022)] the ²H(⁸He,⁴He)⁶H reaction was used for the study of the extreme neutron-rich 6H isotope. A broad bump was observed in the measured ⁶H spectrum interpreted as the broad overlapping ground and some low-lying states of this nuclide. There could be certain doubts in the interpretation of this work: in conditions of the limited phase space it is not impossible that the structure in the missing mass spectrum of ⁶H is actually induced by the resonant states populated by some other channels opened in the ⁸He+²H interaction. This work provides a body of the evidence for the correct channel identification and for the absence of the ⁶H resonances at energy E_T = 0 − 3.5 MeV above the ³H+3n decay threshold. In addition the first strong experimental evidence is given that the ⁶H → ⁵H*+n → ³H+3n sequential decay is the dominating ⁶H decay channel.