Resonant states in H 7: Experimental studies of the H 2 (He 8, He 3) reaction
Muzalevskii I.A. Bezbakh A.A. Nikolskii E.Yu. 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.Y. Mauyey B. Mukha I. Parfenova Yu.L. Piatek W. Quynh A.M. Schetinin V.N. Serikov A. Sidorchuk S.I. Sharov P.G. Shulgina N.B. Slepnev R.S. Stepantsov S.V. Swiercz A. Szymkiewicz P. Ter-Akopian G.M. Wolski R. Zalewski B. Zhukov M.V.
April 2021American Physical Society
Physical Review C
2021#103Issue 4
The extremely neutron-rich system H7 was studied in the direct H2(He8,He3)H7 transfer reaction with a 26 AMeV secondary He8 beam [Bezbakh et al., Phys. Rev. Lett. 124, 022502 (2020)PRLTAO0031-900710.1103/PhysRevLett.124.022502]. The missing mass spectrum and center-of-mass angular distributions of H7, as well as the momentum distribution of the H3 fragment in the H7 frame, were constructed. In addition, we carried out another experiment with the same beam but a modified setup, which was cross-checked by the study of the H2(Be10,He3)Li9 reaction. A solid experimental evidence is provided that two resonant states of H7 are located in its spectrum at 2.2(5) and 5.5(3)MeV relative to the H3+4n decay threshold. Also, there are indications that the resonant states at 7.5(3) and 11.0(3)MeV are present in the measured H7 spectrum. Based on the energy and angular distributions, obtained for the studied H2(He8,He3)H7 reaction, the weakly populated 2.2(5)-MeV peak is ascribed to the H7 ground state. It is highly plausible that the firmly ascertained 5.5(3)-MeV state is the 5/2+ member of the H7 excitation 5/2+-3/2+ doublet, built on the 2+ configuration of valence neutrons. The supposed 7.5-MeV state can be another member of this doublet, which could not be resolved in Bezbakh et al. [Phys. Rev. Lett. 124, 022502 (2020)PRLTAO0031-900710.1103/PhysRevLett.124.022502]. Consequently, the two doublet members appeared in the spectrum of H7 in the work mentioned above as a single broad 6.5-MeV peak.
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Flerov Laboratory of Nuclear Reactions, JINR, Dubna, 141980, Russian Federation
Institute of Physics, Silesian University in Opava, Opava, 74601, Czech Republic
National Research Centre Kurchatov Institute, Moscow, 123182, Russian Federation
National Research Nuclear University MEPhI, Moscow, 115409, Russian Federation
Dubna State University, Dubna, 141982, Russian Federation
Heavy Ion Laboratory, University of Warsaw, Warsaw, 02-093, Poland
GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, 64291, Germany
II. Physikalisches Institut, Justus-Liebig-Universität, Giessen, 35392, Germany
Laboratory of Information Technologies, JINR, Dubna, 141980, Russian Federation
L.N. Gumilyov Eurasian National University, Nur-Sultan, 010008, Kazakhstan
Nuclear Research Institute, Dalat, 670000, Viet Nam
Bogoliubov Laboratory of Theoretical Physics, JINR, Dubna, 141980, Russian Federation
AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, 30-059, Poland
Institute of Nuclear Physics PAN, Kraków, 31342, Poland
Department of Physics, Chalmers University of Technology, Göteborg, S-41296, Sweden
Flerov Laboratory of Nuclear Reactions
Institute of Physics
National Research Centre Kurchatov Institute
National Research Nuclear University MEPhI
Dubna State University
Heavy Ion Laboratory
GSI Helmholtzzentrum für Schwerionenforschung GmbH
II. Physikalisches Institut
Laboratory of Information Technologies
L.N. Gumilyov Eurasian National University
Nuclear Research Institute
Bogoliubov Laboratory of Theoretical Physics
AGH University of Science and Technology
Institute of Nuclear Physics PAN
Department of Physics
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