H 6 states studied in the H 2 (He 8, He 4) reaction and evidence of an extremely correlated character of the H 5 ground state
Nikolskii E.Yu. Muzalevskii I.A. 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. Khirk M. Kiselev O. Kostyleva D.A. Kozlov M.Yu. 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.
June 2022American Physical Society
Physical Review C
2022#105Issue 6
The extremely neutron-rich system H6 was studied in the direct H2(He8,He4)H6 transfer reaction with a 26A MeV secondary He8 beam. The measured missing mass spectrum shows a broad bump at ≈4-8 MeV above the H3+3n decay threshold. This bump can be interpreted as a broad resonant state in H6 at 6.8(5) MeV. The population cross section of such a presumably p-wave state (or it may be few overlapping states) in the energy range from 4 to 8 MeV is dσ/dωc.m.≃190-80+40μb/sr in the angular range 5°<θc.m.<16°. The obtained missing mass spectrum is practically free of H6 events below 3.5 MeV (dσ/dωc.m. 5μb/sr in the same angular range). The steep rise of the H6 missing mass spectrum at ≈3 MeV allows us to derive the lower limit for the possible resonant-state energy in H6 to be 4.5(3) MeV. According to the paring energy estimates, such a 4.5(3) MeV resonance is a realistic candidate for the H6 ground state (g.s.). The obtained results confirm that the decay mechanism of the H7 g.s. (located at 2.2 MeV above the H3+4n threshold) is the true(or simultaneous) 4n emission. The resonance energy profiles and the momentum distributions of fragments of the sequential H6→H5(g.s.)+n→H3+3n decay were analyzed by the theoretically updated direct four-body-decay and sequential-emission mechanisms. The measured momentum distributions of the H3 fragments in the H6 rest frame indicate very strong dineutron-typecorrelations in the H5 ground state decay.
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National Research Centre Kurchatov Institute, Kurchatov Square 1, Moscow, 123182, Russian Federation
Flerov Laboratory of Nuclear Reactions, JINR, Dubna, 141980, Russian Federation
Institute of Physics, Silesian University in Opava, Opava, 74601, Czech Republic
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
Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, 119991, Russian Federation
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
Institute of Nuclear Physics, Almaty, 050032, 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, Radzikowskiego 152, Kraków, 31342, Poland
Department of Physics, Chalmers University of Technology, Göteborg, S-41296, Sweden
National Research Centre Kurchatov Institute
Flerov Laboratory of Nuclear Reactions
Institute of Physics
National Research Nuclear University MEPhI
Dubna State University
Heavy Ion Laboratory
Skobeltsyn Institute of Nuclear Physics
GSI Helmholtzzentrum für Schwerionenforschung GmbH
II. Physikalisches Institut
Laboratory of Information Technologies
Institute of Nuclear Physics
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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