Population of tetraneutron continuum in reactions of He 8 on deuterium
Muzalevskii I.A. Shulgina N.B. Bezbakh A.A. Chudoba V. Krupko S.A. Belogurov S.G. Biare D. Egorova I.A. 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. Nikolskii E.Yu. Parfenova Yu.L. Piatek W. Quynh A.M. Serikov A. Sidorchuk S.I. Sharov P.G. Slepnev R.S. Stepantsov S.V. Swiercz A. Szymkiewicz P. Ter-Akopian G.M. Zalewski B.
January 2025American Physical Society
Physical Review C
2025#111Issue 1
Search for the population of the low-energy continuum of a tetraneutron system was performed for reactions of a He8 beam on a deuterium target. These studies are based on the data [I. A. Muzalevskii, Phys. Rev. C 103, 044313 (2021)2469-998510.1103/PhysRevC.103.044313] previously used for the studies of H7 and H6 in the H2(He8,He3)7H and H2(He8,He4)H6 reactions. Evidence for a hump in the n4 continuum at 3.5±0.7 and 3.2±0.8MeV was observed in the H2(He8,Li6)n4 and H2(He8,He3)H7→H3+n4 reactions, respectively. The observed statistics is quite low (6 events and up to 40 events) corresponding to very low cross sections of few microbarns or tens of microbarns. The background conditions for the H2(He8,Li6)n4 reaction are shown to be good, favoring the physical nature of the observed events. The H2(He8,He3)H7→H3+n4 process transforms to the H2(He8,Li∗6)n4 reaction in the limit of the highest H7 decay energies. The population of the low-energy region in the n4 spectrum is found to be perfectly correlated with the population of the lowest Li6 state in the He3+H3 continuum with E∗=18MeV. Theoretical calculations of He8 in five-body α+4n and of n4 in four-body hyperspherical models are presented. The He8 wave function is shown to contain strong specific correlations, which may give rise to very low-energy structures in the tetraneutron continuum in extreme-peripheral reaction scenarios.
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Flerov Laboratory of Nuclear Reactions, JINR, Dubna, 141980, Russian Federation
National Research Centre Kurchatov Institute, Kurchatov Square 1, Moscow, 123182, Russian Federation
Bogoliubov Laboratory of Theoretical Physics, 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
AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, 30-059, Poland
Flerov Laboratory of Nuclear Reactions
National Research Centre Kurchatov Institute
Bogoliubov Laboratory of Theoretical Physics
Institute of Physics
National Research Nuclear University
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
AGH University of Science and Technology
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