First observation of 28 O.

Autor: Kondo Y; Department of Physics, Tokyo Institute of Technology, Tokyo, Japan. kondo@phys.titech.ac.jp.; RIKEN Nishina Center, Saitama, Japan. kondo@phys.titech.ac.jp., Achouri NL; LPC Caen UMR6534, Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, Caen, France., Falou HA; Lebanese University, Beirut, Lebanon.; Lebanese-French University of Technology and Applied Sciences, Deddeh, Lebanon., Atar L; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany., Aumann T; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany.; GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany.; Helmholtz Research Academy Hesse for FAIR, Darmstadt, Germany., Baba H; RIKEN Nishina Center, Saitama, Japan., Boretzky K; GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany., Caesar C; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany.; GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany., Calvet D; Irfu, CEA, Université Paris-Saclay, Gif-sur-Yvette, France., Chae H; Institute for Basic Science, Daejeon, Republic of Korea., Chiga N; RIKEN Nishina Center, Saitama, Japan., Corsi A; Irfu, CEA, Université Paris-Saclay, Gif-sur-Yvette, France., Delaunay F; LPC Caen UMR6534, Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, Caen, France., Delbart A; Irfu, CEA, Université Paris-Saclay, Gif-sur-Yvette, France., Deshayes Q; LPC Caen UMR6534, Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, Caen, France., Dombrádi Z; Atomki, Debrecen, Hungary., Douma CA; ESRIG, University of Groningen, Groningen, The Netherlands., Ekström A; Institutionen för Fysik, Chalmers Tekniska Högskola, Göteborg, Sweden., Elekes Z; Atomki, Debrecen, Hungary., Forssén C; Institutionen för Fysik, Chalmers Tekniska Högskola, Göteborg, Sweden., Gašparić I; RIKEN Nishina Center, Saitama, Japan.; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany.; Ruđer Bošković Institute, Zagreb, Croatia., Gheller JM; Irfu, CEA, Université Paris-Saclay, Gif-sur-Yvette, France., Gibelin J; LPC Caen UMR6534, Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, Caen, France., Gillibert A; Irfu, CEA, Université Paris-Saclay, Gif-sur-Yvette, France., Hagen G; Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, USA., Harakeh MN; GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany.; ESRIG, University of Groningen, Groningen, The Netherlands., Hirayama A; Department of Physics, Tokyo Institute of Technology, Tokyo, Japan., Hoffman CR; Physics Division, Argonne National Laboratory, Argonne, IL, USA., Holl M; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany.; GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany., Horvat A; GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany., Horváth Á; Eötvös Loránd University, Budapest, Hungary., Hwang JW; Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon, Republic of Korea.; Department of Physics and Astronomy, Seoul National University, Seoul, Republic of Korea., Isobe T; RIKEN Nishina Center, Saitama, Japan., Jiang WG; Institutionen för Fysik, Chalmers Tekniska Högskola, Göteborg, Sweden., Kahlbow J; RIKEN Nishina Center, Saitama, Japan.; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany., Kalantar-Nayestanaki N; ESRIG, University of Groningen, Groningen, The Netherlands., Kawase S; Department of Advanced Energy Engineering Science, Kyushu University, Fukuoka, Japan., Kim S; Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon, Republic of Korea.; Department of Physics and Astronomy, Seoul National University, Seoul, Republic of Korea., Kisamori K; RIKEN Nishina Center, Saitama, Japan., Kobayashi T; Department of Physics, Tohoku University, Miyagi, Japan., Körper D; GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany., Koyama S; Department of Physics, The University of Tokyo, Tokyo, Japan., Kuti I; Atomki, Debrecen, Hungary., Lapoux V; Irfu, CEA, Université Paris-Saclay, Gif-sur-Yvette, France., Lindberg S; Institutionen för Fysik, Chalmers Tekniska Högskola, Göteborg, Sweden., Marqués FM; LPC Caen UMR6534, Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, Caen, France., Masuoka S; Center for Nuclear Study, The University of Tokyo, Saitama, Japan., Mayer J; Institut für Kernphysik, Universität zu Köln, Köln, Germany., Miki K; Department of Physics, Tohoku University, Miyagi, Japan., Murakami T; Department of Physics, Kyoto University, Kyoto, Japan., Najafi M; ESRIG, University of Groningen, Groningen, The Netherlands., Nakamura T; Department of Physics, Tokyo Institute of Technology, Tokyo, Japan.; RIKEN Nishina Center, Saitama, Japan., Nakano K; Department of Advanced Energy Engineering Science, Kyushu University, Fukuoka, Japan., Nakatsuka N; Department of Physics, Kyoto University, Kyoto, Japan., Nilsson T; Institutionen för Fysik, Chalmers Tekniska Högskola, Göteborg, Sweden., Obertelli A; Irfu, CEA, Université Paris-Saclay, Gif-sur-Yvette, France., Ogata K; Department of Physics, Kyushu University, Fukuoka, Japan.; Research Center for Nuclear Physics, Osaka University, Osaka, Japan.; Department of Physics, Osaka City University, Osaka, Japan., de Oliveira Santos F; Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France., Orr NA; LPC Caen UMR6534, Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, Caen, France., Otsu H; RIKEN Nishina Center, Saitama, Japan., Otsuka T; RIKEN Nishina Center, Saitama, Japan.; Department of Physics, The University of Tokyo, Tokyo, Japan., Ozaki T; Department of Physics, Tokyo Institute of Technology, Tokyo, Japan., Panin V; RIKEN Nishina Center, Saitama, Japan., Papenbrock T; Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, USA., Paschalis S; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany., Revel A; LPC Caen UMR6534, Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, Caen, France.; Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France., Rossi D; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany., Saito AT; Department of Physics, Tokyo Institute of Technology, Tokyo, Japan., Saito TY; Department of Physics, The University of Tokyo, Tokyo, Japan., Sasano M; RIKEN Nishina Center, Saitama, Japan., Sato H; RIKEN Nishina Center, Saitama, Japan., Satou Y; Department of Physics and Astronomy, Seoul National University, Seoul, Republic of Korea., Scheit H; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany., Schindler F; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany., Schrock P; Center for Nuclear Study, The University of Tokyo, Saitama, Japan., Shikata M; Department of Physics, Tokyo Institute of Technology, Tokyo, Japan., Shimizu N; Center for Computational Sciences, University of Tsukuba, Ibaraki, Japan., Shimizu Y; RIKEN Nishina Center, Saitama, Japan., Simon H; GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany., Sohler D; Atomki, Debrecen, Hungary., Sorlin O; Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DRF-CNRS/IN2P3, Caen, France., Stuhl L; RIKEN Nishina Center, Saitama, Japan.; Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon, Republic of Korea., Sun ZH; Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN, USA., Takeuchi S; Department of Physics, Tokyo Institute of Technology, Tokyo, Japan., Tanaka M; Department of Physics, Osaka University, Osaka, Japan., Thoennessen M; Facility for Rare Isotope Beams, Michigan State University, East Lansing, MI, USA., Törnqvist H; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany.; GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany., Togano Y; Department of Physics, Tokyo Institute of Technology, Tokyo, Japan.; Department of Physics, Rikkyo University, Tokyo, Japan., Tomai T; Department of Physics, Tokyo Institute of Technology, Tokyo, Japan., Tscheuschner J; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany., Tsubota J; Department of Physics, Tokyo Institute of Technology, Tokyo, Japan., Tsunoda N; Center for Nuclear Study, The University of Tokyo, Saitama, Japan., Uesaka T; RIKEN Nishina Center, Saitama, Japan., Utsuno Y; Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki, Japan., Vernon I; Department of Mathematical Sciences, Durham University, Durham, UK., Wang H; RIKEN Nishina Center, Saitama, Japan., Yang Z; RIKEN Nishina Center, Saitama, Japan., Yasuda M; Department of Physics, Tokyo Institute of Technology, Tokyo, Japan., Yoneda K; RIKEN Nishina Center, Saitama, Japan., Yoshida S; Liberal and General Education Center, Institute for Promotion of Higher Academic Education, Utsunomiya University, Tochigi, Japan.
Jazyk: angličtina
Zdroj: Nature [Nature] 2023 Aug; Vol. 620 (7976), pp. 965-970. Date of Electronic Publication: 2023 Aug 30.
DOI: 10.1038/s41586-023-06352-6
Abstrakt: Subjecting a physical system to extreme conditions is one of the means often used to obtain a better understanding and deeper insight into its organization and structure. In the case of the atomic nucleus, one such approach is to investigate isotopes that have very different neutron-to-proton (N/Z) ratios than in stable nuclei. Light, neutron-rich isotopes exhibit the most asymmetric N/Z ratios and those lying beyond the limits of binding, which undergo spontaneous neutron emission and exist only as very short-lived resonances (about 10 -21  s), provide the most stringent tests of modern nuclear-structure theories. Here we report on the first observation of 28 O and 27 O through their decay into 24 O and four and three neutrons, respectively. The 28 O nucleus is of particular interest as, with the Z = 8 and N = 20 magic numbers 1,2 , it is expected in the standard shell-model picture of nuclear structure to be one of a relatively small number of so-called 'doubly magic' nuclei. Both 27 O and 28 O were found to exist as narrow, low-lying resonances and their decay energies are compared here to the results of sophisticated theoretical modelling, including a large-scale shell-model calculation and a newly developed statistical approach. In both cases, the underlying nuclear interactions were derived from effective field theories of quantum chromodynamics. Finally, it is shown that the cross-section for the production of 28 O from a 29 F beam is consistent with it not exhibiting a closed N = 20 shell structure.
(© 2023. The Author(s), under exclusive licence to Springer Nature Limited.)
Databáze: MEDLINE
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