Physics Letters B (Aug 2023)
Level structures of 56,58Ca cast doubt on a doubly magic 60Ca
- S. Chen,
- F. Browne,
- P. Doornenbal,
- J. Lee,
- A. Obertelli,
- Y. Tsunoda,
- T. Otsuka,
- Y. Chazono,
- G. Hagen,
- J.D. Holt,
- G.R. Jansen,
- K. Ogata,
- N. Shimizu,
- Y. Utsuno,
- K. Yoshida,
- N.L. Achouri,
- H. Baba,
- D. Calvet,
- F. Château,
- N. Chiga,
- A. Corsi,
- M.L. Cortés,
- A. Delbart,
- J.-M. Gheller,
- A. Giganon,
- A. Gillibert,
- C. Hilaire,
- T. Isobe,
- T. Kobayashi,
- Y. Kubota,
- V. Lapoux,
- H.N. Liu,
- T. Motobayashi,
- I. Murray,
- H. Otsu,
- V. Panin,
- N. Paul,
- W. Rodriguez,
- H. Sakurai,
- M. Sasano,
- D. Steppenbeck,
- L. Stuhl,
- Y.L. Sun,
- Y. Togano,
- T. Uesaka,
- K. Wimmer,
- K. Yoneda,
- O. Aktas,
- T. Aumann,
- L.X. Chung,
- F. Flavigny,
- S. Franchoo,
- I. Gasparic,
- R.-B. Gerst,
- J. Gibelin,
- K.I. Hahn,
- D. Kim,
- T. Koiwai,
- Y. Kondo,
- P. Koseoglou,
- C. Lehr,
- B.D. Linh,
- T. Lokotko,
- M. MacCormick,
- K. Moschner,
- T. Nakamura,
- S.Y. Park,
- D. Rossi,
- E. Sahin,
- P.-A. Söderström,
- D. Sohler,
- S. Takeuchi,
- H. Törnqvist,
- V. Vaquero,
- V. Wagner,
- S. Wang,
- V. Werner,
- X. Xu,
- H. Yamada,
- D. Yan,
- Z. Yang,
- M. Yasuda,
- L. Zanetti
Affiliations
- S. Chen
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong; RIKEN Nishina Center, Wako, Saitama, Japan; School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China; Corresponding author. Present address: Department of Physics, University of York, York, UK.
- F. Browne
- RIKEN Nishina Center, Wako, Saitama, Japan
- P. Doornenbal
- RIKEN Nishina Center, Wako, Saitama, Japan
- J. Lee
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong
- A. Obertelli
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany; IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France; RIKEN Nishina Center, Wako, Saitama, Japan
- Y. Tsunoda
- Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama, Japan
- T. Otsuka
- RIKEN Nishina Center, Wako, Saitama, Japan; Department of Physics, University of Tokyo, Tokyo, Japan; Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Japan
- Y. Chazono
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Japan
- G. Hagen
- Physics Division, Oak Ridge National Laboratory, TN, USA; Department of Physics and Astronomy, University of Tennessee, Tennessee, USA
- J.D. Holt
- TRIUMF, Vancouver, Canada; Department of Physics, McGill University, Montréal, Canada
- G.R. Jansen
- National Center for Computational Sciences, Oak Ridge National Laboratory, TN, USA; Physics Division, Oak Ridge National Laboratory, TN, USA
- K. Ogata
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Japan; Department of Physics, Osaka City University, Osaka, Japan
- N. Shimizu
- Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama, Japan
- Y. Utsuno
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Japan; Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama, Japan
- K. Yoshida
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Japan
- N.L. Achouri
- LPC Caen, Normandie Univ., ENSICAEN, UNICAEN, CNRS/IN2P3, Caen, France
- H. Baba
- RIKEN Nishina Center, Wako, Saitama, Japan
- D. Calvet
- IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
- F. Château
- IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
- N. Chiga
- RIKEN Nishina Center, Wako, Saitama, Japan
- A. Corsi
- IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
- M.L. Cortés
- RIKEN Nishina Center, Wako, Saitama, Japan
- A. Delbart
- IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
- J.-M. Gheller
- IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
- A. Giganon
- IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
- A. Gillibert
- IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
- C. Hilaire
- IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
- T. Isobe
- RIKEN Nishina Center, Wako, Saitama, Japan
- T. Kobayashi
- Department of Physics, Tohoku University, Sendai, Japan
- Y. Kubota
- RIKEN Nishina Center, Wako, Saitama, Japan; Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama, Japan
- V. Lapoux
- IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
- H.N. Liu
- IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany; Department of Physics, Royal Institute of Technology, Stockholm, Sweden
- T. Motobayashi
- RIKEN Nishina Center, Wako, Saitama, Japan
- I. Murray
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France; RIKEN Nishina Center, Wako, Saitama, Japan
- H. Otsu
- RIKEN Nishina Center, Wako, Saitama, Japan
- V. Panin
- RIKEN Nishina Center, Wako, Saitama, Japan
- N. Paul
- IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France; Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS, PSL Research University, Collège de France, Paris, France
- W. Rodriguez
- RIKEN Nishina Center, Wako, Saitama, Japan; Departamento de Física, Pontificia Universidad Javeriana, Bogotá, Colombia; Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia
- H. Sakurai
- RIKEN Nishina Center, Wako, Saitama, Japan; Department of Physics, University of Tokyo, Tokyo, Japan
- M. Sasano
- RIKEN Nishina Center, Wako, Saitama, Japan
- D. Steppenbeck
- RIKEN Nishina Center, Wako, Saitama, Japan
- L. Stuhl
- Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama, Japan; Institute for Nuclear Research, Atomki, Debrecen, Hungary; Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon, Korea
- Y.L. Sun
- IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
- Y. Togano
- Department of Physics, Rikkyo University, Tokyo, Japan
- T. Uesaka
- RIKEN Nishina Center, Wako, Saitama, Japan
- K. Wimmer
- Department of Physics, University of Tokyo, Tokyo, Japan; RIKEN Nishina Center, Wako, Saitama, Japan
- K. Yoneda
- RIKEN Nishina Center, Wako, Saitama, Japan
- O. Aktas
- Department of Physics, Royal Institute of Technology, Stockholm, Sweden
- T. Aumann
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
- L.X. Chung
- Institute for Nuclear Science and Technology, VINATOM, Hanoi, Viet Nam
- F. Flavigny
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
- S. Franchoo
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
- I. Gasparic
- Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia; Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany; RIKEN Nishina Center, Wako, Saitama, Japan
- R.-B. Gerst
- Institut für Kernphysik, Universität zu Köln, Köln, Germany
- J. Gibelin
- LPC Caen, Normandie Univ., ENSICAEN, UNICAEN, CNRS/IN2P3, Caen, France
- K.I. Hahn
- Department of Physics, Ewha Womans University, Seoul, Korea; Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon, Korea
- D. Kim
- Department of Physics, Ewha Womans University, Seoul, Korea; RIKEN Nishina Center, Wako, Saitama, Japan; Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon, Korea
- T. Koiwai
- Department of Physics, University of Tokyo, Tokyo, Japan
- Y. Kondo
- Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
- P. Koseoglou
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
- C. Lehr
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
- B.D. Linh
- Institute for Nuclear Science and Technology, VINATOM, Hanoi, Viet Nam; Vietnam Agency for Radiation and Nuclear Safety, Cau Giay, Hanoi, Viet Nam
- T. Lokotko
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong
- M. MacCormick
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
- K. Moschner
- Institut für Kernphysik, Universität zu Köln, Köln, Germany
- T. Nakamura
- Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
- S.Y. Park
- Department of Physics, Ewha Womans University, Seoul, Korea; Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon, Korea
- D. Rossi
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
- E. Sahin
- Department of Physics, University of Oslo, Oslo, Norway
- P.-A. Söderström
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
- D. Sohler
- Institute for Nuclear Research, Atomki, Debrecen, Hungary
- S. Takeuchi
- Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
- H. Törnqvist
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
- V. Vaquero
- Instituto de Estructura de la Materia, CSIC, Madrid, Spain
- V. Wagner
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
- S. Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
- V. Werner
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
- X. Xu
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong
- H. Yamada
- Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
- D. Yan
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
- Z. Yang
- RIKEN Nishina Center, Wako, Saitama, Japan
- M. Yasuda
- Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
- L. Zanetti
- Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
- Journal volume & issue
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Vol. 843
p. 138025
Abstract
Gamma decays were observed in 56Ca and 58Ca following quasi-free one-proton knockout reactions from 57,59Sc beams at ≈200 MeV/nucleon. For 56Ca, a γ ray transition was measured to be 1456(12) keV, while for 58Ca an indication for a transition was observed at 1115(34) keV. Both transitions were tentatively assigned as the 21+→0gs+ decays, and were compared to results from ab initio and conventional shell-model approaches. A shell-model calculation in a wide model space with a marginally modified effective nucleon-nucleon interaction depicts excellent agreement with experiment for 21+ level energies, two-neutron separation energies, and reaction cross sections, corroborating the formation of a new nuclear shell above the N = 34 shell. Its constituents, the 0f5/2 and 0g9/2 orbitals, are almost degenerate. This degeneracy precludes the possibility for a doubly magic 60Ca and potentially drives the dripline of Ca isotopes to 70Ca or even beyond.
