Physics Letters B (Aug 2024)
Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes
- P.J. Li,
- J. Lee,
- P. Doornenbal,
- S. Chen,
- S. Wang,
- A. Obertelli,
- Y. Chazono,
- J.D. Holt,
- B.S. Hu,
- K. Ogata,
- Y. Utsuno,
- K. Yoshida,
- N.L. Achouri,
- H. Baba,
- F. Browne,
- 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,
- K. Boretzky,
- C. Caesar,
- L.X. Chung,
- F. Flavigny,
- S. Franchoo,
- I. Gasparic,
- R.-B. Gerst,
- J. Gibelin,
- K.I. Hahn,
- J. Kahlbow,
- D. Kim,
- T. Koiwai,
- Y. Kondo,
- D. Körper,
- P. Koseoglou,
- C. Lehr,
- B.D. Linh,
- T. Lokotko,
- M. MacCormick,
- K. Miki,
- K. Moschner,
- T. Nakamura,
- S.Y. Park,
- D. Rossi,
- E. Sahin,
- F. Schindler,
- H. Simon,
- P.-A. Söderström,
- D. Sohler,
- S. Takeuchi,
- H. Toernqvist,
- J. Tscheuschner,
- V. Vaquero,
- V. Wagner,
- V. Werner,
- X. Xu,
- H. Yamada,
- D. Yan,
- Z. Yang,
- M. Yasuda,
- L. Zanetti
Affiliations
- P.J. Li
- CAS Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong, China; Corresponding author at: CAS Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
- J. Lee
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong, China; Corresponding author.
- P. Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- S. Chen
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong, China; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; School of Physics, Engineering and Technology, University of York, Heslington, York, YO10 5DD, UK
- S. Wang
- CAS Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- A. Obertelli
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Y. Chazono
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- J.D. Holt
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada; Department of Physics, McGill University, Montréal, Quebec City H3A 2T8, Canada
- B.S. Hu
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada; National Center for Computational Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- K. Ogata
- Department of Physics, Kyushu University, Fukuoka 819-0395, Japan; Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Japan
- Y. Utsuno
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan; Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama 351-0198, Japan
- K. Yoshida
- Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
- N.L. Achouri
- Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen UMR6534, F-14000 Caen, France
- H. Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- F. Browne
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- D. Calvet
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
- F. Château
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
- N. Chiga
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- A. Corsi
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
- M.L. Cortés
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- A. Delbart
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
- J.-M. Gheller
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
- A. Giganon
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
- A. Gillibert
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
- C. Hilaire
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
- T. Isobe
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- T. Kobayashi
- Department of Physics, Tohoku University, Sendai 980-8578, Japan
- Y. Kubota
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama 351-0198, Japan
- V. Lapoux
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
- H.N. Liu
- Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China; Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- T. Motobayashi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- I. Murray
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, F-91405 Orsay cedex, France; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- H. Otsu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- V. Panin
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- N. Paul
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France; Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS, PSL Research University, Collège de France, Case 74, 4 Place Jussieu, 75005 Paris, France
- W. Rodriguez
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Pontificia Universidad Javeriana, Facultad de Ciencias, Departamento de Física, Bogotá, Colombia; Universidad Nacional de Colombia, Sede Bogotá, Facultad de Ciencias, Departamento de Física, Bogotá 111321, Colombia
- H. Sakurai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- M. Sasano
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- D. Steppenbeck
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- L. Stuhl
- Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama 351-0198, Japan; Institute for Nuclear Research, Atomki, P.O. Box 51, Debrecen H-4001, Hungary; Institute for Basic Science, Daejeon 34126, Korea
- Y.L. Sun
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France; Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- Y. Togano
- Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 172-8501, Japan; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- T. Uesaka
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- K. Wimmer
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- K. Yoneda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- O. Aktas
- Department of Physics, Royal Institute of Technology, SE-10691, Stockholm, Sweden
- T. Aumann
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
- K. Boretzky
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
- C. Caesar
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- L.X. Chung
- Institute for Nuclear Science & Technology, VINATOM, 179 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam
- F. Flavigny
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, F-91405 Orsay cedex, France
- S. Franchoo
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, F-91405 Orsay cedex, France
- I. Gasparic
- Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia; Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- R.-B. Gerst
- Institut für Kernphysik, Universität zu Köln, D-50937 Cologne, Germany
- J. Gibelin
- Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen UMR6534, F-14000 Caen, France
- K.I. Hahn
- Ewha Womans University, Seoul 03760, Korea; Institute for Basic Science, Daejeon 34126, Korea
- J. Kahlbow
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- D. Kim
- Ewha Womans University, Seoul 03760, Korea; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Institute for Basic Science, Daejeon 34126, Korea
- T. Koiwai
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- Y. Kondo
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo, 152-8551, Japan
- D. Körper
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
- P. Koseoglou
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
- C. Lehr
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- B.D. Linh
- Institute for Nuclear Science & Technology, VINATOM, 179 Hoang Quoc Viet, Cau Giay, Hanoi, Viet Nam; Vietnam Agency for Radiation and Nuclear Safety, 113 Tran Duy Hung, Cau Giay, Hanoi, Viet Nam
- T. Lokotko
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong, China
- M. MacCormick
- Université Paris-Saclay, CNRS/IN2P3, IJCLab, F-91405 Orsay cedex, France
- K. Miki
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
- K. Moschner
- Institut für Kernphysik, Universität zu Köln, D-50937 Cologne, Germany
- T. Nakamura
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo, 152-8551, Japan
- S.Y. Park
- Ewha Womans University, Seoul 03760, Korea; Institute for Basic Science, Daejeon 34126, Korea
- D. Rossi
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
- E. Sahin
- Department of Physics, University of Oslo, N-0316 Oslo, Norway
- F. Schindler
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- H. Simon
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
- P.-A. Söderström
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; Extreme Light Infrastructure-Nuclear Physics (ELI-NP)/Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH), Str. Reactorulu, Măgurele 077125, Romania
- D. Sohler
- Institute for Nuclear Research, Atomki, P.O. Box 51, Debrecen H-4001, Hungary
- S. Takeuchi
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo, 152-8551, Japan
- H. Toernqvist
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany
- J. Tscheuschner
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- V. Vaquero
- Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
- V. Wagner
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- V. Werner
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- X. Xu
- Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong, China
- H. Yamada
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo, 152-8551, Japan
- D. Yan
- CAS Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- Z. Yang
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- M. Yasuda
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo, 152-8551, Japan
- L. Zanetti
- Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
- Journal volume & issue
-
Vol. 855
p. 138828
Abstract
The calcium isotopes are an ideal system to investigate the evolution of shell structure and magic numbers. Although the properties of surface nucleons in calcium have been well studied, probing the structure of deeply bound nucleons remains a challenge. Here, we report on the first measurement of unbound states in 53Ca and 55Ca, populated from 54,56Ca(p,pn) reactions at a beam energy of around 216 MeV/nucleon at the RIKEN Radioactive Isotopes Beam Factory. The resonance properties, partial cross sections, and momentum distributions of these unbound states were analyzed. Orbital angular momentum l assignments were extracted from momentum distributions based on calculations using the distorted wave impulse approximation (DWIA) reaction model. The resonances at excitation energies of 5516(41)keV in 53Ca and 6000(250)keV in 55Ca indicate a significant l =3 component, providing the first experimental evidence for the ν0f7/2 single-particle strength of unbound hole states in the neutron-rich Ca isotopes. The observed excitation energies and cross-sections point towards extremely localized and well separated strength distributions, with some fragmentation for the ν0f7/2 orbital in 55Ca. These results are in good agreement with predictions from shell-model calculations using the effective GXPF1Bs interaction and ab initio calculations and diverge markedly from the experimental distributions in the nickel isotones at Z=28.
