Physics Letters B (Nov 2024)
Triaxial deformation of neutron-rich Zr nuclei explored by high-resolution in-beam γ-ray spectroscopy
- B. Moon,
- W. Korten,
- K. Wimmer,
- P. Doornenbal,
- T.R. Rodríguez,
- N. Aoi,
- H. Baba,
- F. Browne,
- C. Campbell,
- S. Chen,
- H. Crawford,
- H. de Witte,
- C. Fransen,
- H. Hess,
- E. Ideguchi,
- S. Iwazaki,
- J. Kim,
- N. Kitamura,
- A. Kohda,
- T. Koiwai,
- B. Mauss,
- R. Mizuno,
- M. Niikura,
- T. Parry,
- P. Reiter,
- H. Sakurai,
- D. Suzuki,
- R. Taniuchi,
- S. Thiel,
- Y. Yamamoto
Affiliations
- B. Moon
- Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon 34126, Republic of Korea; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Corresponding author at: Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon 34126, Republic of Korea.
- W. Korten
- IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
- K. Wimmer
- GSI Helmoltzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany; Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain; 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
- P. Doornenbal
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- T.R. Rodríguez
- Departamento de Estructura de la Materia, Física Térmica y Electrónica and IPARCOS, Universidad Complutense de Madrid, 28040 Madrid, Spain
- N. Aoi
- Research Center for Nuclear Physics (RCNP), Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
- 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
- C. Campbell
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- S. Chen
- School of Physics, Engineering and Technology, University of York, Heslington, York YO10 5DD, United Kingdom; Department of Physics, The University of Hong Kong, Pokfulam 999077, Hong Kong
- H. Crawford
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- H. de Witte
- Institute for Nuclear and Radiation Physics, KU Leuven, Leuven B-3001, Belgium
- C. Fransen
- Institut für Kernphysik, Universität zu Köln, D-50937 Cologne, Germany
- H. Hess
- Institut für Kernphysik, Universität zu Köln, D-50937 Cologne, Germany
- E. Ideguchi
- Research Center for Nuclear Physics (RCNP), Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
- S. Iwazaki
- Research Center for Nuclear Physics (RCNP), Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
- J. Kim
- Department of Physics, Korea University, Seoul 02841, Republic of Korea; Center for Extreme Nuclear Matters, Korea University, Seoul 02841, Republic of Korea
- N. Kitamura
- Center for Nuclear Study, University of Tokyo, RIKEN campus, Wako, Saitama 351-0198, Japan
- A. Kohda
- Research Center for Nuclear Physics (RCNP), Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
- T. Koiwai
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- B. Mauss
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- R. Mizuno
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- M. Niikura
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
- T. Parry
- Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
- P. Reiter
- Institut für Kernphysik, Universität zu Köln, D-50937 Cologne, Germany
- 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
- D. Suzuki
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- R. Taniuchi
- School of Physics, Engineering and Technology, University of York, Heslington, York YO10 5DD, United Kingdom
- S. Thiel
- Institut für Kernphysik, Universität zu Köln, D-50937 Cologne, Germany
- Y. Yamamoto
- Research Center for Nuclear Physics (RCNP), Osaka University, Mihogaoka, Ibaraki, Osaka 567-0047, Japan
- Journal volume & issue
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Vol. 858
p. 139047
Abstract
Lifetimes of excited states in the very exotic nuclides 108Zr68 and 110Zr70 were measured for the first time applying high-resolution in-beam γ-ray spectroscopy at relativistic energies. The experiment was carried out at the Radioactive Isotope Beam Factory in RIKEN, using nucleon removal reactions of radioactive Nb ions to produce 108Zr and 110Zr. Emitted γ rays from the excited states were measured by the High-resolution Cluster Array at RIBF (HiCARI) and lifetimes were extracted from the observed line shapes caused by relativistic Doppler-shift effects. In addition to the new lifetime information, the precision of the E(21+) and R4/2=E(41+)/E(21+) values of 110Zr could be significantly improved. The low-lying 22+ states in both nuclei are also newly observed, which are indicative of the triaxiality. The various physical quantities were compared with theoretical models to investigate the collectivity in Zr isotopes towards N=70. Together the experimental and theoretical results point at a reduction of the axial deformation while triaxial collectivity increases.
