Triaxial deformation of neutron-rich Zr nuclei explored by high-resolution in-beam γ-ray spectroscopy
Lifetimes of excited states in the very exotic nuclides 108 Zr 68 and 110 Zr 70 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 108 Zr and 110 Zr. 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 ( 2 1 + ) and R 4 / 2 = E ( 4 1 + ) / E ( 2 1 + ) values of 110 Zr could be significantly improved. The low-lying 2 2 + 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.
Authors
- S. Chen
- Hans De Witte (ORCID: https://orcid.org/0000-0002-6691-517X)
- P. Reiter (ORCID: https://orcid.org/0000-0003-3016-8210)
- B. Mauss
- Daisuke Suzuki (ORCID: https://orcid.org/0000-0002-5843-9433)
- W. Korten (ORCID: https://orcid.org/0000-0002-3940-0816)
- T. Koiwai
- Rurie Mizuno (ORCID: https://orcid.org/0009-0003-1137-0306)
- N. Aoi
- F. Browne (ORCID: https://orcid.org/0000-0002-2409-4019)
- T. Rodrı́guez (ORCID: https://orcid.org/0000-0002-3516-8239)
- E. Ideguchi
- M. Nııkura (ORCID: https://orcid.org/0000-0002-5940-2667)
- H. Baba
- Tony Parry (ORCID: https://orcid.org/0000-0002-7327-1448)
- Yasuo Yamamoto (ORCID: https://orcid.org/0000-0002-8510-7266)
- Stefan Thiel
- R. Taniuchi (ORCID: https://orcid.org/0000-0002-8057-7074)
- K. Wimmer
- P. Doornenbal (ORCID: https://orcid.org/0000-0001-7530-4066)
- H. Sakuraï (ORCID: https://orcid.org/0000-0002-6215-4254)
- N. Kitamura (ORCID: https://orcid.org/0009-0002-8345-8481)
- C. M. Campbell (ORCID: https://orcid.org/0000-0003-3577-4316)
- B. Moon (ORCID: https://orcid.org/0000-0001-7477-2319)
- S. Iwazaki
- Jae-Hwan Kim (ORCID: https://orcid.org/0000-0002-2095-3031)
- H. Hess
- C. Fransen
- H.J. Crawford
- A. Kohda
Institutions
- Universidad Complutense de Madrid (ES)
- Lawrence Berkeley National Laboratory (US)
- GSI Helmholtz Centre for Heavy Ion Research (DE)
- University of Cologne (DE)
- Korea University (KR)
- Rega Institute for Medical Research (BE)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- Université Paris-Saclay (FR)
- Institute for Basic Science (KR)
- RIKEN (JP)
- VIB-KU Leuven Center for Microbiology (BE)
- CEA Paris-Saclay (FR)
- Instituto de Estructura de la Materia (ES)
- RIKEN Nishina Center (JP)
- Institut de Recherche sur les Lois Fondamentales de l'Univers (FR)
- University of York (GB)
- The University of Tokyo (JP)
- University of Hong Kong (HK)
- The University of Osaka (JP)
Publication Details
- Journal
- Physics Letters B
- Published
- 2024-10-03
- DOI
- https://doi.org/10.1016/j.physletb.2024.139047
- Citations
- 5
- Primary Topic
- Nuclear physics research studies
- Type
- article
- Field-Weighted Citation Impact
- 3.30
Funders
- Ministerio de Ciencia, Innovación y Universidades
- Royal Society
- National Research Foundation
- Bundesministerium für Bildung und Forschung
- Chinese Academy of Sciences
- National Research Foundation of Korea
- Ministerio de Ciencia e Innovación
- Institute for Basic Science
- Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie
- Japan Society for the Promotion of Science
- H2020 European Research Council