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Title: Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy

Journal Article · · Physics Letters B
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  1. Beihang Univ., Beijing (China)
  2. Beihang Univ., Beijing (China); RIKEN Nishina Center, Saitama (Japan)
  3. Australian National Univ., Canberra (Australia)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Univ. of Surrey, Guildford (United Kingdom); National Physical Lab., Middlesex (United Kingdom)
  6. RIKEN Nishina Center, Saitama (Japan)
  7. Univ. of Surrey, Guildford (United Kingdom)
  8. Kyoto Univ., Kyoto (Japan)
  9. Osaka Univ., Toyonaka (Japan)
  10. MTA Atomki, Debrecen (Hungary)
  11. Chung-Ang Univ., Seoul (Republic of Korea)
  12. The Univ. of Hong Kong (Hong Kong)
  13. RIKEN Nishina Center, Saitama (Japan); Peking Univ., Beijing (China)
  14. Majmaah Univ., Majmaah (Saudi Arabia)
  15. Univ. of Brighton, Brighton (United Kingdom)
  16. Sungkyunkwan Univ., Suwon (Republic of Korea)
  17. Argonne National Lab. (ANL), Argonne, IL (United States); U.S. Army Research Lab., Adelphi, MD (United States)
  18. Univ. of Edinburgh, Edinburgh (United Kingdom)
  19. Osaka Univ., Osaka (Japan)
  20. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)
  21. RIKEN Nishina Center, Saitama (Japan); Univ. of Surrey, Guildford (United Kingdom); National Physics Lab., Middlesex (United Kingdom)
  22. Hoseo Univ., Chung-Nam (Republic of Korea)
  23. Tohoku Univ. Miyagi (Japan)
  24. Univ. of Brighton, Brighton (United Kingdom); Horia Hulubei National Institute for R & D in Physics and Nuclear Engineering (IFIN-HH), Bucharest-Magurele (Romania)
  25. RIKEN Nishina Center, Saitama (Japan); VNU Hanoi Univ. of Science, Hanoi (Viet Nam)
  26. Univ. College Dublin, Dublin (United Kingdom)
  27. Tohoku Univ., Miyagi (Japan)
  28. Istituto Nazionale di Fisica Nucleare, Legnaro (Italy)
+ Show Author Affiliations

The neutron-rich dysprosium isotopes 168Dy102 and 169Dy103 have been investigated using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity uranium beam in conjunction with isotope separation through the BigRIPS separator at RIBF in RIKEN Nishina Center. For 168Dy, a previously unreported isomer with a half-life of 0.57(7) μs has been identified at an excitation energy of 1378 keV, and its presence affirmed independently using γ-γ-γ coincidence data taken with Gammasphere via two-proton transfer from an enriched 170Er target performed at Argonne National Laboratory. This isomer is assigned Jπ = Kπ = (4¯) based on the measured transition strengths, decay patterns, and the energy systematics for two-quasiparticle states in N = 102 isotones. The underlying mechanism of two-quasiparticle excitations in the doubly midshell region is discussed in comparison with the deformed QRPA and multi-quasiparticle calculations. In 169Dy, the B(E2) value for the transition de-exciting the previously unreported Kπ = (1/2¯) isomeric state at 166 keV to the Kπ = (1/2¯) ground state is approximately two orders of magnitude larger than the E2 strength for the corresponding isomeric-decay transition in the N = 103 isotone 173Yb, suggesting the presence of a significant γ-vibrational admixture with a dominant neutron one-quasiparticle component in the isomeric state.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Saha Institute of Nuclear Physics; USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357; 2017M2A2A6A02071071; 2016R1D1A1A09917463; 2014S1A2A2028636; 2016K1A3A7A09005579; FT100100991
OSTI ID:
1571356
Alternate ID(s):
OSTI ID: 1581003
Journal Information:
Physics Letters B, Vol. 799, Issue C; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

References (36)

Self-consistent description of dysprosium isotopes in the doubly midshell region journal October 2003
Microscopic study of neutron-rich dysprosium isotopes journal January 2013
Nuclear ground-state masses and deformations: FRDM(2012) journal May 2016
Nuclear decay studies of rare isotopes: Overview of decay spectroscopy at RIBF journal February 2019
Examining the stability of Sm nuclei around N = 100 journal June 2012
Masses and β -Decay Spectroscopy of Neutron-Rich Odd-Odd Eu 160 , 162 Nuclei: Evidence for a Subshell Gap with Large Deformation at N = 98 journal May 2018
Source of the Rare-Earth Element Peak in r -Process Nucleosynthesis journal September 1997
Formation of the rare-earth peak: Gaining insight into late-time r -process dynamics journal April 2012
Exotic nuclei explored at in-flight separators journal November 2017
Isomer Decay Spectroscopy of Sm 164 and Gd 166 : Midshell Collectivity Around N = 100 journal December 2014
Decay spectroscopy of 160 Sm: The lightest four-quasiparticle K isomer journal February 2016
Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172 Dy: Collectivity beyond double midshell journal September 2016
K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy journal November 2016
μ s isomers of Nd 158 , 160 journal December 2016
New K isomers in the neutron-rich N = 100 isotones Sm 162 ,   Eu 163 , and Gd 164 journal March 2017
Isomer-delayed γ -ray spectroscopy of A = 159 – 164 midshell nuclei and the variation of K -forbidden E 1 transition hindrance factors journal September 2017
Review of metastable states in heavy nuclei journal May 2016
New Physics Opportunities at Gammasphere journal January 1996
Identification and separation of radioactive isotope beams by the BigRIPS separator at the RIKEN RI Beam Factory journal December 2013
Monopole-Driven Shell Evolution below the Doubly Magic Nucleus Sn 132 Explored with the Long-Lived Isomer in Pd 126 journal July 2014
Installation and commissioning of EURICA – Euroball-RIKEN Cluster Array
  • Söderström, P. -A.; Nishimura, S.; Doornenbal, P.
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 317 https://doi.org/10.1016/j.nimb.2013.03.018
journal December 2013
β-decay half-lives of new neutron-rich isotopes 167,168Tb and levels in 167,168Dy journal June 1999
Spectroscopy of neutron-rich Dy 168 , 170 : Yrast band evolution close to the N p N n valence maximum journal March 2010
Evaluation of theoretical conversion coefficients using BrIcc
  • Kibédi, T.; Burrows, T. W.; Trzhaskovskaya, M. B.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 589, Issue 2 https://doi.org/10.1016/j.nima.2008.02.051
journal May 2008
Transition probabilities between two-quasiparticle configurations in 170, 172Yb and 182W journal September 1983
Isomers in 156Gd, 172Yb and 182W journal November 1969
Configurations and hindered decays of K isomers in deformed nuclei with A > 100 journal May 2015
Towards a better parametrisation of Skyrme-like effective forces: A critical study of the SkM force journal September 1982
A study of 172Yb following the 170Er(α, 2n) reaction journal July 1980
Collective vibrational states in even erbium nuclei journal January 1968
Collective excitation of Yb 172 from inelastic α scattering at 36 MeV journal October 1987
Multi-quasiparticle states in the mass-180 region journal August 1995
Microscopic study of the high-spin behaviour in selected A ≃ 80 nuclei journal March 1985
Coupling of Angular Momenta in Odd-Odd Nuclei journal September 1958
Decay of Tm 173 journal October 1963
A Survey of Nonrotational States of Deformed Odd- A Nuclei ( 150 < A < 190 ) journal July 1971

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS