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Title: K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy

Here, a detailed study of the structure of the doubly mid-shell nucleus 170 66Dy 104 has been carried out, following isomeric and β decay. We have measured the yrast band up to the spin-parity J π = 6 + state, the K = 2 γ -vibration band up to the 5 + state, a low-lying negative-parity band based on a 2¯ state that could be a candidate for the lowest energy octupole vibration state within this nucleus, and a candidate for the K π = 6+ two quasi-particle isomer. This state was determined to have an excitation energy of 1643.91(23) keV and a half life of 0.99(4) μs, with a reduced hindrance for its decay to the groundstate band an order of magnitude lower than predicted by N pN n systematics. This is interpreted as being due to γ -vibrational mixing from a near degeneracy of the isomer and the 6 + state of the γ band. Furthermore, the parent nucleus 170Tb has been determined to have a half-life of 0.91( +18 –13) s with a possible spin-parity of 2¯.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [1] ;  [12] ;  [13] ;  [14] ;  [15] ;  [6] ;  [1] ;  [16] ;  [1] more »;  [17] ;  [17] ;  [2] ;  [18] ;  [8] ;  [19] ;  [1] ;  [19] ;  [20] ;  [1] ;  [1] ;  [15] ;  [15] ;  [21] ;  [22] ;  [1] ;  [1] ;  [21] ;  [8] ;  [2] ;  [23] ;  [18] ;  [24] ;  [2] ;  [25] ;  [13] ;  [26] ;  [15] ;  [2] ;  [2] ;  [27] ;  [28] ;  [21] ;  [2] ;  [1] ;  [1] ;  [6] ;  [8] ;  [29] ;  [10] « less
  1. RIKEN Nishina Center, Saitama (Japan)
  2. Univ. of Surrey, Guildford (United Kingdom)
  3. RIKEN Nishina Center, Saitama (Japan); Peking Univ., Beijing (China)
  4. Xi'an Jiaotong Univ., Xi'an (China)
  5. Univ. of Surrey, Guildford (United Kingdom); National Physical Lab., Middlesex (United Kingdom)
  6. Beihang Univ., Beijing (China)
  7. Riken Nishina Center, Saitama (Japan)
  8. Hungarian Academy of Sciences, Debrecen (Hungary)
  9. Chung-Ang Univ., Seoul (Republic of Korea)
  10. The Univ. of Hong Kong (Hong Kong)
  11. RIKEN Nishina Center, Saitama (Japan); National Physical Lab., Middlesex (United Kingdom)
  12. RIKEN Nishina Center, Saitama (Japan); VNU Hanoi Univ. of Science, Hanoi (Viet Nam)
  13. Tohoku Univ., Sendai (Japan)
  14. Peking Univ., Beijing (China)
  15. Osaka Univ., Toyonaka (Japan)
  16. Almajmaah Univ. (Saudi Arabia)
  17. Univ. of Brighton, Brighton (United Kingdom)
  18. Sungkyunkwan Univ., Suwon (Republic of Korea)
  19. Univ. of Edinburgh, Edinburgh (United Kingdom)
  20. Osaka Univ., Toyonaka (Japan); Osaka Univ., Osaka (Japan)
  21. GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany)
  22. Argonne National Lab. (ANL), Argonne, IL (United States)
  23. Australian National Univ., Canberra, ACT (Australia)
  24. Chung-Ang Univ., Seoul (Korea, Republic of)
  25. Hoseo Univ., Chungnam (Republic of Korea)
  26. Univ. of Brighton, Brighton (United Kingdom); Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), Bucharest (Romania)
  27. Univ. College Dublin, Dublin (Ireland)
  28. RIKEN Nishina Center, Saitama (Japan); Univ. of Tokyo, Tokyo (Japan)
  29. Istituto Nazionale di Fisica Nucleare, Legnaro (Italy)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 762; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
National Research Foundation of Korea (NRF); Japan Society for the Promotion of Science (JSPS) - KAKENHI; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Dysprosium; K isomer; mid-shell; γ -Ray spectroscopy
OSTI Identifier:
1328253
Alternate Identifier(s):
OSTI ID: 1333313