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Title: 94 β -Decay Half-Lives of Neutron-Rich Cs 55 to Ho 67 : Experimental Feedback and Evaluation of the r -Process Rare-Earth Peak Formation

Journal Article · · Physical Review Letters
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  1. Peking Univ., Beijing (China). School of Physics, State Key Lab. of Nuclear Physics; RIKEN, Saitama (Japan). Nishina Center
  2. RIKEN, Saitama (Japan). Nishina Center
  3. RIKEN, Saitama (Japan). Nishina Center; National Physical Lab. (NPL), Teddington, Middlesex (United Kingdom); Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Osaka Univ. (Japan). Research Center for Nuclear Physics (RCNP)
  6. National Physical Lab. (NPL), Teddington, Middlesex (United Kingdom); Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics
  7. Univ. Joseph Fourier Grenoble (France). Inst. National Polytechnique de Grenoble, Lab. de Physique Subatomique & Cosmologie (LPSC); Univ. of the West of Scotland, Paisley (United Kingdom). School of Engineering; Univ. of Glasgow, Scotland (United Kingdom)
  8. Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics
  9. Beihang Univ., Beijing (China). School of Physics and Nuclear Energy Engineering; RIKEN, Saitama (Japan). Nishina Center
  10. Univ. of Hong Kong (China). Dept. of Physics; Univ. of Tokyo (Japan). Dept. of Physics
  11. Univ. of Brighton (United Kingdom). School of Computing, Engineering and Mathematics; RIKEN, Saitama (Japan). Nishina Center
  12. Osaka Univ. (Japan). Dept. of Physics
  13. Univ. Joseph Fourier Grenoble (France). Inst. National Polytechnique de Grenoble, Lab. de Physique Subatomique & Cosmologie (LPSC); Inst. Laue-Langevin (ILL), Grenoble (France); RIKEN, Saitama (Japan). Nishina Center
  14. Chung-Ang Univ., Seoul (Korea, Republic of). Dept. of Physics
  15. Univ. of Hong Kong (China). Dept. of Physics
  16. Peking Univ., Beijing (China). School of Physics, State Key Lab. of Nuclear Physics
  17. Hungarian Academy of Sciences, Debrecen (Hungary). Inst. for Nuclear Research
  18. Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics; RIKEN, Saitama (Japan). Nishina Center
  19. Vietnam National Univ., Hanoi (Vietnam). Hanoi Univ. of Science, Faculty of Physics; RIKEN, Saitama (Japan). Nishina Center
  20. RIKEN, Saitama (Japan). Nishina Center; Univ. of Tokyo (Japan). Dept. of Physics
  21. Univ. of York (United Kingdom). Dept. of Physics; RIKEN, Saitama (Japan). Nishina Center
  22. Univ. of Tokyo, Wako-shi (Japan). Center for Nuclear Study (CNS)
  23. Beihang Univ., Beijing (China). School of Physics and Nuclear Energy Engineering
  24. Almajmaah Univ. (Saudi Arabia). College of Science in Zulfi, Dept. of Physics
  25. Univ. of Oslo (Norway)
  26. Istituto Nazionale di Fisica Nucleare (INFN), Milano (Italy)
  27. Univ. of Brighton (United Kingdom). School of Computing, Engineering and Mathematics
  28. Sungkyunkwan Univ., Suwon (Republic of Korea). Dept. of Physics
  29. Univ. of Edinburgh, Scotland (United Kingdom). School of Physics and Astronomy
  30. Univ. degli Studi di Padova (Italy). Dipartimento di Fisica; National Inst. of Nuclear Physics (INFN), Legnaro (Italy). National Lab. of Legnaro (INFN-LNL)
  31. GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  32. Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division
  33. Australian National Univ., Canberra, ACT (Australia). Research School of Physical Sciences and Engineering, Dept. of Nuclear Physics
  34. Hoseo Univ., Asan (Korea)
  35. Tohoku Univ., Sendai (Japan). Dept. of Physics
  36. Univ. of Brighton (United Kingdom). School of Computing, Engineering and Mathematics; Horia Hulubei National Inst. of Physics and Nuclear Engineering, Bucharest (Romania)
  37. Univ. College Dublin (Ireland). School of Physics
  38. Univ. Autonoma de Madrid (Spain). Dept. de Fisica Teorica; Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain). Inst. de Estructura de la Materia
+ Show Author Affiliations

The β-decay half-lives of 94 neutron-rich nuclei 144 $$-$$ 151Cs, 146 $$-$$ 154Ba, 148 $$-$$ 156La, 150 $$-$$ 158Ce, 153 $$-$$160Pr, 156 $$-$$ 162 Nd, 159 $$-$$ 163Pm, 160 $$-$$ 166Sm, 161 $$-$$ 168Eu , 165 $$-$$ 170Gd, 166 $$-$$ 172Tb, 169 $$-$$ 173Dy, 172 $$-$$ 175Ho, and two isomeric states 174 mEr, 172 mDy were measured at the Radioactive Isotope Beam Factory, providing a new experimental basis to test theoretical models. Strikingly large drops of β -decay half-lives are observed at neutron-number N = 97 for 58Ce, 59Pr, 60Nd , and 62Sm, and N = 105 for 63Eu, 64Gd, 65Tb, and 66Dy. Features in the data mirror the interplay between pairing effects and microscopic structure. In conclusion, $$r$$-process network calculations performed for a range of mass models and astrophysical conditions show that the 57 half-lives measured for the first time play an important role in shaping the abundance pattern of rare-earth elements in the solar system.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP); National Research Foundation of Korea (NRF); Ministry of Education, Science, and Technology (MEST) of Korea; UK Science and Technology Facilities Council
Grant/Contract Number:
AC52-06NA25396; AC02-06CH11357; K100835; NNX10AH78G; NRF-2013R1A1A2063017; NRF-2016 R1A5A1013277; NRF-2015R1D1A1A01056918; NRF-2009-0093817; 25247045; FPA2009-13377-C02; FPA2011-29854-C04; DEAC52-06NA25396
OSTI ID:
1351228
Alternate ID(s):
OSTI ID: 1344138
Report Number(s):
LA-UR-16-27574; PRLTAO; TRN: US1700710
Journal Information:
Physical Review Letters, Vol. 118, Issue 7; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 58 works
Citation information provided by
Web of Science

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Cited By (5)

r -process nucleosynthesis: connecting rare-isotope beam facilities with the cosmos journal July 2019
β -decay properties of neutron-rich Ca, Ti, and Cr isotopes journal August 2018
2018 update of the discoveries of nuclides journal February 2019
Precision mass measurements on neutron-rich rare-earth isotopes at JYFLTRAP - reduced neutron pairing and implications for the $r$-process calculations text January 2018
Exploring the mass surface near the rare-earth abundance peak via precision mass measurements at JYFLTRAP text January 2019

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