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Title: β-Delayed One and Two Neutron Emission Probabilities Southeast of 132Sn and the Odd-Even Systematics in r-Process Nuclide Abundances

Journal Article · · Physical Review Letters
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  1. Inst. of Physical and Chemical Research (RIKEN), Wako (Japan); Vietnam National University, Hanoi (Vietnam)
  2. Inst. of Physical and Chemical Research (RIKEN), Wako (Japan)
  3. Inst. of Physical and Chemical Research (RIKEN), Wako (Japan); National Physical Lab., Teddington (United Kingdom); Univ. of Surrey, Guildford (United Kingdom)
  4. Univ. of Edinburgh, Scotland (United Kingdom)
  5. Central Michigan Univ., Mount Pleasant, MI (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  7. Inst. of Physical and Chemical Research (RIKEN), Wako (Japan); Univ. of Hong Kong, Pokfulam (Hong Kong)
  8. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
  9. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  10. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  11. Spanish National Research Council (CSIC), Valencia (Spain); Univ. of Valencia (Spain)
  12. Inst. of Physical and Chemical Research (RIKEN), Wako (Japan); Inst. of Basic Science, Daejeon (Korea, Republic of)
  13. Inst. of Basic Science, Daejeon (Korea, Republic of)
  14. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  15. TRIUMF, Vancouver, BC (Canada)
  16. Univ. Politecnica de Catalunya (Spain)
  17. Science and Technology Facilities Council (STFC), Daresbury (United Kingdom). Daresbury Lab.
  18. TRIUMF, Vancouver, BC (Canada); Univ. of Victoria, BC (Canada)
  19. Univ. of Warsaw (Poland)
  20. Inst. of Physical and Chemical Research (RIKEN), Wako (Japan); Seoul National Univ. (Korea, Republic of)
  21. Univ. of Liverpool (United Kingdom)
  22. Univ. of Edinburgh, Scotland (United Kingdom); Horia Hulubei National Institute for Physics and Nuclear Engineering, Magurele (Romania)
  23. Vietnam Academy of Science and Technology, Hanoi (Vietnam)
  24. Inst. of Physical and Chemical Research (RIKEN), Wako (Japan); Institute for Nuclear Research (Atomki), Debrecen (Hungary)
  25. McMaster Univ., Hamilton, ON (Canada)
  26. Chinese Academy of Sciences (CAS), Lanzhou (China); University of Chinese Academy of Sciences, Beijing (China)
  27. Inst. of Physical and Chemical Research (RIKEN), Wako (Japan); Univ. of Tokyo (Japan)
  28. Univ. Politecnica de Catalunya (Spain); Spanish National Research Council (CSIC), Valencia (Spain); Univ. of Valencia (Spain)
  29. Univ. of Tennessee, Knoxville, TN (United States); Univ. of Tokyo (Japan); Inst. of Physical and Chemical Research (RIKEN), Wako (Japan)
+ Show Author Affiliations

Here, the β-delayed one- and two-neutron emission probabilities (P1n and P2n) of 20 neutron-rich nuclei with N≥82 have been measured at the RIBF facility of the RIKEN Nishina Center. P1n of 130,131Ag, 133,134Cd, 135,136In, and 138,139Sn were determined for the first time, and stringent upper limits were placed on P2n for nearly all cases. β-delayed two-neutron emission (β2n) was unambiguously identified in 133Cd and 135,136In, and their P2n were measured. Weak β2n was also detected from 137,138Sn. Our results highlight the effect of the N=82 and Z=50 shell closures on β-delayed neutron emission probability and provide stringent benchmarks for newly developed macroscopic-microscopic and self-consistent global models with the inclusion of a statistical treatment of neutron and γ emission. The impact of our measurements on r-process nucleosynthesis was studied in a neutron star merger scenario. Our P1n and P2n have a direct impact on the odd-even staggering of the final abundance, improving the agreement between calculated and observed Solar System abundances. The odd isotope fraction of Ba in r-process-enhanced (r-II) stars is also better reproduced using our new data.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Japan Society for the Promotion of Science (JSPS); Spanish Ministry of Economy, Industry and Competitiveness; Spanish Ministry of Science, Innovation and Universities; Generalitat Valenciana; Science and Technology Facilities Council (STFC) (United Kingdom); Korea Institute for Basic Science; Polish National Science Centre (NCN)
Grant/Contract Number:
AC05-00OR22725; 89233218CNA000001; FG02-96ER40983; NA0002132; 14F04808; 17H06090; 19H00693; 20H05648; 21H01087; 25247045; 19340074; PHY-1430152; PHY-1565546; PHY-1714153; FPA2014-52823-C2-1-P,; FPA2014-52823-C2-2-P; FPA2017-83946-C2-1-P; FPA2017-83946-C2-2-P; PID2019-104714GBC21; PID2019-104714GB-C22; PROMETEO/2019/007; ST/N00244X/1; ST/P004598/1; ST/V001027/1; IBS-R031-Y1; 2020/36/T/ST2/00547; 2019/33/N/ST2/03023; L1955; IBS-R031-D1
OSTI ID:
1895225
Alternate ID(s):
OSTI ID: 1893957
Journal Information:
Physical Review Letters, Vol. 129, Issue 17; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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