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Two-Neutron Halo is Unveiled in F29

Journal Article · · Physical Review Letters
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  1. Saint Mary’s Univ., Halifax, NS (Canada); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Univ. of Giessen (Germany); The University of Tennessee, Knoxville
  2. Saint Mary’s Univ., Halifax, NS (Canada); TRIUMF, Vancouver, BC (Canada)
  3. Saint Mary’s Univ., Halifax, NS (Canada); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Univ. of Giessen (Germany)
  4. GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Univ. of Giessen (Germany)
  5. RIKEN, Saitama (Japan)
  6. Hokkaido Univ., Sapporo (Japan)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  8. Nihon Univ., Tokyo (Japan)
  9. Univ. of Tokyo (Japan)
  10. GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  11. Central Michigan Univ., Mount Pleasant, MI (United States)
  12. RIKEN, Saitama (Japan); Tohoku Univ., Sendai (Japan). Dept. of Physics
  13. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  14. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  15. Saint Mary’s Univ., Halifax, NS (Canada); Dalhousie Univ., Halifax, NS (Canada)
  16. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  17. Kyoto Univ. (Japan)
  18. RIKEN, Saitama (Japan); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  19. Tokyo Institute of Technology (Japan)
  20. Osaka Univ. (Japan); Chinese Academy of Sciences (CAS), Lanzhou (China)
  21. RIKEN, Saitama (Japan); Univ. of Tokyo (Japan)
  22. Univ. of York (United Kingdom)
  23. Niigata Univ. (Japan)
  24. Univ. of Tokyo (Japan); Univ. of York (United Kingdom)
+ Show Author Affiliations
Here, we report the measurement of reaction cross sections ( σRex ) of F27,29 with a carbon target at RIKEN. The unexpectedly large σRex and derived matter radius identify F29 as the heaviest two-neutron Borromean halo to date. The halo is attributed to neutrons occupying the 2 p3/2 orbital, thereby vanishing the shell closure associated with the neutron number N=20 . The findings are explained by state-of-the-art shell model calculations. Coupled-cluster computations based on effective field theories of the strong nuclear force describe the matter radius of F27 but are challenged for F29 .
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Organization:
RIKEN Collaboration
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725; FG02-96ER40963
OSTI ID:
1632004
Alternate ID(s):
OSTI ID: 1633145
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 22 Vol. 124; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS