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Intruder configurations in 29Ne at the transition into the island of inversion: Detailed structure study of 28Ne

Journal Article · · Physics Letters. B
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  1. Inst. of Physical and Chemical Research (RIKEN), Wako (Japan)
  2. Tokyo Institute of Technology (Japan)
  3. Tokyo Institute of Technology (Japan); Univ. of Surrey, Guildford (United Kingdom)
  4. Kyushu Univ., Fukuoka (Japan); Osaka Univ. (Japan)
  5. Univ. of Tokyo (Japan); RIKEN, Saitama (Japan)
  6. Univ. Autonoma de Madrid (Spain)
  7. Univ. of Tsukuba (Japan)
  8. Japan Atomic Energy Agency (JAEA), Tokai (Japan)
  9. Normandie Université (France); Centre National de la Recherche Scientifique (CNRS) (France)
  10. Lebanese University, Beirut (Lebanon)
  11. Technische Univ. Darmstadt (Germany)
  12. Technische Univ. Darmstadt (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  13. RIKEN, Saitama (Japan)
  14. GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  15. Univ. Paris-Saclay, Gif-sur-Yvette (France); Alternative Energies and Atomic Energy Commission (CEA) (France)
  16. Institute of Basic Science (IBS), Daejeon (Korea, Republic of)
  17. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  18. MTA Atomki, Debrecen (Hungary)
  19. Univ. of Groningen (Netherlands)
  20. Ruđer Bošković Institute (Croatia); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  21. Argonne National Laboratory (ANL), Argonne, IL (United States)
  22. Eötvös Loránd University (Hungary)
  23. Kyushu Univ., Fukuoka (Japan)
  24. Tohoku Univ. (Japan)
  25. Univ. of Tokyo (Japan)
  26. Chalmers University of Technology, Gothenburg (Sweden)
  27. Univ. zu Koln (Germany)
  28. Michigan State Univ., East Lansing, MI (United States)
  29. Kyoto Univ. (Japan)
  30. Normandie Université (France); Centre National de la Recherche Scientifique (CNRS) (France); Grand Accelerateur National d'Ions Lourds (GANIL); Alternative Energies and Atomic Energy Commission (CEA) (France); Univ. Paris-Saclay, Gif-sur-Yvette (France)
  31. Seoul National Univ. (Korea, Republic of)
  32. Centre National de la Recherche Scientifique (CNRS) (France); Grand Accelerateur National d'Ions Lourds (GANIL); Alternative Energies and Atomic Energy Commission (CEA) (France)
  33. Institute of Basic Science (IBS), Daejeon (Korea, Republic of); RIKEN, Saitama (Japan)
  34. Osaka Univ. (Japan)
+ Show Author Affiliations
Detailed γ-ray spectroscopy of the exotic neon isotope 28Ne has been performed for the first time using the one-neutron removal reaction from 29Ne on a liquid hydrogen target at 240 MeV/nucleon. Based on an analysis of parallel momentum distributions, a level scheme with spin-parity assignments has been constructed for 28Ne and the negative-parity states are identified for the first time. The measured partial cross sections and momentum distributions reveal a significant intruder p-wave strength providing evidence of the breakdown of the N=20 and N=28 shell gaps. Only a weak, possible f-wave strength was observed to bound final states. Large-scale shell-model calculations with different effective interactions do not reproduce the large p-wave and small f-wave strength observed experimentally, indicating an ongoing challenge for a complete theoretical description of the transition into the island of inversion along the Ne isotopic chain.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357
OSTI ID:
2282059
Alternate ID(s):
OSTI ID: 2404862
Journal Information:
Physics Letters. B, Journal Name: Physics Letters. B Vol. 843; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
in-beam γ-ray spectroscopy
island of inversion
shell evolution