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Title: Unveiling the two-proton halo character of 17Ne: Exclusive measurement of quasi-free proton-knockout reactions

Journal Article · · Physics Letters. B
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  1. Darmstadt University of Technology (Germany); Technische Universität Darmstadt, Department of Physics, D–64289 Darmstadt, Germany
  2. Darmstadt University of Technology (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)
  3. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)
  4. Universidade de Santiago de Compostela (Spain)
  5. Darmstadt University of Technology (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); Helmholtz Research Academy Hesse for FAIR, Darmstadt (Germany)
  6. Texas A & M University, College Station, TX (United States)
  7. Instituto de Estructura de la Materia, Madrid (Spain)
  8. University of Liverpool (United Kingdom)
  9. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); NRC Kurchatov Institute, Moscow (Russia)
  10. Universidade de Santiago de Compostela (Spain); Chalmers Tekniska Högskola, Goteborg (Sweden)
  11. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); Goethe Universität Frankfurt (Germany)
  12. Universidad Complutense de Madrid (Spain)
  13. Aarhus University (Denmark)
  14. Darmstadt University of Technology (Germany)
  15. Darmstadt University of Technology (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); Chalmers Tekniska Högskola, Goteborg (Sweden)
  16. Chalmers Tekniska Högskola, Goteborg (Sweden)
  17. Johannes Gutenberg-Universität Mainz (Germany)
  18. Uniwersytet Jagelloński, Krakov (Poland); Instytut Fizyki im. Mariana Smoluchowskiego UJ, Krakov (Poland)
  19. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); Technical University of Munich (Germany)
  20. STFC Daresbury Laboratory, Cheshire (United Kingdom)
  21. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); Darmstadt University of Technology (Germany)
  22. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); Bhabha Atomic Research Centre, Bombay (India)
  23. Goethe Universität Frankfurt (Germany)
  24. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); University of Liverpool (United Kingdom)
  25. Darmstadt University of Technology (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); Johannes Gutenberg-Universität Mainz (Germany)
  26. Goethe Universität Frankfurt (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)
+ Show Author Affiliations

The proton drip-line nucleus 17Ne is investigated experimentally in order to determine its two-proton halo character. A fully exclusive measurement of the 17Ne (p, 2p)16F*15O+p quasi-free one-proton knockout reaction has been performed at GSI at around 500 MeV/nucleon beam energy. All particles resulting from the scattering process have been detected. The relevant reconstructed quantities are the angles of the two protons scattered in quasi-elastic kinematics, the decay of 16F into 15O (including γ decays from excited states) and a proton, as well as the 15O+p relative-energy spectrum and the 16F momentum distributions. The latter two quantities allow an independent and consistent determination of the fractions of l = 0 and l = 2 motion of the valence protons in 17Ne. With a resulting relatively small l = 0 component of only around 35(3)%, it is concluded that 17Ne exhibits a rather modest halo character only. The quantitative agreement of the two values deduced from the energy spectrum and the momentum distributions supports the theoretical treatment of the calculation of momentum distributions after quasi-free knockout reactions at high energies by taking into account distortions based on the Glauber theory. Moreover, the experimental data allow the separation of valence-proton knockout and knockout from the 15O core. The latter process contributes with 11.8(3.1) mb around 40% to the total proton-knockout cross section of 30.3(2.3) mb, which explains previously reported contradicting conclusions derived from inclusive cross sections.

Research Organization:
Texas A & M University, College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC); German Federal Ministry for Education and Research (BMBF); ExtreMe Matter Institute (EMMI); Swedish Research Council; Russian Foundation for Basic Research; Spain Ministry of Science, Innovation and Universities (MICINN); National Science Foundation (NSF)
Grant/Contract Number:
FG02-08ER41533
OSTI ID:
1977564
Journal Information:
Physics Letters. B, Journal Name: Physics Letters. B Journal Issue: C Vol. 827; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (23)

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Exclusive measurements of quasi-free proton scattering reactions in inverse and complete kinematics journal February 2016
Quenching of single-particle strength from direct reactions with stable and rare-isotope beams journal May 2021
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Quasi-free scattering in inverse kinematics as a tool to unveil the structure of nuclei journal March 2021
Observation of a two-proton halo in 17Ne journal August 2005
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