Strong Neutron Pairing in core+4n Nuclei

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The emission of neutron pairs from the neutron-rich N=12 isotones C18 and O20 has been studied by high-energy nucleon knockout from N19 and O21 secondary beams, populating unbound states of the two isotones up to 15 MeV above their two-neutron emission thresholds. The analysis of triple fragment-n-n correlations shows that the decay N19(-1p)C18∗→C16+n+n is clearly dominated by direct pair emission. The two-neutron correlation strength, the largest ever observed, suggests the predominance of a C14 core surrounded by four valence neutrons arranged in strongly correlated pairs. On the other hand, a significant competition of a sequential branch is found in the decay O21(-1n)O20∗→O18+n+n, attributed to its formation through the knockout of a deeply bound neutron that breaks the O16 core and reduces the number of pairs.


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  • F. M. Marqués
  • O. Sorlin
  • T. Aumann
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  • M. Vandebrouck
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  • P. Díaz Fernández
  • I. Dillmann
  • Z. Elekes
  • J. Enders
  • O. Ershova
  • A. Estradé
  • F. Farinon
  • L. M. Fraile
  • M. Freer
  • D. Galaviz
  • H. Geissel
  • R. Gernhäuser
  • P. Golubev
  • K. Göbel
  • J. Hagdahl
  • T. Heftrich
  • M. Heil
  • M. Heine
  • A. Heinz
  • A. Henriques
  • A. Knyazev
  • R3B Collaboration
Enheter & grupper
Externa organisationer
  • University of Paris-Saclay
  • Michigan State University
  • Texas A and M University
  • University of Vigo
  • Saha Institute of Nuclear Physics
  • Justus Liebig University Giessen
  • Hungarian Academy of Sciences
  • Complutense University of Madrid
  • University of Caen Normandy
  • Technical University of Darmstadt
  • GSI Helmholtz Centre for Heavy Ion Research
  • Helmholtz-Zentrum Dresden-Rossendorf
  • CSIC Instituto de Estructura de la Materia (IEM)
  • University of Surrey
  • Russian Research Center 'Kurchatov Institute'
  • University of Edinburgh
  • University of Birmingham
  • Laboratory of Instrumentation and Experimental Particles Physics
  • Technical University of Munich
  • Goethe University
  • Chalmers Tekniska Högskola

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik
TidskriftPhysical Review Letters
Utgåva nummer15
StatusPublished - 2018 apr 12
Peer review utfördJa