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Joakim

Joakim Cederkäll

Professor

Joakim

Strong Neutron Pairing in core+4n Nuclei

Author

  • A. Revel
  • F. M. Marqués
  • O. Sorlin
  • T. Aumann
  • C. Caesar
  • M. Holl
  • V. Panin
  • M. Vandebrouck
  • F. Wamers
  • H. Alvarez-Pol
  • L. Atar
  • V. Avdeichikov
  • S. Beceiro-Novo
  • D. Bemmerer
  • J. Benlliure
  • C. A. Bertulani
  • J. M. Boillos
  • K. Boretzky
  • M. J.G. Borge
  • M. Caamaño
  • E. Casarejos
  • W. N. Catford
  • J. Cederkäll
  • M. Chartier
  • L. Chulkov
  • D. Cortina-Gil
  • E. Cravo
  • R. Crespo
  • U. Datta Pramanik
  • 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

Summary, in English

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.

Department/s

  • Department of Physics

Publishing year

2018-04-12

Language

English

Publication/Series

Physical Review Letters

Volume

120

Issue

15

Document type

Journal article

Publisher

American Physical Society

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0031-9007