Strong Neutron Pairing in core+4n Nuclei

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

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.

Detaljer

Författare
  • 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
  • R3B Collaboration
Enheter & grupper
Externa organisationer
  • CEA/DSM-CNRS/IN2P3
  • 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
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik
Originalspråkengelska
Artikelnummer152504
TidskriftPhysical Review Letters
Volym120
Utgåva nummer15
StatusPublished - 2018 apr 12
PublikationskategoriForskning
Peer review utfördJa