Strong neutron pairing in core+4n nuclei

A. Revel, F. M. Marques, Olivier Sorlin, Thomas Aumann, Christoph Caesar, Matthias Holl, Valerii Panin, M. Vandebrouck, Felix Wamers, Hector Alvarez-Pol, Leyla Atar, Vladimir Avdeichikov, S. Beceiro-Novo, Daniel Bemmerer, Jose Benlliure, Carlos Bertulani, J. M. Boillos, Konstanze Boretzky, M J G Borge, Manuel CaamañoEnrique Casarejos, W.N. Catford, J. Cederkäll, Marielle Chartier, Leonid Chulkov, D. Cortina Gil, E. Cravo, Raquel Crespo, Ushasi Datta Pramanik, Paloma Diaz-Fernandez, Iris Dillmann, Zoltan Elekes, Joachim Enders, Olga Ershova, A. Estrade, F. Farinon, Luis M. Fraile, Martin Freer, Daniel Galaviz, Hans Geissel, R. Gernhauser, Pavel Golubev, Kathrin Göbel, Julius Hagdahl, T. Heftrich, Michael Heil, Marcel Heine, Andreas Heinz, Ana Henriques, Alexander Ignatov, H. T. Johansson, B Jonson, J. Kahlbow, Nasser Kalantar-Nayestanaki, Rituparna Kanungo, Aleksandra Kelic-Heil, A. Knyazev, T Kroll, Nikolaus Kurz, M. Labiche, Christoph Langer, Tudi Le Bleis, Roy Lemmon, Simon Lindberg, J. Machado, Justyna Marganiec, Alina Movsesyan, E. Nácher, M. Najafi, Thomas Nilsson, Chiara Nociforo, Stefanos Paschalis, Angel Perea, Marina Kalliopi Petri, S. Pietri, Ralf Plag, René Reifarth, Guillermo Ribeiro, Catherine Rigollet, M. Roder, Dominic M. Rossi, Deniz Savran, Heiko Scheit, Haik Simon, I. Syndikus, J. T. Taylor, O Tengblad, Ronja Thies, Yasuhiro Togano, Paulo Velho, Vasily Volkov, Andreas Wagner, Helmut Weick, Carl Wheldon, G Wilson, J S Winfield, P. Woods, Dmitry Yakorev, Mikhail Zhukov, Andreas Zilges, Kai Zuber

Research output: Contribution to journalLetterpeer-review


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.

Original languageEnglish
Article number152504
Number of pages6
JournalPhysical Review Letters
Issue number15
Publication statusPublished - 12 Apr 2018

Bibliographical note

© 2018 American Physical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

Cite this