Strong neutron pairing in core+4n nuclei

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.

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Item Type:	Article
Authors/Creators:	Revel, A. Marques, F. M. Sorlin, Olivier Aumann, Thomas Caesar, Christoph Holl, Matthias Panin, Valerii Vandebrouck, M. Wamers, Felix Alvarez-Pol, Hector Atar, Leyla Avdeichikov, Vladimir Beceiro-Novo, S. Bemmerer, Daniel Benlliure, Jose Bertulani, Carlos Boillos, J. M. Boretzky, Konstanze Borge, M J G Caamaño, Manuel Casarejos, Enrique Catford, W.N. Cederkäll, J. Chartier, Marielle Chulkov, Leonid Gil, D. Cortina Cravo, E. Crespo, Raquel Datta Pramanik, Ushasi Diaz-Fernandez, Paloma Dillmann, Iris Elekes, Zoltan Enders, Joachim Ershova, Olga Estrade, A. Farinon, F. Fraile, Luis M. Freer, Martin Galaviz, Daniel Geissel, Hans Gernhauser, R. Golubev, Pavel Göbel, Kathrin Hagdahl, Julius Heftrich, T. Heil, Michael Heine, Marcel Heinz, Andreas Henriques, Ana Ignatov, Alexander Johansson, H. T. Jonson, B Kahlbow, J. Kalantar-Nayestanaki, Nasser Kanungo, Rituparna Kelic-Heil, Aleksandra Knyazev, A. Kroll, T Kurz, Nikolaus Labiche, M. Langer, Christoph Le Bleis, Tudi Lemmon, Roy Lindberg, Simon Machado, J. Marganiec, Justyna Movsesyan, Alina Nácher, E. Najafi, M. Nilsson, Thomas Nociforo, Chiara Paschalis, Stefanos https://orcid.org/0000-0002-9113-3778 Perea, Angel Petri, Marina Kalliopi https://orcid.org/0000-0002-3740-6106 Pietri, S. Plag, Ralf Reifarth, René Ribeiro, Guillermo Rigollet, Catherine Roder, M. Rossi, Dominic M. Savran, Deniz Scheit, Heiko Simon, Haik Syndikus, I. Taylor, J. T. Tengblad, O Thies, Ronja Togano, Yasuhiro Velho, Paulo Volkov, Vasily Wagner, Andreas Weick, Helmut Wheldon, Carl Wilson, G Winfield, J S Woods, P. Yakorev, Dmitry Zhukov, Mikhail Zilges, Andreas Zuber, Kai
Copyright, Publisher and Additional Information:	© 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
Dates:	Accepted: 6 March 2018 Published: 12 April 2018
Institution:	The University of York
Academic Units:	The University of York > Faculty of Sciences (York) > Physics (York)
Depositing User:	Pure (York)
Date Deposited:	19 Apr 2018 16:10
Last Modified:	17 Sep 2025 00:49
Published Version:	https://doi.org/10.1103/PhysRevLett.120.152504
Status:	Published
Refereed:	Yes
Identification Number:	10.1103/PhysRevLett.120.152504
Related URLs:	http://www.scopus.com/inward/record.url?... https://arxiv.org/abs/1803.04777 https://journals.aps.org/prl/pdf/10.1103...
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:129888

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Strong neutron pairing in core+4n nuclei

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