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19 April 2024

» arxiv » 1803.4777

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Strong neutron pairing in core+4n nuclei
A. Revel ; F.M. Marques ; 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. Caamano ; E. Casarejos ; W.N. Catford ; J. Cederkäll ; M. Chartier ; L. Chulkov ; D. Cortina-Gil ; E. Cravo ; R. Crespo ; U. Datta Pramanik ; P. Diaz Fernandez ; I. Dillmann ; Z. Elekes ; J. Enders ; O. Ershova ; A. Estrade ; F. Farinon ; L. M. Fraile ; M. Freer ; D. Galaviz ; H. Geissel ; R. Gernhauser ; P. Golubev ; K. Göbel ; J. Hagdahl ; T. Heftrich ; M. Heil ; M. Heine ; A. Heinz ; A. Henriques ; A. Hufnagel ; A. Ignatov ; H.T. Johansson ; B. Jonson ; J. Kahlbow ; N. Kalantar-Nayestanaki ; R. Kanungo ; A. Kelic-Heil ; A. Knyazev ; T. Kroll ; N. Kurz ; M. Labiche ; C. Langer ; T. Le Bleis ; R. Lemmon ; S. Lindberg ; J. Machado ; J. Marganiec ; A. Movsesyan ; E. Nacher ; M. Najafi ; E. Nikolskii ; T. Nilsson ; C. Nociforo ; S. Paschalis ; A. Perea ; M. Petri ; S. Pietri ; R. Plag ; R. Reifarth ; G. Ribeiro ; C. Rigollet ; M. Roder ; D. Rossi ; D. Savran ; H. Scheit ; H. Simon ; I. Syndikus ; J. T. Taylor ; O. Tengblad ; R. Thies ; Y. Togano ; P. Velho ; V. Volkov ; A. Wagner ; H. Weick ; C. Wheldon ; G. Wilson ; J. S. Winfield ; P. Woods ; D. Yakorev ; M. Zhukov ; A. Zilges ; K. Zuber ;
Date:	13 Mar 2018
Abstract:	The emission of neutron pairs from the neutron-rich $N!=!12$ isotones $^{18}$C and $^{20}$O has been studied by high-energy nucleon knockout from $^{19}$N and $^{21}$O 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 $^{19}$N$(-1p)^{18}$C$^! ightarrow^{16}$C+$n$+$n$ is clearly dominated by direct pair emission. The two-neutron correlation strength, the largest ever observed, suggests the predominance of a $^{14}$C 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 $^{21}$O$(-1n)^{20}$O$^! ightarrow^{18}$O+$n$+$n$, attributed to its formation through the knockout of a deeply-bound neutron that breaks the $^{16}$O core and reduces the number of pairs.
Source:	arXiv, 1803.4777
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