@article{4d855ae6d5f44840a24e342e874457cb,
title = "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.",
author = "{R³B collaboration} and A. Revel and Marqu{\'e}s, {F. M.} and O. Sorlin and T. Aumann and C. Caesar and M. Holl and V. Panin and M. Vandebrouck and F. Wamers and H. Alvarez-Pol and L. Atar and V. Avdeichikov and S. Beceiro-Novo and D. Bemmerer and J. Benlliure and Bertulani, {C. A.} and Boillos, {J. M.} and K. Boretzky and Borge, {M. J.G.} and M. Caama{\~n}o and E. Casarejos and Catford, {W. N.} and J. Cederk{\"a}ll and M. Chartier and L. Chulkov and D. Cortina-Gil and E. Cravo and R. Crespo and {Datta Pramanik}, U. and {D{\'i}az Fern{\'a}ndez}, P. and I. Dillmann and Z. Elekes and J. Enders and O. Ershova and A. Estrad{\'e} and F. Farinon and Fraile, {L. M.} and M. Freer and D. Galaviz and H. Geissel and R. Gernh{\"a}user and P. Golubev and K. G{\"o}bel and J. Hagdahl and T. Heftrich and M. Heil and M. Heine and A. Heinz and A. Henriques and J. Machado",
year = "2018",
month = apr,
day = "12",
doi = "10.1103/PhysRevLett.120.152504",
language = "English",
volume = "120",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "15",
}