Strong Neutron Pairing in core +4n Nuclei

R3B collaboration; Martin Freer; Carl Wheldon

doi:10.1103/PhysRevLett.120.152504

Strong Neutron Pairing in core +4n Nuclei

R3B collaboration, Martin Freer, Carl Wheldon

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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.

Original language	English
Article number	152504
Journal	Physical Review Letters
Volume	120
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.120.152504
Publication status	Published - 12 Apr 2018

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.120.152504Licence: None: All rights reserved

Revel_et_al_Strong_neutron_pairing_Physical_Review_Letters_2018
Published in Physical Review Letters on 12/04/2018 Strong Neutron Pairing in Core +4n Nuclei, Revel et al, PhysRevLett.120.152504, DOI: 10.1103/PhysRevLett.120.152504
Accepted author manuscript, 403 KBLicence: None: All rights reserved

Cite this

@article{792358caebb345cc8c1a886ed72ac30f,

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 Martin 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 Carl Wheldon",

year = "2018",

month = apr,

day = "12",

doi = "10.1103/PhysRevLett.120.152504",

language = "English",

volume = "120",

journal = "Physical Review Letters",

issn = "0031-9007",

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T1 - Strong Neutron Pairing in core +4n Nuclei

AU - R3B collaboration

AU - Revel, A.

AU - Marqués, F. M.

AU - Sorlin, O.

AU - Aumann, T.

AU - Caesar, C.

AU - Holl, M.

AU - Panin, V.

AU - Vandebrouck, M.

AU - Wamers, F.

AU - Alvarez-Pol, H.

AU - Atar, L.

AU - Avdeichikov, V.

AU - Beceiro-Novo, S.

AU - Bemmerer, D.

AU - Benlliure, J.

AU - Bertulani, C. A.

AU - Boillos, J. M.

AU - Boretzky, K.

AU - Borge, M. J.G.

AU - Caamaño, M.

AU - Casarejos, E.

AU - Catford, W. N.

AU - Cederkäll, J.

AU - Chartier, M.

AU - Chulkov, L.

AU - Cortina-Gil, D.

AU - Cravo, E.

AU - Crespo, R.

AU - Datta Pramanik, U.

AU - Díaz Fernández, P.

AU - Dillmann, I.

AU - Elekes, Z.

AU - Enders, J.

AU - Ershova, O.

AU - Estradé, A.

AU - Farinon, F.

AU - Fraile, L. M.

AU - Freer, Martin

AU - Galaviz, D.

AU - Geissel, H.

AU - Gernhäuser, R.

AU - Golubev, P.

AU - Göbel, K.

AU - Hagdahl, J.

AU - Heftrich, T.

AU - Heil, M.

AU - Heine, M.

AU - Heinz, A.

AU - Henriques, A.

AU - Wheldon, Carl

PY - 2018/4/12

Y1 - 2018/4/12

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85045325864&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.120.152504

DO - 10.1103/PhysRevLett.120.152504

M3 - Article

AN - SCOPUS:85045325864

SN - 0031-9007

VL - 120

JO - Physical Review Letters

JF - Physical Review Letters

IS - 15

M1 - 152504

ER -

Strong Neutron Pairing in core +4n Nuclei

Abstract

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