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

doi:10.1103/PhysRevLett.120.152504

Strong neutron pairing in core+4n nuclei

Nuclear Experiment 2018-04-18 v1

Authors: 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

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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 $^*\!\rightarrow^{16}$ 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 $^*\!\rightarrow^{18}$ 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.

Keywords

nuclear structure nuclear physics

Cite

@article{arxiv.1803.04777,
title = {Strong neutron pairing in core+4n nuclei},
author = {A. Revel and F. M. Marques 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 C. A. Bertulani and J. M. Boillos and K. Boretzky and M. J. G. Borge and M. Caamano and E. Casarejos and W. N. Catford and J. Cederkäll and M. Chartier and L. Chulkov and D. Cortina-Gil and E. Cravo and R. Crespo and U. Datta Pramanik and P. Diaz Fernandez and I. Dillmann and Z. Elekes and J. Enders and O. Ershova and A. Estrade and F. Farinon and L. M. Fraile and M. Freer and D. Galaviz and H. Geissel and R. Gernhauser and P. Golubev and K. Göbel and J. Hagdahl and T. Heftrich and M. Heil and M. Heine and A. Heinz and A. Henriques and A. Hufnagel and A. Ignatov and H. T. Johansson and B. Jonson and J. Kahlbow and N. Kalantar-Nayestanaki and R. Kanungo and A. Kelic-Heil and A. Knyazev and T. Kroll and N. Kurz and M. Labiche and C. Langer and T. Le Bleis and R. Lemmon and S. Lindberg and J. Machado and J. Marganiec and A. Movsesyan and E. Nacher and M. Najafi and E. Nikolskii and T. Nilsson and C. Nociforo and S. Paschalis and A. Perea and M. Petri and S. Pietri and R. Plag and R. Reifarth and G. Ribeiro and C. Rigollet and M. Roder and D. Rossi and D. Savran and H. Scheit and H. Simon and I. Syndikus and J. T. Taylor and O. Tengblad and R. Thies and Y. Togano and P. Velho and V. Volkov and A. Wagner and H. Weick and C. Wheldon and G. Wilson and J. S. Winfield and P. Woods and D. Yakorev and M. Zhukov and A. Zilges and K. Zuber},
journal= {arXiv preprint arXiv:1803.04777},
year = {2018}
}

Comments

6 pages, 4 figures, accepted for publication in Phys. Rev. Lett

Strong neutron pairing in core+4n nuclei

Abstract

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