Low-lying single-particle structure of 17C and the N = 14 sub-shell closure

X. Pereira-lópez, B. Fernández-domínguez, F. Delaunay, N.l. Achouri, N.a. Orr, W.n. Catford, M. Assié, S. Bailey, B. Bastin, Y. Blumenfeld, R. Borcea, M. Caamaño, L. Caceres, E. Clément, A. Corsi, N. Curtis, Q. Deshayes, F. Farget, M. Fisichella, G. De FranceS. Franchoo, M. Freer, J. Gibelin, A. Gillibert, G.f. Grinyer, F. Hammache, O. Kamalou, A. Knapton, T. Kokalova, V. Lapoux, J.a. Lay, B. Le Crom, S. Leblond, J. Lois-fuentes, F.m. Marqués, A. Matta, P. Morfouace, A.m. Moro, T. Otsuka, J. Pancin, L. Perrot, J. Piot, E. Pollacco, D. Ramos, C. Rodríguez-tajes, T. Roger, F. Rotaru, M. Sénoville, N. De Séréville, R. Smith, O. Sorlin, M. Stanoiu, I. Stefan, C. Stodel, D. Suzuki, T. Suzuki, J.c. Thomas, N. Timofeyuk, M. Vandebrouck, J. Walshe, C. Wheldon

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The first investigation of the single-particle structure of the bound states of 17C, via the d(16C,p) transfer reaction, has been undertaken. The measured angular distributions confirm the spin-parity assignments of 1/2+ and 5/2+ for the excited states located at 217 and 335 keV, respectively. The spectroscopic factors deduced for these states exhibit a marked single-particle character, in agreement with shell model and particle-core model calculations, and combined with their near degeneracy in energy provide clear evidence for the absence of the N=14 sub-shell closure. The very small spectroscopic factor found for the 3/2+ ground state is consistent with theoretical predictions and indicates that the ν1d3/2 strength is carried by unbound states. With a dominant ℓ=0 valence neutron configuration and a very low separation energy, the 1/2+ excited state is a one-neutron halo candidate.

Original languageEnglish
Article number135939
Number of pages7
JournalPhysics Letters B
Early online date11 Nov 2020
Publication statusPublished - 10 Dec 2020

Bibliographical note

Funding Information:
X.P.L. wishes to acknowledge the financial support of an IN2P3/CNRS (France) doctoral fellowship, from the National Nuclear Security Administration under the Stewardship Science Academic Alliance program through DOE Cooperative Agreement No. DE-NA0002132 and from the UKRI Science and Technology Facilities Council grant ST/P003885 . B.F.D. and M.C.F. acknowledge financial support from the Ramón y Cajal programme RYC-2010-06484 and RYC-2012-11585 and from the Spanish MINECO grant No. FPA2013-46236-P . This work is partly supported by MINECO (Spain) grant 2011-AIC-D-2011-0802 and PGC2018-096717-B-C22 and by the Xunta de Galicia through the grant EM2013/039 . W.N.C. and A.M. acknowledge financial support from the STFC grant number ST/L005743/1 . A. Moro and J.A. Lay acknowledge the Spanish Ministerio de Ciencia, Innovación y Universidades and FEDER funds under project FIS2017-88410-P and RTI2018-098117-B-C21 and the European Union's Horizon 2020 research and innovation program under Grant Agreement No. 654002 . The authors acknowledge the support provided by the technical staff of LPC-Caen and GANIL. The participants from the Universities of Birmingham and Surrey, as well as the INFN and IFIN-HH laboratories also acknowledge partial support from the European Community within the FP6 contract EURONS RII3-CT-2004-06065 .

Publisher Copyright:
© 2020 The Authors

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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