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

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Authors

  • X. Pereira-lópez
  • B. Fernández-domínguez
  • F. Delaunay
  • N.l. Achouri
  • N.a. Orr
  • W.n. Catford
  • M. Assié
  • B. Bastin
  • Y. Blumenfeld
  • R. Borcea
  • M. Caamaño
  • L. Caceres
  • E. Clément
  • A. Corsi
  • Q. Deshayes
  • F. Farget
  • M. Fisichella
  • G. De France
  • S. Franchoo
  • J. Gibelin
  • A. Gillibert
  • G.f. Grinyer
  • F. Hammache
  • O. Kamalou
  • A. Knapton
  • 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
  • O. Sorlin
  • M. Stanoiu
  • I. Stefan
  • C. Stodel
  • D. Suzuki
  • T. Suzuki
  • J.c. Thomas
  • N. Timofeyuk
  • M. Vandebrouck
  • J. Walshe
  • Carl Wheldon

Colleges, School and Institutes

Abstract

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.

Bibliographic 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

Details

Original languageEnglish
Article number135939
Number of pages7
JournalPhysics Letters B
Volume811
Early online date11 Nov 2020
Publication statusPublished - 10 Dec 2020

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