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.
|Number of pages||7|
|Journal||Physics Letters B|
|Early online date||11 Nov 2020|
|Publication status||Published - 10 Dec 2020|
Bibliographical noteFunding 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 .
© 2020 The Authors
ASJC Scopus subject areas
- Nuclear and High Energy Physics