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

X. Pereira-López (1) , B. Fernández-Domínguez , F. Delaunay (1) , N.L. Achouri (1) , N.A. Orr (1) , W.N. Catford , M. Assie , S. Bailey , B. Bastin (2) , Y. Blumenfeld (3) , R. Borcea , M. Caamaño , L. Caceres (2) , E. Clément (2) , A. Corsi , N. Curtis , Q. Deshayes (1) , F. Farget (2) , M. Fisichella , G. de France (2) , S. Franchoo (3) , M. Freer , J. Gibelin (1) , A. Gillibert (4) , G.F. Grinyer , F. Hammache (3) , O. Kamalou (2) , A. Knapton , T. Kokalova , V. Lapoux (4) , J.A. Lay , B. Le Crom (3) , S. Leblond (1) , J. Lois-Fuentes , F.M. Marqués (1) , A. Matta , P. Morfouace (3) , A.M. Moro , T. Otsuka , J. Pancin (2) , L. Perrot (3) , J. Piot (2) , E. Pollacco , D. Ramos , C. Rodríguez-Tajes (2) , T. Roger (2) , F. Rotaru , M. Sénoville (4) , N. de Séréville (3) , R. Smith , O. Sorlin (2) , M. Stanoiu , I. Stefan (3) , C. Stodel (2) , D. Suzuki , T. Suzuki (3) , J.C. Thomas (2) , N. Timofeyuk , M. Vandebrouck (2) , J. Walshe , C. Wheldon

1 LPCC - Laboratoire de physique corpusculaire de Caen
2 GANIL - Grand Accélérateur National d'Ions Lourds
3 IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
4 DPHN - Département de Physique Nucléaire (ex SPhN)

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

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

X. Pereira-López, B. Fernández-Domínguez, F. Delaunay, N.L. Achouri, N.A. Orr, et al.. Low-lying single-particle structure of $^{17} $C and the N = 14 sub-shell closure. Physics Letters B, 2020, 811, pp.135939. ⟨10.1016/j.physletb.2020.135939⟩. ⟨hal-03049145⟩