Shell gap reduction in neutron-rich N=17 nuclei

A. Obertelli (1) , A. Gillibert (1) , N. Alamanos (1) , M. Alvarez (1) , F. Auger (1) , R. Dayras (1) , A. Drouart (1) , G. de France (2) , B. Jurado (2, 3) , N. Keeley (1) , V. Lapoux (1) , W. Mittig (2) , X. Mougeot (1) , L. Nalpas (1) , A. Pakou , N. Patronis , E.C. Pollacco (1) , F. Rejmund (2) , M. Rejmund (2) , P. Roussel-Chomaz (2) , H. Savajols (2) , F. Skaza (1) , Ch. Theisen (1)

1 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
2 GANIL - Grand Accélérateur National d'Ions Lourds
3 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan

The spectroscopy of $^{27}$Ne has been investigated through the one-neutron transfer reaction $^{26}$Ne(d,p)$^{27}$Ne in inverse kinematics at 9.7 MeV/nucleon. The results strongly support the existence of a low-lying negative parity state in $^{27}$Ne, which is a signature of a reduced sd–fp shell gap in the N=16 neutron-rich region, at variance with stable nuclei.

Mots clés: Transfer reactions; 26Ne(d; p)27Ne; 27Ne spectroscopy

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

A. Obertelli, A. Gillibert, N. Alamanos, M. Alvarez, F. Auger, et al.. Shell gap reduction in neutron-rich N=17 nuclei. Physics Letters B, 2006, 633, pp.33-37. ⟨10.1016/j.physletb.2005.11.033⟩. ⟨in2p3-00025623⟩