One-neutron knockout from light neutron-rich nuclei at relativistic energies

C. Rodríguez-Tajes , H. Álvarez-Pol , T. Aumann , E. Benjamim , J. Benlliure , M. J. G. Borge , M. Caamaño , E. Casarejos , A. Chatillon , D. Cortina-Gil , K. Eppinger , T. Faestermann , M. Gascón , H. Geissel , R. Gernhäuser , B. Jonson , R. Kanungo , R. Krücken , T. Kurtukian Nieto (1) , K. Larsson , P. Maierbeck , T. Nilsson , C. Nociforo , C. Pascual-Izarra , A. Perea , D. Pérez-Loureiro , A. Prochazka , S. Schwertel , H. Simon , K. Sümmerer , O. Tengblad , H. Weick , M. Winkler , M. Zhukov

1 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan

One-neutron knockout reactions from neutron-rich nuclei, with Z=6-13 and N=8-22, were studied at the Fragment Separator (GSI) at high beam energies, around 700 MeV/nucleon. Structural phenomena such as the formation of one-neutron halos in odd-mass carbon isotopes (15,17,19C) will be discussed. In addition, one-neutron knockout measurements from 22N were carried out for the first time and demonstrate clearly the change from a 0d5/2 to a 1s1/2 orbital for the valence neutron, an effect that is expected above N=14 and that was also observed in 23O and 24F. The possibility of an anomalous structure of 26F, due to a significant 1s1/2 neutron admixture, will also be discussed in the light of the experimental data obtained in this work. Finally, the ground-state configuration of neutron-rich neon isotopes (24-28Ne) was studied, providing new information in a region that is relatively close to the island of inversion.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

C. Rodríguez-Tajes, H. Álvarez-Pol, T. Aumann, E. Benjamim, J. Benlliure, et al.. One-neutron knockout from light neutron-rich nuclei at relativistic energies. Physical Review C, 2010, 82, pp.024305. ⟨10.1103/PhysRevC.82.024305⟩. ⟨in2p3-00553698⟩