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 (C15,17,19) will be discussed. In addition, one-neutron knockout measurements from N22 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 O23 and F24. The possibility of an anomalous structure of F26, 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 (Ne24-28) was studied, providing new information in a region that is relatively close to the island of inversion. © 2010 The American Physical Society.

Supported by: GSI, via Hochschulzusammenarbeitsvereinbarungen under contracts DA RICK, OF ELZ, MZ KRAK; German BMBF; the DFG cluster of excellence Origin and Structure of the Universe; FBR under Contract No. 08-02-012244; EC under Contract No. ERBCHGE-CT92-003. The Swedish Research Council and the Knut Alice Wallenberg Foundation; Ministerio de Ciencia e Innovación under Project Nos. FPA2007-62681 and FPA2007-62170; Ministerio de Educación under Grant No. FPU-AP2005-3308 and the Galician Consellería de Educación e Ordenación Universitaria, Grupos de Referencia Competitiva 2006/46.

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