Abstract
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.1 MoreReceived 18 April 2010Corrected 30 August 2010DOI:https://doi.org/10.1103/PhysRevC.82.024305©2010 American Physical Society
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