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

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 (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.
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Submitted on : Saturday, January 8, 2011 - 12:45:13 PM
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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, American Physical Society, 2010, 82, pp.024305. ⟨10.1103/PhysRevC.82.024305⟩. ⟨in2p3-00553698⟩



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