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HK: Fachverband Hadronen und Kerne

HK 6: Nuclear Structure and Dynamics I

HK 6.2: Invited Group Report

Monday, March 16, 2009, 14:30–15:00, H-ZO 40

Recent results on knockout reactions at relativistic energies in the psd shell — •Dolores Cortina-Gil — Universidad Santiago de Compostela

Large isospin variations in exotic nuclei are predicted to modify the nuclear mean-field picture together with the long and short-range correlations. The role of certain residual interactions becomes enhanced with proton-neutron asymmetry, in particular the monopole interaction that acts between proton-neutron spin-orbit partners. The combination of all these effects is at the origin of the observed change in traditional magic numbers. Recent studies of light neutron-rich isotopes near the neutron dripline have shown very exciting issues suggesting the collapse of the N=20 shell closure in favour of the appearance of new magic numbers at N=14,16. The study of nuclear structure in the vicinity of these new magic numbers represents a key issue for the understanding of the evolution of the shell structure with isospin.

Direct reactions are currently used to explore nuclear structure. These reactions, exciting a minimal number of degrees of freedom, are very precise probes of single-particle motion. Among them, the reaction channel involving the removal of a single nucleon, known as one-neutron nuclear knockout, is favoured because of its relatively high cross-section. Using the FRS at GSI, we have studied this reaction channel in several experiments to elucidate the wave function of exotic nuclei.

We will present in this talk few selected experimental examples corresponding to nuclear knockout of Z=6-13 n-rich exotic projectiles.