Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 33: Kernphysik/Spektroskopie

HK 33.2: Gruppenbericht

Dienstag, 8. März 2005, 17:00–17:30, TU MA041

Investigation of nuclear matter distribution of the neutron-rich He isotopes by proton elastic scattering at intermediate energies — •Oleg Kiselev — Institut für Kernchemie, Johannes Gutenberg Universität Mainz, D-55128 Mainz

The study of neutron-rich light nuclei near the drip line has attracted much attention as they exhibit an extended distribution (so-called halo) of the valence neutrons surrounding a compact core. Elastic proton scattering at intermediate energies is known as a very successful technique for exploring the nuclear matter distributions in the stable and also in the exotic nuclei. In order to supplement data taken for small-angle scattering, differential cross-sections for higher momentum transfer were measured at energies near 700 MeV/u for the neutron-rich helium isotopes ^6,8He using a liquid hydrogen target. The differential cross sections obtained in both experiments have been evaluated using several phenomenological parameterizations for the nuclear matter distribution within the Glauber multiple scattering theory. In addition, a model-independent analysis with the help of a Sum-Of-Gaussians method has been performed, which is a standard method for the investigation of nuclear charge distributions from electron scattering data. The results on the nuclear sizes and the radial structure of the total nuclear matter, core and halo density distributions in ⁶He and ⁸He will be presented. The measured differential cross sections have been also used for probing density distributions as predicted by various theoretical calculations. The comparison of the data with the latest calculations will be shown.