Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 67: Poster Session
HK 67.41: Poster
Thursday, March 19, 2009, 14:00–16:00, Audi-Max
Collective dipole response of proton-rich nuclei 32Ar and 34Ar. — •Olga Lepyoshkina1 and Christoph Langer2 — 1Physik Department TU München, Garching — 2Institut für Kernphysik, Universität Frankfurt, Frankfurt am Main, Germany
The earlier observation of low-lying dipole strength in neutron rich nuclei and its interpretation with respect to basic nuclear properties (symmetry energy, skin thickness) initiated the investigation of this phenomenon in proton-rich nuclei. Macroscopically this strength could be explained with the resonant dipole oscillation of a proton skin against the isospin-symmetric core. For nuclei like 32Ar the occurrence of pronounced dipole strength is predicted in the low-energy region between 8-10 MeV excitation energy. For the 34Ar the pygmy strength is expected to drop sharply and vanish entirely for the N=Z nucleus 36Ar.
The experiment S327 has been performed in August 2008 at the GSI Darmstadt in Cave C using the LAND reaction setup. Fragmentation of a 800 A MeV primary 36Ar beam on a Be target was used to produce the radioactive isotopes 34Ar and 32Ar. After passing the FRS (Fragment Separator) the ions impinged on a Pb target. The dipole response is observed using the Coulomb excitation method in inverse kinematics. The concept and the experimental method will be shown in the context of the underlying physics case in 32,34Ar.
This work was supported by GSI F&E and BMBF.