Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Struktur und Dynamik von Kernen
HK 13.9: Vortrag
Montag, 19. März 2012, 18:45–19:00, P 4
Search for pygmy resonances in proton-rich Argon isotopes — •Olga Lepyoshkina1,2 and Christoph Langer2,3 — 1Physik Department TU München, Garching, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 3IKP Institut für Kernphysik, Universität Frankfurt am Main, Germany
Since the discovery of pygmy resonances in neutron-rich nuclei a particular attention was paid to their analogues in proton-rich nuclei. Conceptually, RQRPA calculations predict the appearance of dipole strength for proton-rich nuclei like 32Ar in the low-energy region between 8-10 MeV excitation energy. However a significant drop of resonance strength is expected for the 34Ar. In contrast to the neutron-rich nuclei for which the existence of the pygmy resonances was justified by both theory and experiment, the proton-rich nuclei study is lacking a clear experimental confirmation yet. Aiming on the observation of the proton pygmy resonances, we have performed an experiment with a production of radioactive isotopes 32Ar and 34Ar via fragmentation of a 800 AMeV primary 36Ar beam on a beryllium target. The produced proton-rich isotopes are subsequently sent onto a lead target of the LAND-R3B setup. The dipole response is observed using the Coulomb excitation method in inverse and complete kinematics. Current status of the data analysis and preliminary results will be presented.
This work was supported by GSI F&E and BMBF.