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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 37: Nuclear Structure/Spectroscopy VI

HK 37.3: Talk

Thursday, March 11, 2004, 14:30–14:45, A

Study of the 183−190Pb by simultaneous atomic- and nuclear- spectroscopy — •Maxim Seliverstov1, Gerhard Huber1, Peter Kunz1, Andrey Andreyev2, Hilde de Witte2, Piet van Duppen2, Serge Franchoo1, Valentine Fedosseev3, Brigitte Roussiere4, Jocelyne Sauvage4, and Karen van de Vel21University of Mainz, 55099, Mainz, Germany — 2University of Leuven, 3001 Leuven, Belgium — 3ISOLDE CERN, 1211 Geneve 23, Switzerland — 4Institut de Physique Nucleaire, IN2P3-CNRS, 91406 Orsay, France

We have extended the laser spectroscopy on Pb to very neutron deficient isotopes at the mid-shell (N = 104). Now the Pb isotopic chain (more than 30 isotopes and isomers) is the longest investigated chain. The behaviour of the Z=82 magicity is of particular interest for nuclear physics.

The first accurate laser spectroscopic measurements with the laser ion source (RILIS) have been performed at on-line mass-separator ISOLDE. The nuclides were produced by spallation in an uranium-graphite target connected to the RILIS. With a special laser control system (Uni Mainz) long laser scans could be performed. This was essential for the detection of the photoions by their radioactive decay at a β-γ (IPN, Orsay) and α-γ spectroscopy set-ups (Uni Leuven). The combination of atomic and nuclear spectroscopy allowed to identify the resonances from ground- and isomeric- states.

The new results for Pb isotopes will be compared to the corresponding data for the lighter Hg and Pt isotones.

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