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HK: Fachverband Physik der Hadronen und Kerne
HK 41: Kernphysik / Spektroskopie
HK 41.4: Talk
Thursday, March 13, 2008, 17:30–17:45, 2G
Recent results from SHIP on shape coexistence and electron capture delayed fission in the Pb-Rn region* — •Andrei Andreyev — Insituut voor Kern- en Stralingfysica, Univesity of Leuven, B-3001 Leuven, Belgium — (on behalf of Leuven-Bratislava-Darmstadt-Liverpool-Vancouver-Tokai Collaboration)
The contribution reviews the results of our recent experiments at SHIP (GSI, Darmstadt) aimed at the study of very neutron-deficient Pb-Rn nuclides in the vicinity of N=104.
The first part presents the unambiguous identification of the EC-delayed fission (ECDF) in the odd-odd isotopes 192,194At. The ECDF data allow us to study the fission properties of the nuclei which do not decay via spontaneous fission at all. The preliminary analysis indicate unusually high ECDF probabilities for these nuclides.
The second part discusses the new data on the shape coexistence in the Pb region. Identification of the new isotopes 193,194Rn and first experimental evidence for the long-sought ground state deformation in lightest Rn isotopes will be presented. The strong retardation (by a factor of ∼10) of the half-life of the new isotope 186Po relative to the classical Geiger-Nuttall rule for alpha decay will be also discussed. This indicates that the Geiger-Nuttall rule is broken in the lightest Po isotopes.
* This work was supported by the I3-EURONS Programme(contract no. RII3-CT-2004-506065), by the FWO-Vlaanderen and by the Interuniversity Attraction Poles Programme - Belgian State -(IAP grant P5/07)