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Tübingen 2003 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 7: Kern- und Teilchen-Astrophysik I

HK 7.6: Talk

Monday, March 17, 2003, 17:30–17:45, F

The 135Cs(n) cross section at 30, 200, and 500 keV — •Saed Dababneh1, Panayotis A. Assimakopoulos2, Sotirios Harissopoulos3, Michael Heil1, Franz Käppeler1, Dimitrios Karamanis2, Nikolas Patronis2, and Ralf Plag11Forschungszentrum Karlsruhe, Institut für Kernphysik, Postfach 3640, D-76021 Karlsruhe, Germany — 2The University of Ioannina, Department of Physics, Nuclear Physics Laboratory, 45110 Ioannina, Greece — 3NCSR "Demokritos", Institute of Nuclear Physics, 15310 Athens, Greece

First results of the measurement of the neutron capture cross section of the unstable isotope 135Cs at 30, 200, and 500 keV are reported. The sample consists of only ≃ 2×1015 atoms and was produced by ion implementation in a high resolution mass separator. The activation technique is used to obtain the cross section by irradiation in a quasi monoenergetic neutron beam. This will allow to determine the stellar cross section at the thermal energies characteristic for He burning scenarios, in particular at kT ≃ 8 keV and ≃ 26 keV. The induced activities are measured with a high efficiency detection system consisting of two Ge Clover arrays in close geometry. It is planned to determine the number of 135Cs nuclei in the sample by a final activation with thermal neutrons.

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