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Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Kern- und Teilchen-Astrophysik

HK 36.2: Group Report

Thursday, March 13, 2008, 17:00–17:30, 2B

Progress in determining keV neutron cross sections with AMS — •Iris Dillmann1,2, Anton Wallner3, Georg Rugel2, Laurent Coquard4, Stephan Walter1, Franz Käppeler1, Oliver Forstner3, Robin Golser3, Alfred Priller3, Peter Steier3, Thomas Faestermann2, Klaus Knie5, Gunther Korschinek2, and Michael Poutivsev21Institut für Kernphysik, Forschungszentrum Karlsruhe, Postfach 3640, D-76021 Karlsruhe — 2Physik Department, Technische Universtät München, D-85747 Garching — 3Vienna Environmental Research Accelerator, Institut für Isotopenforschung und Kernphysik, Universität Wien, A-1090 Wien — 4Technische Universität Darmstadt, Institut für Kernphysik, D-64289 Darmstadt — 5Gesellschaft für Schwerionenforschung, D-64291 Darmstadt

This status report deals with the progress in the measurements of keV-neutron cross sections with a combination of the activation technique and accelerator mass spectrometry. The neutron activations were done at the Karlsruhe 3.7 MV Van de Graaff accelerator using the 7Li(p,n)7Be neutron source, and the subsequent AMS measurements performed at the VERA facility in Vienna and the Maier-Leibnitz laboratory in Munich. The (n,γ) cross sections of 9Be, 13C, 235U, and the 14N(n,p) reaction were activated with a quasi-stellar neutron distribution of kT=25 keV and with monoenergetic neutron beams of 140, 220, and 500 keV. Further (n,γ) measurements on 35Cl, 40Ca, 54Fe, 58,62Ni, and 78Se were performed at kT=25 keV and will be compared to previous TOF measurements.

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