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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 Dillmann^1,2, 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 Poutivsev² — ¹Institut 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.