Dresden 2011 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 1: Accelerator Mass Spectrometry and Applications
MS 1.5: Vortrag
Montag, 14. März 2011, 11:45–12:00, GÖR 229
AMS measurement of the reaction 35Cl(n,γ)36Cl — •Stefan Pavetich1, Tamás Belgya2, Max Bichler3, Iris Dillmann4, Oliver Forstner1, Robin Golser1, Franz Käppeler4, Zoltan Kis2, Martin Martschini1, Alfred Priller1, Peter Steier1, Georg Steinhauser3, Laszlo Szentmiklosi2, and Anton Wallner1 — 1VERA Laboratory, Faculty of Physics, Univ. of. Vienna, Austria — 2Department of Nuclear Research, Institute of Isotopes, Hungarian Academy of Science, Budapest — 3Atominstitut, TU Wien, Austria — 4Karlsruhe Institute of Technology, Germany
36Cl is a long-lived radionuclide (t1/2 = 301000 a), which is dominantly produced via the reaction 35Cl(n,γ)36Cl. In the present work we focused on: First, the production of an independent 36Cl/35Cl reference material for AMS and second, the determination of the Maxwellian averaged cross section (MACS) of 35Cl(n,γ)36Cl at 25 keV neutron energy, i.e. the energy range which is important for astrophysical network calculations. Approaching the first goal, NaCl pellets were irradiated with thermal neutrons in Vienna and Budapest. The neutron fluence, used for the calculation of the 36Cl/35Cl ratio of the irradiated samples, was determined via gold fluence monitores. For the determination of the neutron capture cross section of 35Cl at stellar energies, AMS measurements were performed on two samples, which were irradiated with neutrons of a Maxwell-Boltzmann energy distribution of 25 keV. Combining the AMS- and the neutron-fluence data, the MACS for 35Cl at 25 keV was calculated. The neutron irradiations, the measuring procedure of 36Cl at VERA and our new results will be presented.