Hannover 2010 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 4: Beschleunigermassenspektrometrie und Anwendungen I
MS 4.6: Vortrag
Mittwoch, 10. März 2010, 12:00–12:15, F 428
53Mn - a long-lived activation product in a nuclear fusion environment — •Claudia Lederer1, Iris Dillmann2, Thomas Faestermann2, Axel Klix3, Gunther Korschinek2, Johannes Lachner2, Mikhail Poutivtsev2, Georg Rugel2, Klaus Seidel3, Herbert Vonach1, and Anton Wallner1 — 1VERA-Labor, Fakultät für Physik, Universität Wien, Österreich — 2Physik Department, Technische Universität München, Deutschland — 3Inst. f. Kern- und Teilchenphysik, TU und FZ Dresden, Deutschland
Since nuclear fusion devices as a potential energy source seem feasible, there is a strong need for accurate cross-section data to estimate production of long-lived radioisotopes. 53Mn (T1/2=3.7 Myr) is considered to contribute significantly for long-term waste disposal. It is mainly produced via interaction of 14-MeV (fusion) neutrons with Fe- and Ni-containing structure materials (predominantly via reactions on 54Fe). Fe samples, enriched in 54Fe, were irradiated with quasi-monoenergetic neutrons of energies from 13.4 to 14.9 MeV at the 14 MeV neutron generator of the TU Dresden. The number of produced 53Mn nuclei was quantified via AMS, utilizing the 14-MV tandem at the MLL of TU and LMU Munich. Previous measurements indicate nearly constant cross-section values of about 200 mb around 14 MeV, whereas evaluations show an increasing excitation function between 400 and 600 mb. Our results, which are the first ones based on AMS, suggest even higher cross-sections. These new experimental data will allow to forecast 53Mn activation for an ITER-like device with a significant reduction of present uncertainties.