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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 (T_1/2=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.