Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 32: Kernphysik/Spektroskopie
HK 32.5: Vortrag
Dienstag, 8. März 2005, 18:00–18:15, TU MA005
New results on the neutron-induced fission cross-section of 231Pa — •A. Oberstedt1, S. Oberstedt2, F.-J. Hambsch2, V. Fritsch2, G. Vladuca3, and A. Tudora3 — 1Dept. of Natural Sciences, Örebro University, SE-70182 Örebro — 2EC-JRC Institute for Reference Materials and Measurements, B-2440 Geel — 3Faculty of Physics, Bucharest University, RO-76900 Bucharest
Our studies of neutron-induced reactions for advanced nuclear applications have recently been extended to the nuclide 231Pa. In accordance with the heavier isotope 233Pa, which we reported about previously, 231Pa is supposed to play an important role for future reactors involving the thorium-uranium fuel cycle. Thus, 231Pa belongs to the isotopes that were pointed out by the IAEA to be investigated with highest priority. Although the neutron-induced fission cross-section has been measured before, the compiled experimental results as well as data in existing evaluated data files exhibit quite some differences. For this reason we have performed new experiments with a quasi mono-energetic neutron beam, provided by the Van de Graaff accelerator at IRMM. The first results, covering the neutron energy range from 0.8 to 3.5 MeV, will be presented.