Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 10: Poster Session: Nuclear Physics/Spectroscopy

HK 10.33: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

²³³Pa(n,f) cross section for accelerator driven systems — •Andreas Oberstedt¹, Birger Fogelberg², Franz-Josef Hambsch³, Stephan Oberstedt³, Elisabet Ramström^1,2, and Fredrik Tovesson^1,3 — ¹Dept. of Natural Sciences, Örebro University, SE-70182 Örebro — ²Dept. of Radiation Science, Uppsala University, SE-61182 Nyköping — ³EU-JRC IRMM, B-2440 Geel

The fission cross section of ²³³Pa is of particular interest for reactivity calculations in accelerator driven systems (ADS) for nuclear power production involving ²³²Th-²³³U fuel cycles, since protactinium plays a keyrole as an intermediate nucleus in the formation of the fuel ²³³U. Neither previously known experimental values nor the fission cross section data in evaluated libraries (ENDF, JENDL) above the threshold were sufficiently accurate to meet the requirements of the IAEA. Despite the very short half-life of ²³³Pa of T_1/2=27.0 d and the corresponding high β-activity, we recently succeeded for the first time to measure directly the fission cross section for neutron energies between 1.0 and 6.0 MeV [1].

[1] F. Tovesson, F.-J. Hambsch, A. Oberstedt, B. Fogelberg, E. Ramström, S. Oberstedt, Phys. Rev. Lett. (in press)