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Updated: Oct 2, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Neutron-induced fission cross section of 233Pa between 1.0 and 3.0 MeV
F Tovesson1, F J Hambsch, A Oberstedt
1EC-JRC-Institute of Reference Materials and Measurements (IRMM), Retieseweg, B-2440 Geel, Belgium.
Abstract:
The energy dependent neutron-induced fission cross section of 233Pa has for the first time been measured directly with monoenergetic neutrons. This nuclide is an important intermediary in a thorium based fuel cycle, and its fission cross section is a key parameter in the modeling of future advanced fuel and reactor concepts. A first experiment resulted in four cross section values between 1.0 and 3.0 MeV, establishing a fission threshold in excess of 1 MeV. Significant discrepancies were found with a previous indirect experimental determination and with model estimates.
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