Neutron-Induced Fission Cross Section of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi>P</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>233</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow><mi>a</mi></math></span> between 1.0 and 3.0 MeV

F. Tovesson; F.-J. Hambsch; A. Oberstedt; B. Fogelberg; E. Ramström; S. Oberstedt

doi:10.1103/PhysRevLett.88.062502

Neutron-Induced Fission Cross Section of ${}^{233}P a$ between 1.0 and 3.0 MeV

F. Tovesson, F.-J. Hambsch, A. Oberstedt, B. Fogelberg, E. Ramström, and S. Oberstedt

Phys. Rev. Lett. 88, 062502 – Published 28 January 2002

Abstract

The energy dependent neutron-induced fission cross section of ${}^{233}P a$ 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.

Received 11 September 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.062502

Authors & Affiliations

F. Tovesson^1,2, F.-J. Hambsch¹, A. Oberstedt², B. Fogelberg³, E. Ramström^2,3, and S. Oberstedt¹

¹EC-JRC-Institute of Reference Materials and Measurements (IRMM), Retieseweg, B-2440 Geel, Belgium
²Department of Natural Sciences, Örebro University, SE-70182 Örebro, Sweden
³Department of Radiation Sciences, Uppsala University, SE-61182 Nyköping, Sweden