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233Pa(n, f) cross section up to En=8.5 MeV
Örebro University, Department of Natural Sciences. (Subatomär fysik)
Örebro University, Department of Natural Sciences. (Subatomär fysik)
Örebro University, Department of Natural Sciences. (Subatomär fysik)
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2004 (English)In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 733, no 1-2, p. 3-19Article in journal (Refereed) Published
Abstract [en]

The energy dependence of the neutron-induced fission cross section of 233Pa has been measured directly for the first time from the fission threshold up to En=8.5 MeV. This reaction plays an important role in the thorium-uranium fuel cycle, and is thus of interest for the design and modeling of advanced reactor and transmutation facilities. The existing information in the ENDF/B-VI and JENDL-3.3 evaluated nuclear data files differ by a factor of two for the 233Pa(n, f) cross section values and show different fission threshold energies. Our new experimental data give lower cross section values than both evaluations and resolves the question about the threshold energy. In addition to the experimental investigation, also a new theoretical calculation of the reaction cross section has been performed with the statistical model code STATIS, showing a good agreement with the experimental data.

Place, publisher, year, edition, pages
2004. Vol. 733, no 1-2, p. 3-19
National Category
Subatomic Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:oru:diva-3091DOI: 10.1016/j.nuclphysa.2003.11.054OAI: oai:DiVA.org:oru-3091DiVA, id: diva2:136885
Available from: 2003-11-21 Created: 2003-11-21 Last updated: 2017-12-14Bibliographically approved
In thesis
1. The neutron-induced fission cross section of 233Pa: and the quest for clean and safe nuclear energy
Open this publication in new window or tab >>The neutron-induced fission cross section of 233Pa: and the quest for clean and safe nuclear energy
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Neutron-induced fission of 233Pa has been investigated between 1.0 and 8.5 MeV, and the reaction cross section was determined. Due to the short half-life of 233Pa for β-decay, fission events from the daughter product 233U affect the analysis of the protactinium experiment. In order to be able to correct for this contamination by ingrowing 233U, its fission cross section was measured as well in the same energy region.

The result for the 233Pa(n,f) cross section is compared with previous theoretical evaluations and indirect cross section estimations extracted from fission probability data. The cross section data that were measured in this work are lower than all other values for this isotope. The 233U(n,f) cross section values are also compared to evaluations. The evaluations for the neutron-induced fission cross section of 233U(n,f) are based on a large set of experimental values, and are thus considered to be very accurate. A good agreement between the results obtained in this work and the evaluations is observed in this case.

New model calculations, based on the statistical model for nuclear reactions, are compared to the experimental results for the 233Pa(n,f) cross section. These theoretical calculations describe the experimental results very accurately, and can be used to extract information about the fissioning system.

The main motivation for this work is its relevance for the thorium-based nuclear fuel cycle, which has been proposed for advanced reactor facilities intended for safe power supply and transmutation of nuclear waste.

Place, publisher, year, edition, pages
Örebro: Örebro universitetsbibliotek, 2003. p. 78
Series
Örebro Studies in Physics, ISSN 1652-148X ; 1
Keywords
Fysik, fission, cross section, Pa-233, U-233, fysik
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:oru:diva-50 (URN)91-7668-363-X (ISBN)
Public defence
2003-12-12, Hörsal P1, Prismahuset, Fakultetsg. 1, Örebro, 10:00 (English)
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Available from: 2003-11-21 Created: 2003-11-21 Last updated: 2017-10-18Bibliographically approved

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Tovesson, FredrikBirgersson, E.Flenéus, M.Oberstedt, Andreas

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