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The neutron-induced fission cross section of 233Pa: and the quest for clean and safe nuclear energy
Örebro University, Department of Natural Sciences.
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
Keyword [en]
Fysik, fission, cross section, Pa-233, U-233, fysik
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:oru:diva-50ISBN: 91-7668-363-X (print)OAI: oai:DiVA.org:oru-50DiVA, id: diva2:136888
Public defence
2003-12-12, Hörsal P1, Prismahuset, Fakultetsg. 1, Örebro, 10:00 (English)
Opponent
Supervisors
Available from: 2003-11-21 Created: 2003-11-21 Last updated: 2017-10-18Bibliographically approved
List of papers
1. Neutron-induced fission cross section of 233Pa between 1.0 and 3.0 MeV
Open this publication in new window or tab >>Neutron-induced fission cross section of 233Pa between 1.0 and 3.0 MeV
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2002 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 88, no 6, p. 062502-Article in journal (Refereed) Published
Abstract [en]

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.

National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:oru:diva-3089 (URN)10.1103/PhysRevLett.88.062502 (DOI)11863801 (PubMedID)
Available from: 2003-11-21 Created: 2003-11-21 Last updated: 2017-12-14Bibliographically approved
2. The Pa-233 fission cross section
Open this publication in new window or tab >>The Pa-233 fission cross section
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2002 (English)In: Journal of Nuclear Science and Technology, ISSN 0022-3131, E-ISSN 1881-1248, Vol. Supplement 2, p. 210-213Article in journal (Refereed) Published
Abstract [en]

The energy dependent neutron-induced fission cross section of 233Pa has for the first time been measured directly with mono-energetic neutrons. This isotope is produced in the thorium fuel cycle and serves as an intermediate step between the 232Th source material and the 233U fuel material. Four neutron energies between 1.0 and 3.0 MeV have been measured in a first campaign. Some preliminary results are presented and compared to literature.

National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:oru:diva-3090 (URN)
Available from: 2003-11-21 Created: 2003-11-21 Last updated: 2017-12-14Bibliographically approved
3. 233Pa(n, f) cross section up to En=8.5 MeV
Open this publication in new window or tab >>233Pa(n, f) cross section up to En=8.5 MeV
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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.

National Category
Subatomic Physics
Research subject
Physics
Identifiers
urn:nbn:se:oru:diva-3091 (URN)10.1016/j.nuclphysa.2003.11.054 (DOI)
Available from: 2003-11-21 Created: 2003-11-21 Last updated: 2017-12-14Bibliographically approved
4. Fission fragment properties and the problem of the pulse height defect
Open this publication in new window or tab >>Fission fragment properties and the problem of the pulse height defect
2002 (English)In: Journal of Nuclear Science and Technology, ISSN 0022-3131, E-ISSN 1881-1248, Vol. Supplement 2, p. 673-676Article in journal (Refereed) Published
Abstract [en]

The pulse height defect (PHD) has been investigated for three different counting gases commonly used in ionization chambers. The PHD introduces an underestimation of the kinetic energy of a charged particle detected with an ionization chamber. Thus, in some cases it is of crucial importance to correct for this effect, e.g. when studying fission fragment properties. A now method was used, applying a waveform digitizer, to study the PHD. The fission fragment properties from spontaneous fission of 252Cf where determined using different counting gases and different ways of correcting for the PHD were evaluated.

National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:oru:diva-3092 (URN)
Available from: 2003-11-21 Created: 2003-11-21 Last updated: 2017-12-14Bibliographically approved
5. Calculation of the neutron-induced fission cross section of 233Pa
Open this publication in new window or tab >>Calculation of the neutron-induced fission cross section of 233Pa
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2004 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 69, no 2, p. 021604-Article in journal (Refereed) Published
Abstract [en]

Since very recently, experimental data for the energy dependence of the 233Pa(n,f) cross section are finally available. This has stimulated a new, self-consistent cross section evaluation for the system n+233Pa in the incident neutron energy range 0.01–6 MeV. The results are quite different compared to earlier evaluation attempts. Since 233Pa is an important intermediary in the thorium based fuel cycle, its neutron reaction cross sections are key parameters in the modeling of future advanced reactor concepts.

National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:oru:diva-3093 (URN)10.1103/PhysRevC.69.021604 (DOI)
Available from: 2003-11-21 Created: 2003-11-21 Last updated: 2017-12-14Bibliographically approved

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