| 1. |
- Tovesson, Fredrik, et al.
(författare)
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233Pa(n, f) cross section up to En=8.5 MeV
- 2004
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Ingår i: Nuclear Physics A. - : Elsevier BV. - 0375-9474 .- 1873-1554. ; 733:1-2, s. 3-19
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 2. |
- Tovesson, Fredrik, et al.
(författare)
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Neutron-induced fission cross section of 233Pa between 1.0 and 3.0 MeV
- 2002
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 88:6, s. 062502-
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Tidskriftsartikel (refereegranskat)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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| 3. |
- Tovesson, Fredrik, et al.
(författare)
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The Pa-233 fission cross section
- 2002
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Ingår i: Journal of Nuclear Science and Technology. - : Informa UK Limited. - 0022-3131 .- 1881-1248. ; 39:Supplement 2, s. 210-213
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 4. |
- Vladuca, G., et al.
(författare)
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Calculation of the neutron-induced fission cross section of 233Pa
- 2004
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Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 69:2, s. 021604-
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 5. |
- Tovesson, Fredrik, et al.
(författare)
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Fission fragment properties and the problem of the pulse height defect
- 2002
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Ingår i: Journal of Nuclear Science and Technology. - 0022-3131 .- 1881-1248. ; Supplement 2, s. 673-676
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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