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Measurement of neutron-induced fission cross-sections for natPb, 208Pb, 197Au, natW, and 181Ta in the intermediate energy region
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Neutron Research.
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2004 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 70, no 5, 054603- p.Article in journal (Refereed) Published
Abstract [en]

Neutron-induced fission cross-section ratios natPb∕209Bi, 208Pb∕209Bi, 197Au∕209Bi, natW∕209Bi, 181Ta∕209Bi, and 209Bi∕238U have been measured in the 30–180 MeV energy range using the neutron beam facility at The Svedberg Laboratory in Uppsala. The 7Li(p,n) reaction was employed as a neutron source. The fission fragments were detected by thin-film breakdown counters. Cross sections at specific energies were determined using unfolding techniques with respect to the excitation function and the neutron spectra, the latter obtained from recent measurements and an evaluation. The absolute fission cross sections were obtained using the standard 238U(n,f) cross section. The natW(n,f) and 181Ta(n,f) cross sections have been measured for the first time. The results for 209Bi(n,f), natPb(n,f), 208Pb(n,f), and 197Au(n,f) cross sections have been compared with available literature data. A universal easy-to-use parametrization has been suggested for all measured cross sections. The common features of subactinide neutron-induced fission cross sections are found to be similar to those of the proton-induced fission data.

Place, publisher, year, edition, pages
2004. Vol. 70, no 5, 054603- p.
National Category
Subatomic Physics
URN: urn:nbn:se:uu:diva-71153DOI: 10.1103/PhysRevC.70.054603OAI: oai:DiVA.org:uu-71153DiVA: diva2:99064
Available from: 2005-04-29 Created: 2005-04-29 Last updated: 2013-11-07Bibliographically approved

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Blomgren, JanProkofiev, Alexander V.Olsson, Nils
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Department of Neutron ResearchThe Svedberg Laboratory
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Physical Review C. Nuclear Physics
Subatomic Physics

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