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Fission Cross Section Measurements of Th-229 and Pa-231 Using Linac-Driven Lead Slowing-Down Spectrometer

Kobayashi, K
Research Reactor Institute, Kyoto University,

Yamamoto, S
Research Reactor Institute, Kyoto University,

Kai, T
Japan Atomic Energy Research Institute,

Cho, HJ
Research Reactor Institute, Kyoto University,
Visiting scientist,University of Ulsan,

Yamana, H
Research Reactor Institute, Kyoto University,

Fujita, Y
Research Reactor Institute, Kyoto University,

Mitsugashira, T
The Oarai-branch, Institute for Material Research, Tohoku University,

Kimura, I
Institute of Nuclear Technology, Institute of Nuclear Safety System, Inc.,

Pages: 8    Published: Jan 2001

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Source: STP1398-EB

Abstract

Making use of a back-to-back type double fission chamber and Kyoto University Lead slowing-down Spectrometer (KULS) driven by a 46 MeV electron linear accelerator (linac) at the Research Reactor Institute, Kyoto University (KURRI), the neutron-induced fission cross sections of Th-229 and Pa-231 have been measured relative to the ²³⁵U(n,f) reaction from ∼0.1 eV to 10 keV with energy resolution (FWHM) of about 40%. Each of the measured results has been compared with the evaluated data in ENDF/B-VI, JENDL-3.2 and JEF-2.2, whose data were broadened by the energy resolution of the KULS. The experimental data for the fission cross sections of Th-229 and Pa-231 have scarcely been obtained before in the relevant energy region.

Keywords:
fission cross section, measurement, Th-229, Pa-231, lead slowing-down spectrometer, back-to-back type double fission chamber, 0.1 eV to 10 keV energy range, JENDL-3.2, ENDF/B-VI, JEF-2.2

Paper ID: STP13627S
Committee/Subcommittee: E10.14
DOI: 10.1520/STP13627S
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