Neutron-induced fission cross section of Th232 from 1 eV to 20 keV

Yoshihiro Nakagome, Robert C. Block, Rudolf E. Slovacek, and Edgar B. Bean
Phys. Rev. C 43, 1824 – Published 1 April 1991
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Abstract

The neutron-induced fission cross section of Th232 has been measured from 1 eV to 20 keV using a lead slowing time spectrometer. The cross section was normalized to the U238(n,f) subthreshold cross section. In the energy region between 1 and 500 eV the fission cross section has a 1/v shape, and has a small peak near 5 keV. By extrapolation of 1/v the thermal fission cross section of 54±6 μb was deduced. The observed 1/v and small-peaked cross sections were interpreted as the fission through the vibrational states in the second well of a triple-humped fission barrier of Th233.

  • Received 19 November 1990

DOI:https://doi.org/10.1103/PhysRevC.43.1824

©1991 American Physical Society

Authors & Affiliations

Yoshihiro Nakagome

  • Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, Osaka 590-04, Japan

Robert C. Block and Rudolf E. Slovacek

  • Department of Nuclear Engineering and Engineering Physics, Rensselaer Polytechnic Institute, Troy, New York 12180

Edgar B. Bean

  • Knolls Atomic Power Laboratory, Schenectady, New York 12301

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Vol. 43, Iss. 4 — April 1991

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