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Report No.
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Interim Report on Research between Oak Ridge National Laboratory and Japan Nuclear Cycle Development Institute on Neutron-Capture Cross Sections by Long-Lived Fission Product nuclides

Furutaka, Kazuyoshi  ; Nakamura, Shoji  ; Harada, Hideo   ; Raman, S.*; Koehler, P. E.*

Neutron capture cross sections of long-lived fission products (LLFP) are important quantities as fundamental data for the study of nuclear transmutation of radioactive wastes. Previously obtained thermal-neutron capture $$gamma$$-ray data were analyzed to deduce the partial neutron-capture cross sections of LLFPs including 99Tc, 93Zr, and 107Pd for thermal neutrons. By comparing the decay $$gamma$$-ray data and prompt $$gamma$$-ray data for 99Tc, the relation between the neutron-capture cross section deduced by the two different methods was studied. For the isotopes 93Zr and 107Pd, thermal neutron-capture $$gamma$$-ray production cross sections were deduced for the first time. The level schemes of 99T, 93Zr, and 107Pd have also been constructed from the analyzed data and compared with previously reported levels. This work has been done under the cooperative program "Neutron Capture Cross Sections of Long-Lived Fission Products (LLFPs)" by Japan nuclear cycle development institute (JNC) and Oak Ridge National Laboratory (ORNL).

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