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Report No.
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Research Report; Data Analysis of Neutron Cross Section Measurement by LLFP Nuclides

Furutaka, Kazuyoshi  

This report describes a research done at Oak Ridge National Laboratory (ORNL) under the collaborative program on "neutron reaction cross section of long-lived fission fragment nuclides" between Japan Nuclear Cycle development institute and ORNL. The author has analysed the data on promptly emitted gamma rays in thermal neutron capture reaction by a LLFP nuclide, $$^{99}$$Tc, and deduced its reaction cross section during his residence on ORNL. In the analysis, a total of 1086 gamma rays were confirmed as prompt transitions in $$^{100}$$Tc emitted the reaction. From the data for these gamma rays, a decay scheme was constructed. Six of the prompt gamma rats were regarded as transitions to the ground-state of $$^{100}$$Tc. By summing-up intensities of the six transitions, a lower-limit for the reaction cross section was obtained to be 21.37$$pm$$0.62b. From the yields of the gamma rays in $$^{100}$$Ru, which are produced by beta-decay of $$^{100}$$Tc, the reaction cross section was also obtained to be 22.8$$pm$$1.8b. On the other hand, the reaction cross section obtained from intensities and energies of the observed gamma rays amounted only to 6.65b, which suggested that there remained a large number of high-energy gamma rays which are too weak to be observed.

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