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Report No.

Evaluation of neutron nuclear data on tantalum isotopes

Shibata, Keiichi

Neutron nuclear data on $$^{179,180m,181,182}$$Ta have been evaluated for the next version of Japanese Evaluated Nuclear Data Library general-purpose file in the energy region from $$10^{-5}$$ eV to 20 MeV. Resolved resonance parameters were selected from experimental data, while unresolved ones were obtained from nuclear model calculations. A statistical model code CCONE was applied to evaluate cross sections above the resolved resonance region. Compound, pre-equilibrium and direct-reaction processes were considered for cross-section calculation. Coupled-channel optical model parameters were employed for the interaction between neutrons and nuclei. Giant-dipole and pygmy resonance parameters for E1 $$gamma$$-ray transition from tantalum isotopes were determined so as to reproduce measured $$gamma$$-ray spectrum. The present results reproduce experimental data very well, and are much better than the JENDL-4.0 evaluation. The evaluated data are compiled into ENDF-formatted data files.



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Category:Nuclear Science & Technology



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