Measurements of the neutron total and capture cross sections and derivation of the resonance parameters of Ta

Endo, Shunsuke   ; Kimura, Atsushi   ; Nakamura, Shoji  ; Iwamoto, Osamu  ; Iwamoto, Nobuyuki  ; Rovira Leveroni, G.   ; Toh, Yosuke   ; Segawa, Mariko   ; Maeda, Makoto  

The neutron transmission ratio and capture yield for Ta were measured in J-PARC MLF ANNRI to improve the accuracy of resonance parameters. The total cross section was determined from the transmission ratio in the energy range from 0.2 to 150 eV. The capture cross section was obtained from the capture yield using the pulse height weighting technique (PHWT) in the energy range from thermal to 150 eV. The obtained transmission ratio and capture cross-section were fitted by the resonance analysis code, REFIT, and the resonance parameters were determined below 150 eV. It was also discussed the correlations caused by fitting based on statistical uncertainty and correlations for systematic uncertainty based on sample thickness in the transmission measurements.