Neutron total and capture cross-section measurement and resolved resonance analysis of Er

Rovira Leveroni, G.   ; 木村 敦   ; 中村 詔司  ; 遠藤 駿典   ; 岩本 修  ; 岩本 信之  ; 片渕 竜也*

Rovira Leveroni, G.; Kimura, Atsushi; Nakamura, Shoji; Endo, Shunsuke; Iwamoto, Osamu; Iwamoto, Nobuyuki; Katabuchi, Tatsuya*

The neutron total and capture cross sections of Er were measured at the Accurate Neutron-Nucleus Reaction Measurement Instrument beamline in the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex. For the neutron total cross-section measurements, Li-glass detectors were employed to derive the neutron transmission ratio of three Er transmission samples with thicknesses of 1 mm, 0.175 mm and 0.05 mm. The neutron capture cross-section was determined from measurements of 0.025-mm-thick Er samples with NaI(Tl) and Ge spectrometers in separate experiments, since they offer complementary capabilities. Moreover, the capture cross-section of Er was derived below 1 eV, since it accounted for over 95% of the capture events in Er. Finally, the resolved resonance region up to 65 eV was analyzed using the REFIT code. The resonance parameters of 20 Er resonances, together with one resonance for each Er and Er were determined in a least-square fit using a combination of both capture data and the transmission data from the thicker 1 mm and 0.175 mm samples. T