Neutron total and capture cross-section measurements of ¹⁵⁵Gd and ¹⁵⁷Gd in the thermal energy region with the Li-glass detectors and NaI(Tl) spectrometer installed in J-PARC‧MLF‧ANNRI

Neutron total and capture cross-section measurements of ¹⁵⁵Gd and ¹⁵⁷Gd were performed with Li-glass detectors and a NaI(Tl) spectrometer in the ANNRI at the MLF of the J-PARC. The neutron total cross sections were determined in the energy region from 5 to 100 meV, and those at the thermal neutron energy were obtained to be 59.4 ± 1.7 and 251.9 ± 4.6 kilobarn for ¹⁵⁵Gd and ¹⁵⁷Gd, respectively. The neutron capture cross sections were determined in the energy region from 3.5 to 100 meV with an innovative method, and those at the thermal energy were obtained as 59.0 ± 2.5 and 247.4 ± 3.9 kilobarn for ¹⁵⁵Gd and ¹⁵⁷Gd, respectively. The present total and capture cross sections agree well within the standard deviations. The results for ¹⁵⁵Gd were found to be consistent with the values in JENDL-4.0 and the experimental data given by Møller et al., Mastromarco et al. and Leinweber et al. Those for ¹⁵⁷Gd agreed with the evaluated data in JENDL-4.0 and the experimental data by Møller et al. and Mastromarco et al. However, they disagree (11% larger) with the experimental result by Leinweber et al. (author)