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Neutron total and capture cross–section measurements of  155 Gd and  157 Gd 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 59.41.7 and 251.94.6 kilobarn for  155 Gd and  157 Gd, 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 59.02.5 and 247.43.9 kilobarn for  155 Gd and  157 Gd, respectively. The present total and capture cross sections agree well within the standard deviations. The results for  155 Gd 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  157 Gd 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.

journal of nuclear science and technology

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