Measurement of neutron total cross section of 169Tm in the energy range of 1-110 keV

To clarify the discrepancies of the σt of 169Tm in the keV energy region, the measurement was performed at the back streaming white neutron beam line of the China Spallation Neutron Source using the transmission method and the time-of-flight technique. The experimental background was quantitatively determined using a 7Li-glass scintillator with the saturated resonance absorption technique. And the experimental transmission in the unresolved resonance region was corrected for self-shielding effect using the SESH code. As a result, the σt of 169Tm in the 1-110 keV energy range was obtained.