Experimental cross section for the 139La(n, γ)140La reaction at 0.0536 eV

The neutron capture cross section for the 139 La(n, γ) 140 La reaction at 0.0536 eV was measured for the first time using monochromatic neutrons coming from a Triple Axis Spectrometer at the TRIGA Mark-II reactor. The neutron beam intensity was determined by irradiating Au-monitor foil together La 2 O 3 target. The radioactivity of the products was determined via high resolution γ-ray spectrometry. The obtained cross section value is 6.13±0.3b, which is 1.34% and 0.21 % lower than that in the ENDF/B-VII and JENDL-3.3 data library, respectively.