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The thermal neutron cross sections of the reactions  126 Sn( n , γ) 127g Sn and  126 Sn( n , γ) 127m Sn were measured for the first time. A radiochemical carrier-free separation procedure of  126 Sn from high level liquid waste (HLLW) is based on the anion exchange and PbS co-precipitation. The ( n , γ) reactions on  197 Au and  55 Mn were used as monitors of thermal neutron flux in irradiation of  126 Sn samples. The radionuclides  126 Sn,  127g Sn,  127 Sb,  198 Au and  56 Mn were detected by HPGe γ-ray spectrometry. The experimentally obtained thermal neutron cross sections of the  126 Sn( n , γ) 127m Sn and  126 Sn( n , γ) 127g Sn reactions are:  126 Sn( n , γ) 127g Sn: σ g  = 0.200 ± 0.039 b  126 Sn( n , γ) 127m Sn: σ m  = 0.39 ± 0.10 b The total cross section of the reaction  126 Sn( n , γ) 127(m+g) Sn is 0.59 ± 0.14 b.

Measurement of thermal neutron cross sections of the reactions 126 Sn( n , γ) 127g,127m Sn