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Sheng-Dong Zhang, Lei Yang, Jingru Guo, Fangding Wang, An-Zhi Cui, Lijun Diao

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

Keywords: Thermal neutron cross section, Radiochemical separation of 126Sn, High-resolution γ-ray spectrometry

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

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 94, 08/2006
Pages: 385 - 390

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