Measurement of fission cross-section for 134Te and 134I in 232Th(n,f) reaction induced by 14MeV neutrons

• Published in: Radiation physics and chemistry (Oxford, England : 1993) Vol. 141; pp. 138 - 141
• Main Authors: Zhengwei, Zhang, Shuangtong, Liu, Qiang, Wang, Changlin, Lan, Xingcai, Guan, Caifeng, Lai, Kaihong, Fang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2017
• Subjects: 14 MeV neutrons; 232Th(n,f); Activation technique; Fission cross-section; 14MeV neutrons; Activation technique; 232Th(n,f); Fission cross-section
• ISSN: 0969-806X; 1879-0895
• DOI: 10.1016/j.radphyschem.2017.06.018

The fission cross-sections of the 232Th(n,f)134Te and 232Th(n,f)134I reactions induced by neutrons around 14MeV were measured by the neutron activation and off-line gamma ray technique. The neutron fluence was monitored on line using the accompanying α-particles from the T(d,n)α reaction, meanwhile, neutron energies were obtained from the cross-section ratio method of 90Zr(n,2n)89(m+g)Zr to 93Nb(n,2n)92mNb reactions. The experimentally determined 232Th(n,f)134Te reaction cross-sections are 9.57±0.47mb at En=14.1±0.3MeV, 10.0±0.5mb at En=14.5±0.3MeV and 10.7±0.6mb at En=14.7±0.3MeV, respectively. Whereas, the isotope 134I of which characteristic γ-rays were detected in the γ-spectrum was concluded to be originated from 134Te decay. According to the cascade deduction formulism, the cross-section of 232Th(n,f)134I was estimated to be below a value (~5.7×10−3mb) refered to the Minimal Detectable Activity (MDA) with the gamma measurements. •By NAA method, D-T neutrons were used to bombard 232Th sample.•This work mainly focused on the fission fragments with mass number A=134.•Fission cross-section data were deduced for 232Th (n,f)134Te and 232Th(n,f)134I.