Measurement of fission cross section for Th-232(n,f)X-131(Z) (Z=50, 51, 52, 53) reaction induced by neutrons around 14 MeV

作者：Lan, Chang-lin; Qiu, Yi-jia; Wang, Qiang^*; Zhang, Zheng-wei; Zhang, Qian; Tan, Jun-cai; Lai, Cai-feng; Fang, Kai-hong

来源：European Physical Journal A, 2017, 53(6): 131.

DOI：10.1140/epja/i2017-12318-2

• TH-232(N
• ISOTOPES
• SYSTEMS
• 14MEV

The fission cross sections of Th-232(n,f)(131m,g) Sn, Th-232(n,f)(131) Sb, Th-232(n,f)(131m,g) Te, Th-232(n,f)(131I) fission reactions induced by 14MeV neutrons were measured precisely with the neutron activation technique. The neutron flux was monitored by accompanying alpha particle in the irradiation and the neutron energies were determined by the cross section ratio of Zr-90(n,2n)Zr-89 to Nb-93(n,2n)Nb-92m reaction. The values of the cross sections of Th-232(n,f)Sn-131m,Sn- g were analyzed, and the cross sections of Th-232(n,f)Sb-131 were deduced to be 6.5 +/- 0.7, 6.3 +/- 0.6, 6.1 +/- 0.6mb at 14.1 +/- 0.3, 14.5 +/- 0.3 and 14.8 +/- 0.3MeV, respectively. The values of the cross sections of Th-232(n,f)Te-131g were deduced to be 1.8 +/- 0.1, 1.5 +/- 0.1 and 1.4 +/- 0.1mb at 14.1 +/- 0.3, 14.5 +/- 0.3 and 14.8 +/- 0.3MeV, respectively. The values of the cross sections of Th-232(n,f)(131I) were given as 1.8 +/- 0.2, 1.6 +/- 0.2, 1.5 +/- 0.1mb at 14.1 +/- 0.3, 14.5 +/- 0.3 and 14.8 +/- 0.3MeV, respectively.

• 出版日期2017-6-21
• 单位中国工程物理研究院核物理与化学研究所; 中国工程物理研究院; 兰州大学