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

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