Fission cross section of the 232Th(n,f)131Sb reaction induced by neutrons around 14 MeV

Abstract

In order to make a more detailed study on the 232Th fission process, the cross section of 232Th(n,f)131Sb fission reaction induced by 14MeV neutrons was measured precisely with the neutron activation method and off-line gamma ray spectrometric technique. Neutron flux was monitored on line using the accompanying α particle from T(d,n)4He reaction in the irradiation and neutron energies were given by the cross section ratio of 90Zr(n,2n)89Zr reaction to 93Nb(n,2n)92mNb reaction. The experimentally determined cross sections were deduced to be 6.27±0.47, 6.19±0.54, 6.00±0.51mb at 14.1±0.3, 14.5±0.3 and 14.8±0.3MeV, respectively.