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The pre-neutron-emission mass distributions for reaction $^{232}$Th(n, f) upto 60 MeV are systematically studied with an empirical fission potential model.The energy dependences of the peaks and valleys of the pre-neutron-emissionmass distributions are described by the exponential expressions based on thenewly measured data. The energy dependence of evaporation neutrons beforescission, which plays a crucial role for the reasonable description of the massdistribution, is also considered. Both the double-humped and triple-humpedshape of the measured pre-neutron-emission mass distributions for reaction$^{232}$Th(n, f) are reasonably well reproduced at incident energies up to 60MeV. The mass distributions at unmeasured energies and the critical energies atwhich the humped pre-neutron-emission mass distributions are transformed intoeach other are also predicted.

Pre-neutron-emission mass distributions for reaction $^{232}$Th(n, f) up to 60 MeV