Abstract
Experimental fissility data from photofission reactions of $^{232}\mathrm{Th}$, $^{238}\mathrm{U}$, and $^{235}\mathrm{U}$ nuclei at 52 MeV have been obtained using monochromatic and polarized photon beams and dielectric fission-track detectors. These data, along with literature data for $^{237}\mathrm{Np}$, $^{235,238}\mathrm{U}$, $^{232}\mathrm{Th}$, $^{209}\mathrm{Bi}$, $^{208}\mathrm{Pb}$, and $^{174}\mathrm{Yb}$ nuclei have been analyzed within the framework of a simple two-step model for photofission reactions, i.e., absorption of the incident photon by a neutron-proton pair followed by an evaporation-fission competition mechanism for the excited nucleus. For nuclei in the Ta-Np region the trend of calculated fissilities clearly shows shell effects in the vicinity of $^{208}\mathrm{Pb}$. In the case of $^{238}\mathrm{U}$ the effect of photon polarization on fission direction has also been studied, and isotropy was observed in the fragment azimuthal distribution.
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