  A study of photofission on 181Ta nucleus induced by bremsstrahlung photons
with endpoint energies of 50 and 3500 MeV has been performed. The fission
yields have been measured by using the induced-activity method in an off-line
analysis. The absolute photofission cross sections for the tantalum target at
50 and 3500 MeV are found to be 5.4 \pm 1.1 microb and 0.77\pm0.11 mb,
respectively, and the corresponding deduced fissilities are (0.23\pm0.05) x
10^{-3} and (2.9 \pm 0.9) x 10^{-3}. Mass- and charge-yield distributions were
derived from the data. The results were compared with the simulated results
from CRISP code for multi-modal fission by assuming symmetrical fission mode.
