Phys. Rev. C 44, 1683–1686 (1991)Fission of complex nuclei induced by 52-MeV monochromatic and polarized photonsReceived 20 May 1991; published in the issue dated October 1991 Experimental fissility data from photofission reactions of 232Th, 238U, and 235U 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 237Np, 235,238U, 232Th, 209Bi, 208Pb, and 174Yb 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 208Pb. In the case of 238U the effect of photon polarization on fission direction has also been studied, and isotropy was observed in the fragment azimuthal distribution. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.44.1683
DOI:
10.1103/PhysRevC.44.1683
PACS:
25.85.Jg, 27.90.+b, 25.85.-w
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