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- W2085876415 abstract "The influence of a double-humped fission barrier on the photofission cross section far below the top of the barrier is considered. In the region about 2 MeV below the top of the outer barrier and at a cross section in the region of ${10}^{ensuremath{-}9}$-${10}^{ensuremath{-}6}$ b the photofission is expected to become almost entirely isomeric or delayed fission. When this occurs a shelf should appear in the photofission cross section where the cross section changes with energy far more slowly than at higher $ensuremath{gamma}$-ray energy. The cross section on the shelf can therefore be orders of magnitude higher than otherwise expected. While the angular distribution near the top of the barrier is expected to have a well-defined and nonisotropic angular dependence, the angular distribution on the shelf is expected to be isotropic. The cross sections, although small, appear to be measurable with bremsstrahlung beams in the 3- to 5- MeV range using a several hundred $ensuremath{mu}mathrm{A}$ electron beam. Successful experiments of this type should provide information on the shape of the inner and outer barriers at much lower excitation energies than possible by other techniques.NUCLEAR REACTIONS, FISSION Theory of photofission in the ${E}_{ensuremath{gamma}}=2ensuremath{-}6$ MeV region, a prominent shelf, experiments proposed." @default.
- W2085876415 created "2016-06-24" @default.
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- W2085876415 date "1975-09-01" @default.
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- W2085876415 title "A shelf in the subthreshold photofission cross section" @default.
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- W2085876415 doi "https://doi.org/10.1103/physrevc.12.856" @default.
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