The photofission cross section of Th-232 was measured in the energy range 250-1200 MeV using a monochromatic tagged photon beam and a parallel-plate avalanche detector. The Th-232 nuclear photofissility was obtained by measuring simultaneously and in the same energy range the photofission cross section of U-238 and assuming a photofissility equal to one for U-238. It was found that, contrary to the case for heavier actinides, the Th-232 photofissility value does not saturate up to 1200 MeV. Rather, it lies between 0.6 and 0.8, and shows a weak energy dependence: it increases by about 15% over an interval of 1 GeV. A comparison of these experimental findings with the predictions of an intranuclear-cascade Monte Carlo calculation is given.
Photofissility Of Th-232 Measured With Tagged Photons From 250 To 1200 Mev
GERVINO, Gianpiero;
1993-01-01
Abstract
The photofission cross section of Th-232 was measured in the energy range 250-1200 MeV using a monochromatic tagged photon beam and a parallel-plate avalanche detector. The Th-232 nuclear photofissility was obtained by measuring simultaneously and in the same energy range the photofission cross section of U-238 and assuming a photofissility equal to one for U-238. It was found that, contrary to the case for heavier actinides, the Th-232 photofissility value does not saturate up to 1200 MeV. Rather, it lies between 0.6 and 0.8, and shows a weak energy dependence: it increases by about 15% over an interval of 1 GeV. A comparison of these experimental findings with the predictions of an intranuclear-cascade Monte Carlo calculation is given.
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