The photofission cross section of 232Th was measured in the energy range 250–1200 MeV using a monochromatic tagged photon beam and a parallel-plate avalanche detector. The 232Th nuclear photofissility was obtained by measuring simultaneously and in the same energy range the photofission cross section of 238U and assuming a photofissility equal to one for 238U. It was found that, contrary to the case for heavier actinides, the 232Th 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 Th232 measured with tagged photons from 250 to 1200 MeV
CORVISIERO, PIETRO;RICCO, GIOVANNI;SANZONE, MARCELLA;TAIUTI, MAURO GINO;
1993-01-01
Abstract
The photofission cross section of 232Th was measured in the energy range 250–1200 MeV using a monochromatic tagged photon beam and a parallel-plate avalanche detector. The 232Th nuclear photofissility was obtained by measuring simultaneously and in the same energy range the photofission cross section of 238U and assuming a photofissility equal to one for 238U. It was found that, contrary to the case for heavier actinides, the 232Th 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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