L. Csige, D. M. Filipescu, T. Glodariu, J. Gulyás, M. M. Günther, D. Habs, H. J. Karwowski, A. Krasznahorkay, G. C. Rich, M. Sin, L. Stroe, O. Tesileanu, P. G. Thirolf
The photofission cross-section of 238U was measured at sub-barrier energies as a function of the gamma-ray energy using, for the first time, a monochromatic, high-brilliance, Compton-backscattered gamma-ray beam. The experiment was performed at the High Intensity gamma-ray Source (HIgS) facility at beam energies between E=4.7 MeV and 6.0 MeV and with ~3% energy resolution. Indications of transmission resonances have been observed at gamma-ray beam energies of E=5.1 MeV and 5.6 MeV with moderate amplitudes. The triple-humped fission barrier parameters of 238U have been determined by fitting EMPIRE-3.1 nuclear reaction code calculations to the experimental photofission cross section.
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http://arxiv.org/abs/1302.3425
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