Exploring the multi-humped fission barrier of 238U via sub-barrier photofission

Csige, Lóránt and Filipescu, D. M. and Glodariu, T. and Gulyás, J. and Günther, M. M. and Habs, D. and Karwowski, H. J. and Krasznahorkay, Attila and Rich, G. C. and Sin, M. and Stroe, L. and Tesileanu, O. and Thirolf, P. G. (2013) Exploring the multi-humped fission barrier of 238U via sub-barrier photofission. PHYSICAL REVIEW C, 87 (4). ISSN 2469-9985

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Abstract

The photofission cross section of 238U was measured at sub-barrier energies as a function of the γ-ray energy using a monochromatic, high-brilliance, Compton-backscattered γ-ray beam. The experiment was performed at the High Intensity γ-ray Source (HIγS) facility at beam energies between Eγ=4.7 MeV and 6.0 MeV and with ∼3% energy resolution. Indications of transmission resonances have been observed at γ-ray beam energies of Eγ=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. © 2013 American Physical Society.

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