Photofission of 238U Induced by a Quasi-monochromatic, Compton Backscattered gamma Beam
L. Csige, D.M. Filipescu, J. Gulyás, M. G_s02nther, D. Habs, H.J. Karwowski, A. Krasznahorkay, G.C. Rich, P.G. Thirolf
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Abstract
The photofission cross-section of 238U was measured in the sub-barrier energy region as a function of the gamma energy using, for the first time, a mono-chromatic, high-brilliance, Compton backscattered gamma beam. This prototype experiment was performed at the HIgamma S gamma beam facility of the Duke University at Durham (North Carolina, US) using the 238U(gamma ,f) reaction at a beam energy varied between Egamma = 4.7–6.0 MeV and with an energy resolution of Delta E = 150–200 keV (Delta E/Eapprox 3%). The photofission cross-section was determined down to E* = 4.7 MeV. Indications of transmission resonances have been observed at excitation energies of E* = 5.1 and 5.6 MeV with moderate amplitudes.
