Exploring the multi-humped fission barrier of 238U via sub-barrier photofission
L. Csige, D.M. Filipescu, T. Glodariu, J. Guly\'as, M.M. G\"unther, D., Habs, H.J. Karwowski, A. Krasznahorkay, G.C. Rich, M. Sin, L. Stroe, O., Tesileanu, P.G. Thirolf
TL;DR
This study measures the photofission cross-section of 238U at sub-barrier energies using a novel monochromatic gamma-ray beam, revealing transmission resonances and determining the triple-humped fission barrier parameters.
Contribution
First measurement of 238U photofission cross-section at sub-barrier energies with a high-brilliance gamma-ray beam, identifying transmission resonances and extracting fission barrier parameters.
Findings
Detection of transmission resonances at 5.1 and 5.6 MeV
Determination of triple-humped fission barrier parameters
Use of high-resolution, monochromatic gamma-ray beam
Abstract
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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