Abstract
The neutron-induced fission cross section of has been measured at the CERN n_TOF facility relative to the standard fission cross section of from 20 keV to 1.4 MeV and of from 1.4 to 200 MeV. A fast ionization chamber (FIC) was used as a fission fragment detector with a detection efficiency of no less than 97%. The high instantaneous flux and the low background characterizing the n_TOF facility resulted in wide-energy-range data (0.02 to 200 MeV), with high energy resolution, high statistics, and systematic uncertainties bellow 3%. Previous investigations around the energy of the fission threshold revealed structures attributed to -vibrational levels, which have been confirmed by the present measurements. Theoretical calculations have been performed, employing the talys code with model parameters tuned to fairly reproduce the experimental data.
5 More- Received 21 December 2013
DOI:https://doi.org/10.1103/PhysRevC.89.044606
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