Measurements of the energy dependence of the cross section of245Cm fission by fast neutrons

The joint evaluated fission and fusion nuclear data library, JEFF-3.3

“…18 Top: total, elastic, inelastic, fission and capture cross sections for 244 Cm compared to the Gianotti model calculations [106] and the measurements [107][108][109][110][111][112]. Bottom: fission and capture cross sections for 244 Cm compared to the JENDL-4.0 and ENDF/B-VII.1 evaluations, the Gianotti model calculations [106] and the measurements [107][108][109][110][111][112] used. Fission cross sections were derived in the WKB approximation supposing a double-humped fission barrier with free parameters that were adjusted to experimental cross section data [99].…”

“…[107][108][109][110][111][112]. The correlation of total and fission cross sections for 244 Cm and the uncertainties compared to the measurements [106][107][108][109][110][111][112][113][114][115][116][117][118][119] Covariance data were generated by the Kalman code implemented in the EMPIRE system supposing a 10% uncertainty on the model parameters. These uncertainties were complemented in a Bayesian updating procedure with the experimental fission cross section data listed in Table 11.…”

Neutron-induced fission cross sections of short-lived actinides with the surrogate reaction method

“…The cross sections of Ref. [18], in the 1 to 3 MeV energy range, are significantly higher than those measured for neighboring fissile isotopes such as 245 Cm [19], [20] and 247 Cm [18], which are all below 2 barns. Moreover, under the reasonable assumption that the neutron inelastic scattering cross section of 243 Cm ranges from 1 to 1.5 barns at 2 MeV neutron energy, the value of the fission cross section of 2.6 barns obtained in Ref.…”

“…It represents the number of tritons, i.e., the number of compound nuclei, as a function of their excitation energy. The broad peaks at the highest excitation energies in the spectrum stem from transfer reactions on the carbon backing of the target and on 19 F target inpurities. The background from reactions on carbon is measured separately and subtracted from the singles spectrum.…”

“…The background from reactions on carbon is measured separately and subtracted from the singles spectrum. The resulting singles spectrum is interpolated under the 19 F impurity peak, introducing an additional source of uncertainty. This systematic error represents at most a 4% contribution to the overall uncertainty.…”