Neutron Cross-Section Evaluations for ²³⁸U up to 150 MeV

CTOF measurements and Monte Carlo analyses of neutron spectra for the backward direction from a lead target irradiated with 200–1000 MeV protons

“…24 shows several examples of gas production cross-section calculations by CEM03.01 from n+ 56 Fe, p+ 208 Pb, and n+ 238 U reactions compared with experimental data [139]- [141] and results by TALYS from [140], McGNASH [142], and IPPE-99 [143]. The overall agreement of the results by CEM03.01 with these data is similar to that achieved by TALYS, McGNASH, and IPPE-99.…”

“…We see that the preequilibrium contribution to the total yield of 4 He from this reaction is about one order of magnitude higher than contributions from other reaction mechanisms considered by our model. [141] and results by TALYS from [140], McGNASH [142], and IPPE-99 [143]. For the production of 4 He from n+ 238 U (bottom plot), we show the total cross section as predicted by CEM03.01 with a thick red solid line, as well as contributions to it from preequilibrium emission, from events with evaporation that are not followed by fission, from evaporation before fission, evaporation from fission fragments, total evaporation (both with and without fission), and from coalescence, shown with different color lines as indicated in the legend.…”

Is a global coupled-channel dispersive optical model potential for actinides feasible?

“…Optical model calculations of the total cross section for 232 Th and 238 U nuclei were carried out with the newly fitted DCCOM potential, NDOMP04, and the OMPs of Ignatyuk et al [26,28], Maslov [5], and Maslov et al [25]. The calculated total neutron cross-section data were used to obtain the ratio R232 Th− 238 U for each of employed potentials.…”

“…A new global parametrization using nondispersive CC OMPs for actinide nuclei valid from 1 keV to 200 MeV was recently proposed by Soukhovitskiĩ and co-workers [24] (in the following text we refer to this work as NDOMP04). CC OMPs describing nucleon scattering on 238 U nucleus up to 150-200 MeV became recently available [25,26]. During the past year, several new OMPs for thorium are being discussed within the framework of the on going International Atomic Energy Agency Coordinated Research Program [27], including those derived by Maslov [5] and Ignatyuk and co-workers [28].…”

Development of High-Energy BROND Library up to 150 MeV

“…In particular, the codes of the intranuclear-cascade model combined with the evaporation model have been successfully applied for the energies above a few hundred MeV. Analogous evaluations for the most important fissile isotopes 232 Th, 238 U, 237 Np, 239 Pu, 240 Pu, and 241 Am have been performed in the Institute of Physics and Power Engineering [3][4][5][6]. For this reason, it was decided that the energy region from 20 to 150 MeV requires special consideration, and the evaluated data files for this energy region should be prepared for the most important structural and fissile materials in the same manner as for the energy region below 20 MeV [1].…”