Evaluation of Neutron Nuclear Data on Bromine and Krypton Isotopes for JENDL-4.0

Abstract

Neutron nuclear data on 79;81 Br and 78;80;82;83;84;85;86 Kr have been evaluated for the evaluated nuclear data library JENDL-4.0 in the energy region from 10 À5 eV to 20 MeV. The resolved resonance parameters were adjusted so as to reproduce recommended or measured thermal capture cross sections for some isotopes. The statistical model was applied to calculate the cross sections above the resolved resonance region. In the calculations, coupled-channel optical model parameters were used for neutrons. Preequilibrium and direct-reaction processes were taken into account in addition to the compound process. The present evaluation is consistent with available experimental data. The evaluated results were compiled into JENDL-4.0.

The evaluated nuclear data library for ADS in China

“…All cross sections of neutron induced reactions, angular distributions, energy spectra and double differential cross sections are consistently calculated and evaluated for 23 Na, 24,25,26 Mg, 27 Theoretical calculated results are compared with existing experimental data, and the evaluated results from ENDF/B-VII [21] and JENDL-4 [22]. Good agreement is generally observed between the calculated results and the experimental data.…”

Important comments on KERMA factors and DPA cross-section data in ACE files of JENDL-4.0, JEFF-3.2 and ENDF/B-VII.1

“…It is known that KERMA factors of a lot of nuclei in the official ACE files are different among nuclear data libraries mainly because of inconsistent energy-balance [2]. We also pointed out that KERMA factors and DPA cross-section data were different among JENDL-4.0 [3], ENDF/B-VII.1 [4], JEFF-3.2 [5] and FENDL-3.0 [6] even for nuclei with consistent energy-balance by the following reasons [7]. i) Nuclear data issue -Incorrect Q value in nuclear data -Large gas production cross-section data ii) NJOY/HEATR module [1] issue -1 H of ENDF/B-VII.1 (this issue is corrected in NJOY2012.50) -mt = 102 data in file6 [8].…”

Nuclear data evaluation of long-lived fission products: Microscopic vs. phenomenological optical potentials

“…The advantage of the potential is that it can calculate the total and elastic scattering cross sections and the analyzing power successfully without considering complicated processes occuring in the target nuclei. Therefore, it is applied widely to the nuclear data evaluation of medium to heavy nuclei [1]. There are now many kinds of the optical potential parameterized both in local 1 and global forms.…”

“…Therefore, it is applied widely to the nuclear data evaluation of medium to heavy nuclei [1]. There are now many kinds of the optical potential parameterized both in local 1 and global forms.…”