Abstract
Neutron-induced cross section is one of the key quantities in nuclear physics and nuclear engineering. The integral experiment can give good feedback to the cross sections with low uncertainties. Using the optical model and statistical model, the neutron-induced total and capture cross sections of153Eu are revaluated according to the experimental microscopic total cross sections and the PROFIL-2 integral experiment. The corresponding uncertainties and covariances are determined with the data assimilation method implemented in CONRAD code. On the other hand, the previous interpretation of the PROFIL-2 experiment showed that JEFF-3.1 overestimates the neutron-induced capture cross section of 151 Eu by a factor of 2. Further analysis performed in the present work points out that the large difference between calculation and experimental data is mainly due to the lack of152m1 Eu in ERANOS code, which was used to interpret the PROFIL-2 experiment. The correction of 152m1Eu on the interpretation largely reduces the difference between JEFF-3.1 and PROFIL-2 and shows the agreement between the PROFIL-2 integral experiment and other microscopic measurements. The revaluated neutron-induced total and capture cross sections of 151 Eu and 153Eu correspond well with both the microscopic experimental measurements and the PROFIL-2 integral experiment.
Highlights
Neutron cross section is one of the most important quantities in both nuclear physics and nuclear engineering
The interpretation of the PROFIL-2 experiment with JEFF-3.1 library [3] shows that the ratio of calculated to experimental value concerning the neutron capture cross section of 151Eu is 1.980 [2]
The capture cross sections have little difference to JEFF-3.1. Both JEFF-3.1 and the reevaluated cross sections are in good agreement with experimental data
Summary
Neutron cross section is one of the most important quantities in both nuclear physics and nuclear engineering. Large experimental uncertainties exist for cross section measurements. The interpretation of the PROFIL-2 experiment with JEFF-3.1 library [3] shows that the ratio of calculated to experimental value concerning the neutron capture cross section of 151Eu is 1.980 [2]. This value points out that JEFF-3.1 overestimated about 100% the neutron capture cross section of 151Eu. The present work focuses on the analyses and evaluations of neutron-induced capture cross section of the Europium isotopes 151Eu and 153Eu based on the PROFIL-2 experimental data. The present work focuses on the analyses and evaluations of neutron-induced capture cross section of the Europium isotopes 151Eu and 153Eu based on the PROFIL-2 experimental data. 151Eu and 153Eu were in the same containers in the PROFIL-2 irradiated experiment
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