Experimental reevaluation of <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi mathvariant="normal">U</mi><mprescripts></mprescripts><none></none><mn>235</mn></mmultiscripts></math> fission yields at the Egypt Second Research Reactor (ETRR-2)

Nader M. A. Mohamed; Fatma S. Abdou; Abdullah M. Othman; Mohamed A. Elsaied; Mohamed Shabib; Asmaa G. Abo Elnour; D. H. Daher; Mohamed Soliman

doi:10.1103/kk53-sd41

Experimental reevaluation of ${}^{235}U$ fission yields at the Egypt Second Research Reactor (ETRR-2)

Nader M. A. Mohamed^1,*, Fatma S. Abdou ^2,3, Abdullah M. Othman^3,4, Mohamed A. Elsaied¹, Mohamed Shabib^3,5, Asmaa G. Abo Elnour ^1,3, D. H. Daher ¹, and Mohamed Soliman ^3,6

¹Reactors Department, Nuclear Research Center, Egyptian Atomic Energy Authority, 13759 Cairo, Egypt
²Reactor Physics Department, Nuclear Research Center, Egyptian Atomic Energy Authority, 13759 Cairo, Egypt
³Egypt Second Research Reactor, Egyptian Atomic Energy Authority, 13759 Cairo, Egypt
⁴Labeled compounds Department, Hot Labs Center, Egyptian Atomic Energy Authority, 13759 Cairo, Egypt
⁵Radiation Physics Department, National Center for Radiation Research and Technology, Egyptian Atomic Energy Authority, 11787 Cairo, Egypt
⁶Radiation Protection and Civil Defense Department, Nuclear Research Center, Egyptian Atomic Energy Authority, 13759 Cairo, Egypt

^*Contact author: nader.mohamed@eaea.org.eg

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Phys. Rev. C 113, 034604 – Published 11 March, 2026

DOI: https://doi.org/10.1103/kk53-sd41

Abstract

In this study, the cumulative yields of 106 fission fragments produced from the thermal-neutron-induced fission of ${}^{235}U$ were experimentally determined. The measurements were carried out through short and long neutron irradiations of natural ${UO}_{2}$ samples at the Egypt Second Research Reactor (ETRR-2), followed by $γ$ -ray spectroscopy of the resulting radioactive fission products. The measured fission yields were compared with the corresponding data reported in the ENDF/B-VIII.1 and JEFF-3.3 nuclear data libraries. While the measured fission yields exhibit generally good agreement with the evaluated data reported in the ENDF/B-VIII.1 and JEFF-3.3 nuclear data libraries, significant discrepancies were observed for some fission products, even between the two evaluations themselves. Consequently, the assessment and refinement of fission yield data remain an ongoing scientific endeavor, contingent upon continual improvements in atomic, nuclear, and decay data, as well as advancements in experimental measurement techniques and theoretical modeling approaches. The cumulative fission product yields measured in this study can serve as benchmark data for the validation and improvement of fission yield evaluation models.

Physical Review C

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Experimental reevaluation of ${}^{235}U$ fission yields at the Egypt Second Research Reactor (ETRR-2)

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Experimental reevaluation of U235 fission yields at the Egypt Second Research Reactor (ETRR-2)

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Experimental reevaluation of ${}^{235}U$ fission yields at the Egypt Second Research Reactor (ETRR-2)