تقرير
Late Time Emission of Prompt Fission Gamma Rays
| العنوان: | Late Time Emission of Prompt Fission Gamma Rays |
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| المؤلفون: | Talou, P., Kawano, T., Stetcu, I., Lestone, J. P., McKigney, E., Chadwick, M. B. |
| المصدر: | Phys. Rev. C 94, 064613 (2016) |
| سنة النشر: | 2016 |
| المجموعة: | Nuclear Experiment Nuclear Theory |
| مصطلحات موضوعية: | Nuclear Theory, Nuclear Experiment |
| الوصف: | The emission of prompt fission $\gamma$ rays within a few nanoseconds to a few microseconds following the scission point is studied in the Hauser-Feshbach formalism applied to the deexcitation of primary excited fission fragments. Neutron and $\gamma$-ray evaporations from fully accelerated fission fragments are calculated in competition at each stage of the decay, and the role of isomers in the fission products, before $\beta$-decay, is analyzed. The time evolution of the average total $\gamma$-ray energy, average total $\gamma$-ray multiplicity, and fragment-specific $\gamma$-ray spectra, is presented in the case of neutron-induced fission reactions of $^{235}$U and $^{239}$Pu, as well as spontaneous fission of $^{252}$Cf. The production of specific isomeric states is calculated and compared to available experimental data. About 7% of all prompt fission $\gamma$ rays are predicted to be emitted between 10 nsec and 5 $\mu$sec following fission, in the case of $^{235}$U and $^{239}$Pu $(n_{\rm th},f)$ reactions, and up to 3% in the case of $^{252}$Cf spontaneous fission. The cumulative average total $\gamma$-ray energy increases by 2 to 5% in the same time interval. Finally, those results are shown to be robust against significant changes in the model input parameters. Comment: 11 pages, 14 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevC.94.064613 |
| URL الوصول: | http://arxiv.org/abs/1607.00337 |
| رقم الأكسشن: | edsarx.1607.00337 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevC.94.064613 |
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