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Effects of the nuclear structure of fission fragments on the high-energy prompt fission $\gamma$-ray spectrum in $^{235}\mathrm{U}({n}_{\mathrm{th}},f)$
- Source :
- Phys.Rev.C, Phys.Rev.C, 2019, 100 (4), pp.044610. ⟨10.1103/PhysRevC.100.044610⟩, Physical Review C, Physical Review C, American Physical Society, 2019, 100 (4), pp.044610. ⟨10.1103/PhysRevC.100.044610⟩
- Publication Year :
- 2019
- Publisher :
- HAL CCSD, 2019.
-
Abstract
- International audience; The prompt fission γ-ray energy spectrum for cold-neutron-induced fission of U235 was measured in the energy range Eγ=0.8–20MeV, by gaining a factor of about 105 in statistics compared to the measurements performed so far. The spectrum exhibits local bump structures at Eγ≈4MeV and ≈6MeV, and also a broad one at ≈15MeV. In order to understand the origins of these bumps, the γ-ray spectra were calculated using a statistical Hauser-Feshbach model, taking into account the deexcitation of all the possible primary fission fragments. It is shown that the bump at ≈4MeV is created by the transitions between the discrete levels in the fragments around Sn132, and the bump at ≈6MeV mostly comes from the complementary light fragments. It is also indicated that a limited number of nuclides, which have high-spin states at low excitation energies, can contribute to the bump structure around Eγ≈15MeV, induced by the transition feeding into the low-lying high-spin states.
- Subjects :
- Nuclear Reactions
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Subjects
Details
- Language :
- English
- ISSN :
- 24699985 and 24699993
- Database :
- OpenAIRE
- Journal :
- Phys.Rev.C, Phys.Rev.C, 2019, 100 (4), pp.044610. ⟨10.1103/PhysRevC.100.044610⟩, Physical Review C, Physical Review C, American Physical Society, 2019, 100 (4), pp.044610. ⟨10.1103/PhysRevC.100.044610⟩
- Accession number :
- edsair.dedup.wf.001..dc1e418c4d48af6eaeb9a395093a4c4e