Back to Search
Start Over
Effects of the nuclear structure of fission fragments on the high-energy prompt fission γ -ray spectrum in U235(nth,f)
- Source :
- Physical Review C. 100
- Publication Year :
- 2019
- Publisher :
- American Physical Society (APS), 2019.
-
Abstract
- 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 :
- Physics
Nuclear reaction
Range (particle radiation)
010308 nuclear & particles physics
Fission
Astrophysics::High Energy Astrophysical Phenomena
Spectrum (functional analysis)
Nuclear structure
7. Clean energy
01 natural sciences
Spectral line
Nuclear physics
0103 physical sciences
Nuclide
Nuclear Experiment
010306 general physics
Excitation
Subjects
Details
- ISSN :
- 24699993 and 24699985
- Volume :
- 100
- Database :
- OpenAIRE
- Journal :
- Physical Review C
- Accession number :
- edsair.doi...........2d14841d2eab2f1035e8290ee6e41852