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Effects of the nuclear structure of fission fragments on the high-energy prompt fission $\gamma$-ray spectrum in $^{235}\mathrm{U}({n}_{\mathrm{th}},f)$

dc.contributor.authorMAKII, H.
dc.contributor.authorNISHIO, K.
dc.contributor.authorHIROSE, K.
dc.contributor.authorORLANDI, R.
dc.contributor.authorLÉGUILLON, R.
dc.contributor.authorOGAWA, T.
hal.structure.identifierInstitut Laue-Langevin [ILL]
dc.contributor.authorSOLDNER, T.
hal.structure.identifierInstitut Laue-Langevin [ILL]
dc.contributor.authorKÖSTER, U.
hal.structure.identifierInstitut Laue-Langevin [ILL]
dc.contributor.authorPOLLITT, A.
dc.contributor.authorHAMBSCH, F.J.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorTSEKHANOVICH, I.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorAÏCHE, M.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorCZAJKOWSKI, S.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorMATHIEU, L.
hal.structure.identifierCentre de Sciences Nucléaires et de Sciences de la Matière [CSNSM]
dc.contributor.authorPETRACHE, C.M.
hal.structure.identifierCentre de Sciences Nucléaires et de Sciences de la Matière [CSNSM]
dc.contributor.authorASTIER, A.
dc.contributor.authorGUO, S.
dc.contributor.authorOHTSUKI, T.
dc.contributor.authorSEKIMOTO, S.
dc.contributor.authorTAKAMIYA, K.
dc.contributor.authorFROST, R.J.W.
dc.contributor.authorKAWANO, T.
dc.date.issued2019
dc.description.abstractEnThe 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.
dc.language.isoen
dc.subject.enNuclear Reactions
dc.title.enEffects of the nuclear structure of fission fragments on the high-energy prompt fission $\gamma$-ray spectrum in $^{235}\mathrm{U}({n}_{\mathrm{th}},f)$
dc.typeArticle de revue
dc.identifier.doi10.1103/PhysRevC.100.044610
dc.subject.halPhysique [physics]/Physique Nucléaire Expérimentale [nucl-ex]
bordeaux.journalPhys.Rev.C
bordeaux.page044610
bordeaux.volume100
bordeaux.issue4
bordeaux.peerReviewedoui
hal.identifierhal-02383426
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02383426v1
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