Fragments' mass and energy characteristics in the spontaneous fission of 236Pu, 238Pu, 240Pu, 242Pu, and 244Pu

Dematte, L; Wagemans, C.; Barthelemy, Ramón S.; D’hondt, P.; Deruytter, A.J.

doi:10.1016/s0375-9474(97)00032-8

Cited by 76 publications

(46 citation statements)

References 15 publications

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“…Figure 3. Pre-neutron fission-fragment yield distribution from 236,240,242 Pu(sf) and 241 Pu(n th , f) in the heavy fragment mass region [20]. γ = 0.8 MeV, is well in agreement with all our other results, providing us with confidence in our new PFGS data for 240 Pu(sf) as well as in the underlying data analysis.…”

Section: Resultssupporting

confidence: 90%

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Prompt fissionγ-ray data from spontaneous fission and the mechanism of fission-fragment de-excitation

et al. 2017

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Abstract. The investigation of prompt γ -ray emission in nuclear fission has a great relevance for the assessment of prompt heat generation in a reactor core and for the better understanding of the de-excitation mechanism of fission fragments. Some years ago experimental data was scarce and available only from a few fission reactions, 233,235 U(n th , f), 239 Pu(n th , f), and 252 Cf(sf). Initiated by a high priority data request published by the OECD/NEA a dedicated prompt fission γ -ray measurement program is being conducted at the Joint Research Centre Geel. In recent years we obtained new and accurate prompt fission γ -ray spectrum (PFGS) characteristics (average number of photons per fission, average total energy per fission and mean photon energy) from 252 Cf(sf), 235 U(n th , f) and 239,241 Pu(n th , f) within 2% of uncertainty. In order to understand the dependence of prompt fission γ -ray emission on the compound nuclear mass and excitation energy, we started a first measurement campaign on spontaneously fissioning plutonium and curium isotopes. Results on PFGS characteristics from 240,242 Pu(sf) show a dependence on the fragment mass distribution rather than on the average prompt neutron multiplicity, pointing to a more complex competition between prompt fission γ -ray and neutron emission.

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Section: Resultssupporting

confidence: 90%

“…Systematic measurements of pre-neutron mass distributions from different spontaneously fissioning plutonium isotopes have revealed significant changes in fission fragment yield distribution as a function of neutron number of the compound nucleus [20]. Starting from 236 Pu, the maximum yield of heavy fragments, A h , is around 142 u (Fig.…”

Section: Resultsmentioning

confidence: 99%

Prompt fissionγ-ray data from spontaneous fission and the mechanism of fission-fragment de-excitation

et al. 2017

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“…6 with the experimental data whenever available [19]. Please note that these theoretical estimates were obtained with only two adjustable parameters d/R 0 = 0.15 and E 0 = 1 MeV.…”

Section: Collective Model Of Fissionmentioning

confidence: 71%

“…So, it is easy to map the yields from the (q 3 , q 4 ) onto the (TKE, A f h ) plane. The experimental data have a finite resolution in mass and in TKE, which in not negligible for the present cases [19]. Typical values are σ TKE =10 MeV and a variance of σ A f h =1.5 a.m.u.…”

Section: Collective Model Of Fissionmentioning

confidence: 72%

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Fission fragment mass and total kinetic energy distributions of spontaneously fissioning plutonium isotopes

Pomorski

Nerlo-Pomorska

Bartel³

et al. 2018

EPJ Web Conf.

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Abstract. The fission-fragment mass and total kinetic energy (TKE) distributions are evaluated in a quantum mechanical framework using elongation, mass asymmetry, neck degree of freedom as the relevant collective parameters in the Fourier shape parametrization recently developed by us. The potential energy surfaces (PES) are calculated within the macroscopic-microscopic model based on the Lublin-Strasbourg Drop (LSD), the Yukawa-folded (YF) single-particle potential and a monopole pairing force. The PES are presented and analysed in detail for even-even Plutonium isotopes with A = 236-246. They reveal deep asymmetric valleys. The fission-fragment mass and TKE distributions are obtained from the ground state of a collective Hamiltonian computed within the BornOppenheimer approximation, in the WKB approach by introducing a neck-dependent fission probability. The calculated mass and total kinetic energy distributions are found in good agreement with the data.

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Half-Lives for Proton Emission, Alpha Decay, Cluster Radioactivity, and Cold Fission Processes Calculated in a Unified Theoretical Framework

Duarte

Tavares

Guzmán

et al. 2002

Atomic Data and Nuclear Data Tables

121

116

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Fragments' mass and energy characteristics in the spontaneous fission of 236Pu, 238Pu, 240Pu, 242Pu, and 244Pu

Cited by 76 publications

References 15 publications

Prompt fissionγ-ray data from spontaneous fission and the mechanism of fission-fragment de-excitation

Prompt fissionγ-ray data from spontaneous fission and the mechanism of fission-fragment de-excitation

Fission fragment mass and total kinetic energy distributions of spontaneously fissioning plutonium isotopes

Half-Lives for Proton Emission, Alpha Decay, Cluster Radioactivity, and Cold Fission Processes Calculated in a Unified Theoretical Framework

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