Fission fragment mass yields and total kinetic energy release in neutron-induced fission of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">U</mml:mi><mml:mprescripts /><mml:none /><mml:mn>233</mml:mn></mml:mmultiscripts></mml:math>
 from thermal energies to 40 MeV

Higgins, Dan; Greife, U.; Tôvesson, F.; Manning, B.; Mayorov, D.; Mosby, S.; Schmitt, K. T.

doi:10.1103/physrevc.101.014601

Cited by 23 publications

(9 citation statements)

References 17 publications

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“…In Figure 4, we show our data, as well as comparisons to other 237 Np (n,f) reaction data and the GEF model. The overall trend of decreasing TKE with increasing excitation is consistent with other fast neutron TKE studies of actinides [17][18][19][20][21][22][23][24][25][26]. While the TKE release for the lowest energy neutrons is approximately linear, a first order log 10 (En) polynomial fit is needed to describe the fast neutron energy region (En> 1 MeV).…”

Section: A Tke Vs Ensupporting

confidence: 86%

Total kinetic energy release in the fast neutron-induced fission of 237Np

Pica,

Chemey,

Yao

et al. 2020

Preprint

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The total kinetic energy (TKE) in the fast neutron induced fission of 237 Np was measured for neutron energies from n = 2.6 -100 MeV at the LANSCE-WNR facility. The post TKE release decreases non-linearly with increasing incident neutron energy and can be represented as T KE(M eV ) = (174.38 ± 0.72) − (5.11 ± 0.5821) log 10 En for En > 1 MeV. Analysis of the fragment mass distributions indicates that the decrease in TKE with increasing En is a consequence of two factors; shell effects fade out at high excitation energies, resulting in the increasing occurrence of symmetric fission, and TKEasym decreases rapidly at high En.

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Section: A Tke Vs Ensupporting

confidence: 86%

Total kinetic energy release in the fast neutron-induced fission of 237Np

Pica,

Chemey,

Yao

et al. 2020

Preprint

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“…In this figure we show our data, the GEF model [20], and the 240,242 Pu(n,f) data measured by Vorob'eva et al [16,38]. The overall trend of decreasing TKE with increasing excitation is consistent with other fast neutron TKE studies of actinides [7,9,[13][14][15]39]. A second order log 10 polynomial fit best describes the TKE vs. E n relationship.…”

Section: Comparison With Gef and Cgmfsupporting

confidence: 85%

The fast neutron induced fission of $^{240}$Pu and $^{242}$Pu

Pica¹,

Chemey²,

Loveland³

2022

Preprint

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We report the measurement of the TKE release in the fast neutron induced fission of 240 Pu and 242 Pu. The results are compared to the predictions of the GEF model, the CGMF model, and the model of Denisov and Sedykh as well as previous experimental work on these reactions. Our absolute measurements of the TKE release are in good agreement with the previous measurements of Nethaway et al. for the interaction of 14.8 MeV neutrons with 240 Pu [1] and of Winkelmann and Aumann for the interaction of 15 MeV neutrons with 242 Pu [2]. The general trends of the measured TKE values agree with phenomenological models but the variances of the TKE distributions are significantly less than predicted by various models. The mean post neutron emission TKE release decreases non-linearly with increasing neutron energy and can be represented as TKE(MeV) = 175.8 ± 0.3 -(2. 4 ± 0.8)log10En -(1.4 ±0.4)log10E 2 n for 240 Pu and TKE(MeV) = 177.1 ± 0.3 -(1.2 ± 0.9)log10En -(1.8 ±0.5)log10E 2 n for 242 Pu.

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“…It has a high efficiency, covering a solid angle of nearly 4π sr as well as superior energy resolution, typically in the range of ∼ 0.5 − 1 MeV for fission fragments [27]. TFGIC detectors have been used in many double-energy style measurements in the past [7,[28][29][30][31][32][33].…”

Section: B Detector and Daqmentioning

confidence: 99%

“…Energy calibration of the anode pulse height spectra was achieved using the method described in references [33,43]. The centroids of the light and heavy peaks in each anode pulse height spectrum for a subset of events with E n ≤ 1 MeV were normalized to the absolute values of E i reported by Naqvi et al at an incident neutron energy of E n = 0.8 MeV [5] reduced by the requisite PHD of the TFGIC for the mean post-neutron evaporation mass.…”

Section: Energy Calibrationmentioning

confidence: 99%

Properties of correlated fission fragments from neutron induced fission of Np-237 at incident neutron energies between 200 keV and 100 MeV

Connolly¹,

Montoya²,

Duke³

et al. 2021

Preprint

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Background: Measurements of the neutron-induced fission of major actinides are vital to applications such as nuclear energy, nuclear forensics, nuclear nonproliferation and stockpile stewardship. Contemporary fission models are informed by additional correlated fission data, advancing toward a fully predictive fission model. Of particular interest are the average total kinetic energy ( T KE ) of the fission fragments, fission fragment mass yield distributions and correlations between mass and T KE as they evolve with excitation energy of the fissioning system. Neptunium-237 is produced in significant quantities in the nuclear fuel cycle. Its presence in spent reactor fuel and ∼ 2 × 10 6 year half life make a complete and precise understanding of its production and destruction desirable to inform reactor design. Little T KE data exists for 237 Np(n, f ), and until recently, there was no T KE nor mass yield data for 237 Np(n, f ) at incident neutron energies above E n = 5.55 MeV. The most recent measurement suffered from low statistics and relatively poor energy resolution compared to previous studies, so a higher quality data set is desired.Purpose: This study aimed to measure post-neutron evaporation mass yields and average total kinetic energy release of correlated fission products from neutron-induced fission of 237 Np over a wide range of incident neutron energies (particularly incident neutron energies above E n = 5.55 MeV), as well as to analyze how these quantities evolve with incident neutron energy. Method:The aforementioned measurements were obtained using a twin Frisch-gridded ionization chamber (TFGIC) and a thin-backed 237 Np target at the Los Alamos Neutron Science Center -Weapons Neutron Research (LANSCE -WNR) facility, which provides a collimated beam of neutrons with energies ranging from 100s of keV to 100s of MeV. The data were analyzed using the double-energy (or 2E) method, with mass-dependant corrections for prompt-fission neutrons and pulse height defect.Results: A total of 1.15 × 10 6 coincident fission events were recorded and analyzed using the 2E method. Preand post-neutron evaporation T KE values are reported for 54 incident neutron energies in the energy range 0.20 ≤ E n ≤ 100.0 MeV and compared to existing data and models. Pre-and post-neutron evaporation mass yields were extracted with a full width at half maximum (FWHM) resolution of approximately 4u and compared to existing data and evaluations. Conclusions:The present T KE and mass yield data agree with previous results and also with statistical models of 237 Np(n, f ) at incident neutron energies between E n = 0.2 − 20.0 MeV. A flattening of the T KE data is observed (relative to the GEF model's prediction) above E n = 20.0 MeV. However, the interpretation of this discrepancy is unclear as the analysis method's neglect of incomplete momentum transfer at high energies as well as pre-equilibrium pre-fission phenomena likely have a significant impact on the measurement at such high incident neutron energies.

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Fission fragment mass yields and total kinetic energy release in neutron-induced fission of U233 from thermal energies to 40 MeV

Cited by 23 publications

References 17 publications

Total kinetic energy release in the fast neutron-induced fission of 237Np

Total kinetic energy release in the fast neutron-induced fission of 237Np

The fast neutron induced fission of $^{240}$Pu and $^{242}$Pu

Properties of correlated fission fragments from neutron induced fission of Np-237 at incident neutron energies between 200 keV and 100 MeV

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