Total kinetic energy release in the fast-neutron-induced fission of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Np</mml:mi><mml:mprescripts /><mml:none /><mml:mn>237</mml:mn></mml:mmultiscripts></mml:math>

Pica, Ashley; Chemey, Alexander T.; Yao, L.; Loveland, W.; Lee, Hye Young; Kuvin, S. A.

doi:10.1103/physrevc.102.064612

Cited by 13 publications

(16 citation statements)

References 29 publications

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“…In this paper we describe the measurement of the TKE release in the fast neutron induced fission of 232 Th, 235 U and 237 Np. Some of these data have been published previously [1][2][3]. We comment on common features of these data and suggest directions for further research.…”

Section: Introductionmentioning

confidence: 60%

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Total kinetic energy release in the fast neutron induced fission of actinide nuclei

2021

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The total kinetic energy (TKE) release in the fast neutron-induced fission of various actinide nuclei was measured for neutron energies for En =2.6-100 MeV at the Weapons Neutron Research facility of the Los Alamos National Laboratory. The data are compared to the GEF model of the fission process. The variances of the TKE distributions appear to decrease with increasing Z and A of the fissioning systems.

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Section: Introductionmentioning

confidence: 60%

“…The experimental arrangements for these measurements have been described in detail in [1][2][3]. The measurements were made at the Los Alamos National Laboratory using the Weapons Neutron Research Facility (WNR) at the Los Alamos Neutron Science Center (LANSCE).…”

Section: Methodsmentioning

confidence: 99%

Total kinetic energy release in the fast neutron induced fission of actinide nuclei

2021

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“…Although the fission cross section of 237 Np has been measured over a wide range of incident neutron energies, little T KE data exists for 237 Np(n, f ) [4][5][6][7][9][10][11][12] and until recently [8], there was no T KE nor mass yield data for incident neutron energies above E n = 5.55 MeV (see figure 1). Due to the variety of the details of the previous studies, some specificity in unpacking and synthesizing the available information is necessary.…”

Section: Previous Measurementsmentioning

confidence: 99%

“…Previous studies of 237 Np(n, f ) have utilized one of two experimental techniques to measure T KE and fission mass yields. The most commonly employed technique was that of an evacuated scattering chamber containing a pair of solidstate silicon detectors (of varying type) mounted collinearly on opposite sides of a thin-backed 237 Np target with various neutron sources incident on the target [4][5][6][8][9][10][11][12][13]. The target was mounted at an oblique angle with respect to the incident neutron beam and the detectors were mounted at an oblique angle with respect to both the target and neutron beam.…”

Section: Previous Measurementsmentioning

confidence: 99%

“…Its presence in spent reactor fuel along with its 2.14 × 10 6 year half life and its nature as a fissionable material make a complete and precise understanding of its production and destruction desirable to inform reactor design, particularly that of fast reactors. Study of T KE vs E n data [4][5][6][7][8] in the range E n = 0 − 6.5 MeV. Data from references [9][10][11][12] excluded from this plot.…”

Section: Introductionmentioning

confidence: 99%

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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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