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NSR database version of April 11, 2024.

Search: Author = S.D.Clarke

Found 13 matches.

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2023GI01      Phys.Rev. C 107, 014612 (2023)

N.P.Giha, S.Marin, J.A.Baker, I.E.Hernandez, K.J.Kelly, M.Devlin, J.M.O'Donnell, R.Vogt, J.Randrup, P.Talou, I.Stetcu, A.E.Lovell, O.Litaize, O.Serot, A.Chebboubi, C.-Y.Wu, S.D.Clarke, S.A.Pozzi

Correlations between energy and γ-ray emission in 239Pu(n, f)

NUCLEAR REACTIONS 239Pu(n, f), E=2-40 MeV; measured fragments, En, In, Eγ, Iγ, (fragments)γ-coin, (fragment)n-coin, nγ-coin; deduced γ spectrum, γ multiplicity, linear relation between incident neutron energy and γ multiplicity. Comparison to fission model calculations done with CGMF, FIFRELIN and FREYA codes. Multiplicity results are compared to ENDF/B-VIII.0 data and to experimental data on 238U(n, F), 239Pu(d, F), 233Pu(d, F), 240Pu(d, F) reactions. Broad-spectrum neutron beam produced via spallation reaction of an 800 MeV proton beam on W target (Los Alamos Neutron Science Center). Chi-Nu liquid scintillator array, a hemispherical array of 54 EJ-309 (n- and γ- measurement) surrounding multifoil parallel-plate avalanche counter (PPAC) serving as target and contain ing 239Pu (fragment measurement).

doi: 10.1103/PhysRevC.107.014612
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2022MA26      Phys.Rev. C 105, 054609 (2022)

S.Marin, E.P.Sansevero, M.S.Okar, I.E.Hernandez, R.Vogt, J.Randrup, S.D.Clarke, V.A.Protopopescu, S.A.Pozzi

Directional dependence of the event-by-event neutron-γ multiplicity correlations in 252Cf(sf)

RADIOACTIVITY 252Cf(SF); analyzed Eg and En data collected at the Chi-Nu array at the Los Alamos Neutron Science Center with considering the angle between the emitted particles in addition to their individual energies; deduced nγ-correlations, enhancement of γ-emission around 0.7 and 1.2 MeV, directional alignment for Eγ below 0.7 MeV, correlation between fragment excitation energies and angular momentum. Comparison with model calculations.

doi: 10.1103/PhysRevC.105.054609
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2021HU09      Ann.Nucl.Energy 155, 108082 (2021)

M.Y.Hua, J.D.Hutchinson, G.E.McKenzie, S.D.Clarke, S.A.Pozzi

On the Feynman-alpha method for reflected fissile assemblies

RADIOACTIVITY 252Cf(SF); measured decay products, En, In, Ep, Ip; deduced prompt neutron periods values for the Feynman-alpha, Rossi-alpha. Comparison with simulations.

doi: 10.1016/j.anucene.2020.108082
Citations: PlumX Metrics

2021MA54      Phys.Rev. C 104, 024602 (2021)

S.Marin, M.S.Okar, E.P.Sansevero, I.E.Hernandez, C.A.Ballard, R.Vogt, J.Randrup, P.Talou, A.E.Lovell, I.Stetcu, O.Serot, O.Litaize, A.Chebboubi, S.D.Clarke, V.A.Protopopescu, S.A.Pozzi

Structure in the event-by-event energy-dependent neutron-γ multiplicity correlations in 252Cf(sf)

RADIOACTIVITY 252Cf(SF); analyzed Eγ and E(n) data collected at the Chi-Nu array at the Los Alamos Neutron Science Center with the application of the normalized differential multiplicity covariances; deduced neutron-γ correlations, evidence for enhancements in neutron-γ correlations around Eγ=0.7 and 1.2 MeV. Comparison with model calculations. Relevance to disagreement in the literature about correlations between neutron-γ competition and fragment properties.

doi: 10.1103/PhysRevC.104.024602
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2020HU11      Ann.Nucl.Energy 147, 107672 (2020)

M.Y.Hua, J.D.Hutchinson, G.E.McKenzie, B.C.Kiedrowski, M.W.Liemohn, S.D.Clarke, S.A.Pozzi

Measurement uncertainty of rossi-alpha neutron experiments

doi: 10.1016/j.anucene.2020.107672
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2020MA20      Nucl.Instrum.Methods Phys.Res. A968, 163807 (2020)

S.Marin, V.A.Protopopescu, R.Vogt, M.J.Marcath, S.Okar, M.Hua, P.Talou, P.F.Schuster, S.D.Clarke, S.A.Pozzi

Event-by-event neutron-photon multiplicity correlations in 252Cf(sf)

RADIOACTIVITY 252Cf(SF); analyzed available data using unfolding techniques in comparison with predictions of model-based calculations; deduced a significant event-by-event neutron-photon emission competition following the spontaneous fission of 252Cf.

doi: 10.1016/j.nima.2020.163907
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2019SC12      Phys.Rev. C 100, 014605 (2019)

P.F.Schuster, M.J.Marcath, S.Marin, S.D.Clarke, M.Devlin, R.C.Haight, R.Vogt, P.Talou, I.Stetcu, T.Kawano, J.Randrup, S.A.Pozzi

High resolution measurement of tagged two-neutron energy and angle correlations in 252Cf (sf)

RADIOACTIVITY 252Cf(SF); measured prompt neutron time of flight, angular distribution of neutrons, nn-coin, prompt neutron emission anisotropy, correlations in angle and energy between prompt neutrons emitted in spontaneous fission using fission chamber and the Chi-Nu liquid scintillator detector array at LANSCE-LANL facility. Comparison with simulations produced by the fission event generators CGMF, FREYA, and MCNPX-POLIMI IPOL(1)=1.

doi: 10.1103/PhysRevC.100.014605
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14574.

2018MA25      Phys.Rev. C 97, 044622 (2018)

M.J.Marcath, R.C.Haight, R.Vogt, M.Devlin, P.Talou, I.Stetcu, J.Randrup, P.F.Schuster, S.D.Clarke, S.A.Pozzi

Measured and simulated 252Cf(sf) prompt neutron-photon competition

RADIOACTIVITY 252Cf(SF); measured Eγ, Iγ, E(n), I(n), nγ-coin, time of flight distributions for neutrons and photons, event-by-event neutron-photon correlation using Chi-Nu liquid scintillator array of 45 liquid organic scintillation detectors and a fission chamber at LANL; deduced neutron and photon multiplicities. Comparison with MCPNX-PoliMi simulation with CGMF and FREYA models.

doi: 10.1103/PhysRevC.97.044622
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2018TA05      Eur.Phys.J. A 54, 9 (2018)

P.Talou, R.Vogt, J.Randrup, M.E.Rising, S.A.Pozzi, J.Verbeke, M.T.Andrews, S.D.Clarke, P.Jaffke, M.Jandel, T.Kawano, M.J.Marcath, K.Meierbachtol, L.Nakae, G.Rusev, A.Sood, I.Stetcu, C.Walker

Correlated prompt fission data in transport simulations

COMPILATION 235U, 239Pu(n, F), E=thermal;252Cf(SF); compiled average prompt fission neutron multiplicity vs fragment mass, prompt fission neutron σ(En), γ-decay energy spectrum σ(Eγ), γ multiplicity, n-n angular correlation. Calculated σ, yields using FREYA and CGMF codes. Compared with data.

doi: 10.1140/epja/i2018-12455-0
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2017CL01      Phys.Rev. C 95, 064612 (2017)

S.D.Clarke, B.M.Wieger, A.Enqvist, R.Vogt, J.Randrup, R.C.Haight, H.Y.Lee, B.A.Perdue, E.Kwan, C.Y.Wu, R.A.Henderson, S.A.Pozzi

Measurement of the energy and multiplicity distributions of neutrons from the photofission of 235U

NUCLEAR REACTIONS 235U(γ, F), E<800 MeV white photon source; measured E(n), I(n), neutron time-of-flight spectrum, prompt fission neutron spectrum, neutron multiplicity distribution, average energy of correlated photofission neutron pairs as function of the angle between detectors at the WNR-15L beam line at LANSCE-LANL. Comparison with simulations using FREYA and MCNPX-POLIMI codes.

doi: 10.1103/PhysRevC.95.064612
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetL0224.

2014PO07      Nucl.Sci.Eng. 178, 250 (2014)

S.A.Pozzi, B.Wieger, A.Enqvist, S.D.Clarke, M.Flaska, M.Marcath, E.Larsen, R.C.Haight, E.Padovani

Correlated Neutron Emissions from 252Cf

RADIOACTIVITY 252Cf(SF); measured decay products, En, In, Eγ, Iγ, n-n-γ-coin; deduced yields for gamma-neutron-neutron correlated events, average energy of neutron-neutron events. Comparison with MCNPX calculations.

doi: 10.13182/NSE13-96
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14405.

2009CL02      Nucl.Instrum.Methods Phys.Res. A604, 618 (2009)

S.D.Clarke, M.Flaska, S.A.Pozzi, P.Peerani

Neutron and gamma-ray cross-correlation measurements of plutonium oxide powder

RADIOACTIVITY Pu(SF); measured Eγ, Iγ, neutron spectra, nγ-, nn-coin; deduced time dependent cross correlation functions. PuO2 sample. Compared results to MCNP-PoliMi simulation.

doi: 10.1016/j.nima.2009.02.045
Citations: PlumX Metrics

2008CL03      Nucl.Sci.Eng. 160, 370 (2008)

S.D.Clarke, S.A.Pozzi, E.Padovani, T.J.Downar

Sensitivity of Photoneutron Production to Perturbations in Cross-Section Data

NUCLEAR REACTIONS 238U(γ, n), (γ, 2n), (γ, f), E < 20 MeV; calculated photoneutron production using the ENDF/B-VII library. Sensitivity study.

doi: 10.13182/NSE160-370
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