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NSR database version of April 11, 2024.

Search: Author = S.Clarke

Found 26 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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

2001NI13      Phys.Rev. C64, 034313 (2001)

N.Nica, G.Duchene, V.E.Iacob, J.Dudek, F.A.Beck, Th.Byrski, D.Curien, G.de France, B.Haas, B.Kharraja, D.Prevost, C.Petrache, H.Savajols, J.P.Vivien, L.Han, K.Zuber, M.Aiche, M.M.Aleonard, J.F.Chemin, C.W.Beausang, S.Clarke, P.J.Dagnall, M.Smith, P.J.Twin, J.Simpson, M.A.Bentley

High-Spin States in 155Er

NUCLEAR REACTIONS 123Sb(37Cl, 5n), E=193 MeV; measured Eγ, Iγ, γγ-coin, γ-ray polarization. 155Er deduced high-spin levels, J, π, δ, configurations, deformation. Eurogam II array. Tilted-Fermi-surface analysis.

doi: 10.1103/PhysRevC.64.034313
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Data from this article have been entered in the XUNDL database. For more information, click here.

1998BE06      Phys.Lett. 417B, 13 (1998)

C.W.Beausang, P.Fallon, D.E.Appelbe, S.Asztalos, R.M.Clark, S.Clarke, B.Cederwall, M.A.Deleplanque, R.M.Diamond, S.Erturk, W.Kelly, I.Y.Lee, A.O.Macchiavelli, D.C.Patterson, M.B.Smith, F.S.Stephens, P.J.Twin, A.N.Wilson

Lifetimes of Yrast and Excited Superdeformed State in 150Gd: Effect of particle-hole excitations on the deformation

NUCLEAR REACTIONS 130Te(26Mg, 6n), E=149 MeV; measured Eγ, Iγ, γγ-coin, DSA. 150Gd deduced high-spin levels, superdeformed bands T1/2, quadrupole moments, configurations.

doi: 10.1016/S0370-2693(97)01347-6
Citations: PlumX Metrics

1995BE20      J.Phys.(London) G21, L21 (1995)

M.A.Bentley, C.W.Beausang, P.J.Twin, P.J.Dagnall, A.Atac, F.A.Beck, Th.Byrski, S.Clarke, D.M.Curien, G.Duchene, G.de France, P.D.Forsyth, B.Herskind, B.Haas, J.C.Lisle, B.M.Nyako, J.Nyberg, E.S.Paul, J.Simpson, J.Styczen, J.P.Vivien, K.Zuber

Search for Linking Transitions between the Superdeformed and Normal Deformed States in 152Dy

NUCLEAR REACTIONS 108Pd(48Ca, 4n), E=200 MeV; measured γγγ-coin, Eγ, Iγ. 152Dy deduced superdeformed, normal deformed high-spin states linking transitions evidence.

doi: 10.1088/0954-3899/21/4/001
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1995FA09      Phys.Rev. C52, 93 (1995)

P.Fallon, C.W.Beausang, S.Asztalos, D.Nisius, R.V.F.Janssens, M.Bergstrom, M.Carpenter, B.Cederwall, S.Clarke, B.Crowell, M.A.Deleplanque, R.M.Diamond, R.G.Henry, T.L.Khoo, T.Lauritsen, I.Y.Lee, A.O.Macchiavelli, F.S.Stephens, P.J.Twin

Proton and Neutron Excitations in Superdeformed 150Tb

NUCLEAR REACTIONS 124Sn(31P, 5n), E=167 MeV; measured Eγ-Eγ-coin. 150Tb deduced levels, J, π, superdeformed bands.

doi: 10.1103/PhysRevC.52.93
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1995GA13      J.Phys.(London) G21, 193 (1995)

S.J.Gale, J.Simpson, M.A.Riley, J.F.Sharpey-Schafer, E.S.Paul, M.A.Bentley, A.M.Bruce, R.Chapman, R.M.Clark, S.Clarke, J.Copnell, D.M.Cullen, P.Fallon, A.Fitzpatrick, P.D.Forsyth, S.J.Freeman, P.M.Jones, M.J.Joyce, F.Liden, J.C.Lisle, A.O.Macchiavelli, A.G.Smith, J.F.Smith, J.Sweeney, D.M.Thompson, S.Warburton, J.N.Wilson, I.Ragnarsson

Band Termination Spectroscopy in 157Er

NUCLEAR REACTIONS 114Cd(48Ca, 5n), E=210 MeV; measured γγγ-, γγγγ-coin, Eγ, Iγ, γγ(θ). 157Er deduced high-spin levels, transition energies, Iγ, J, π. Enriched targets, EUROGAM array of escape suppressed spectrometers (Ge and BGO detectors). Cranked-shell model, cranked Nilsson-Strutinsky calculations, band terminating states.

1994CL01      Phys.Rev. C50, 84 (1994)

R.M.Clark, R.Wadsworth, H.R.Andrews, C.W.Beausang, M.Bergstrom, S.Clarke, E.Dragulescu, T.Drake, P.J.Dagnall, A.Galindo-Uribarri, G.Hackman, K.Hauschild, I.M.Hibbert, V.P.Janzen, P.M.Jones, R.W.MacLeod, S.M.Mullins, E.S.Paul, D.C.Radford, A.Semple, J.F.Sharpey-Schafer, J.Simpson, D.Ward, G.Zwartz

Recoil Distance Lifetime Measurements of States in the Oblate Dipole Bands of 197,198Pb

NUCLEAR REACTIONS 176Yb(26Mg, xn), E=125 MeV; 186W(18O, xn), E=113 MeV; measured γγ-coin, DSA, Eγ. 197,198Pb deduced high-spin levels B(λ), T1/2, quadrupole moments, γ-branching ratio. Donau-Frauendorf model, tilted axis cranking model. Enriched targets, Ge detection, BGO suppression shields.

doi: 10.1103/PhysRevC.50.84
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1994CL02      Phys.Rev. C50, 1222 (1994)

R.M.Clark, R.Wadsworth, K.Hauschild, I.M.Hibbert, E.Dragulescu, C.W.Beausang, M.H.Bergstrom, S.Clarke, P.J.Dagnall, P.M.Jones, E.S.Paul, A.T.Semple, J.F.Sharpey-Schafer, J.Simpson, W.Satula, R.Wyss

Superdeformation in the Pb Nuclei and the Evolution of the Dynamic Moments of Inertia

NUCLEAR REACTIONS 186W(18O, xn), E=113 MeV; measured Eγ, Iγ, γγ-coin. 194,196,198Pb deduced superdeformed band features, dynamic moments of inertia. Comparison with cranked Woods-Saxon calculations. Enriched targets, hyperpure Ge detectors, BGO suppression shields.

doi: 10.1103/PhysRevC.50.1222
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1994DA20      Phys.Lett. 335B, 313 (1994)

P.J.Dagnall, C.W.Beausang, P.J.Twin, M.A.Bentley, F.A.Beck, Th.Byrski, S.Clarke, D.Curien, G.Duchene, G.de France, P.D.Forsyth, B.Haas, J.C.Lisle, E.S.Paul, J.Simpson, J.Styczen, J.P.Vivien, J.N.Wilson, K.Zuber

Excited Bands in the Doubly-Magic Superdeformed 152Dy Nucleus: Evidence for the first N = 7 proton hyper-intruder orbital

NUCLEAR REACTIONS 108Pd(48Ca, 4n), E=200 MeV; measured γγ-coin, Eγ, Iγ. 152Dy deduced high-spin levels, J, π, superdeformed bands, configurations.

doi: 10.1016/0370-2693(94)90356-5
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1994DE33      Phys.Lett. 331B, 290 (1994)

G.de France, B.Haas, I.Ragnarsson, P.J.Twin, C.W.Beausang, F.A.Beck, T.Byrski, S.Clarke, D.Curien, P.J.Dagnall, G.Duchene, P.Fallon, S.Flibotte, S.Forbes, P.D.Forsyth, B.Kharraja, J.C.Lisle, J.C.Merdinger, C.M.Petrache, D.Prevost, J.F.Sharpey-Schafer, J.Simpson, J.P.Vivien, K.Zuber

Neutron Excitations Across the N = 86 Superdeformed Shell Gap

NUCLEAR STRUCTURE 149Gd, 152,151Tb, 152Dy; analyzed Eγ data; deduced superdeformed high-spin bands features.

doi: 10.1016/0370-2693(94)91054-5
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1994FA13      Phys.Rev.Lett. 73, 782 (1994)

P.Fallon, C.W.Beausang, S.Clarke, P.J.Twin, F.A.Beck, Th.Byrski, D.Curien, P.J.Dagnall, G.de France, G.Duchene, P.D.Forsyth, B.Haas, M.J.Joyce, A.O.Macchiavelli, E.S.Paul, J.F.Sharpey-Schafer, J.Simpson, J.P.Vivien, S.Aberg, W.Nazarewicz

Pair Excitaions and a Proton Band Crossing in Superdeformed 150Gd

NUCLEAR REACTIONS 130Te(26Mg, 6n), E=149 MeV; measured γγ-coin. 150Gd deduced superdeformed high-spin band, configuration, dynamic moments of inertia, relative Iγ.

doi: 10.1103/PhysRevLett.73.782
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1994SI10      Phys.Lett. 327B, 187 (1994)

J.Simpson, M.A.Riley, S.J.Gale, J.F.Sharpey-Schafer, M.A.Bentley, A.M.Bruce, R.Chapman, R.M.Clark, S.Clarke, J.Copnell, D.M.Cullen, P.Fallon, A.Fitzpatrick, P.D.Forsyth, S.J.Freeman, P.M.Jones, M.J.Joyce, F.Linden, J.C.Lisle, A.O.Macchiavelli, A.G.Smith, J.F.Smith, J.Sweeney, D.M.Thompson, S.Warburton, J.N.Wilson, T.Bengtsson, I.Ragnarsson

Single Particle Excitations and Properties of Multiple Band Terminations Near Spin 50(h-bar) in 158Er

NUCLEAR REACTIONS 114Cd(48Ca, 4n), E=210 MeV; measured γγ-coin. 158Er deduced levels, J, π, band structure, configuration. Cranked Nilsson-Strutinsky calculations.

doi: 10.1016/0370-2693(94)90716-1
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1994VA15      Phys.Rev. C50, 104 (1994)

P.Vaska, S.Bhattacharjee, D.B.Fossan, D.R.LaFosse, Y.Liang, H.Schnare, K.Starosta, M.P.Waring, I.Hibbert, R.Wadsworth, K.Hauschild, C.W.Beausang, S.Clarke, S.A.Forbes, P.J.Nolan, E.S.Paul, A.T.Semple, S.M.Mullins, H.Grawe, K.H.Maier

Neutron i13/2 Intruder Band in 139Sm

NUCLEAR REACTIONS 110Pd(34S, 5n), E=159 MeV; measured γγ-coin. 139Sm deduced high-spin levels, J, π, deformation parameters.

NUCLEAR STRUCTURE 139,137Sm, 141,139Gd; analyzed data; deduced dynamic moment of inertia, deformation parameters. Total Routhian surface, cranked shell model calculations.

doi: 10.1103/PhysRevC.50.104
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1993BE37      Phys.Rev.Lett. 71, 1800 (1993)

C.W.Beausang, P.Fallon, S.Clarke, F.A.Beck, Th.Byrski, D.Curien, P.J.Dagnall, G.de France, G.Duchene, P.D.Forsyth, B.Haas, M.J.Joyce, A.O.Macchiavelli, E.S.Paul, J.F.Sharpey-Schafer, J.Simpson, P.J.Twin, J.P.Vivien

Degnerate Superdeformed States in 150Gd

NUCLEAR REACTIONS 130Te(26Mg, 6n), E=149 MeV; measured γγγ-coin. 150Gd deduced levels, J, π, superdeformed state degeneracy features.

doi: 10.1103/PhysRevLett.71.1800
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Note: The following list of authors and aliases matches the search parameter S.Clarke: , S.D.CLARKE