NSR Query Results
Output year order : Descending NSR database version of April 26, 2024. Search: Author = S.Clarke Found 26 matches. 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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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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