NSR Query Results
Output year order : Descending NSR database version of April 26, 2024. Search: Author = W.Ryssens Found 21 matches. 2024DA05 Phys.Rev. C 109, 034316 (2024) Ph.Da Costa, K.Bennaceur, J.Meyer, W.Ryssens, M.Bender Impact of choices for center-of-mass correction energy on the surface energy of Skyrme energy density functionals
doi: 10.1103/PhysRevC.109.034316
2023GR08 Eur.Phys.J. A 59, 270 (2023) G.Grams, W.Ryssens, G.Scamps, S.Goriely, N.Chamel Skyrme-Hartree-Fock-Bogoliubov mass models on a 3D mesh: III. From atomic nuclei to neutron stars
doi: 10.1140/epja/s10050-023-01158-6
2023HU01 Phys.Rev. C 107, 014306 (2023) M.Hukkanen, W.Ryssens, P.Ascher, M.Bender, T.Eronen, S.Grevy, A.Kankainen, M.Stryjczyk, L.Al Ayoubi, S.Ayet, O.Beliuskina, C.Delafosse, W.Gins, M.Gerbaux, A.Husson, A.Jokinen, D.A.Nesterenko, I.Pohjalainen, M.Reponen, S.Rinta-Antila, A.de Roubin, A.P.Weaver Odd-odd neutron-rich rhodium isotopes studied with the double Penning trap JYFLTRAP ATOMIC MASSES 110,110m,112,112m,114,114m,116,116m,118,118m,120Rh; measured cyclotron frequency; deduced mass excess. 112Rh; calculated potential energy surfaces, singe particle neutron and proton states. Systematics of deformation parameter, triaxiality angle and neutron gaps for Ru, Rh and Pd isotopes. Comparison to AME2020, other experimental data and to theoretical predictions using the BSkG1 mass model. Phase-imaging ion-cyclotron-resonance (PI-ICR) technique. Isotopes produced in U(p, F), E=25 MeV at K-130 cyclotron. JYFLTRAP Penning trap mass spectrometer at the Ion Guide Isotope Separator On-Line (IGISOL) facility. RADIOACTIVITY 112,112mRh(β-)[from U(p, F), E=25 MeV]; measured Iβ; deduced T1/2. 112Rh; deduced the correct placement of ground and isomeric state and assigned J, π accordingly. Silicon detector placed after the JYFLTRAP Penning trap at IGISOL.
doi: 10.1103/PhysRevC.107.014306
2023HU25 Phys.Rev. C 108, 064315 (2023) M.Hukkanen, W.Ryssens, P.Ascher, M.Bender, T.Eronen, S.Grevy, A.Kankainen, M.Stryjczyk, L.Al Ayoubi, S.Ayet, O.Beliuskina, C.Delafosse, Z.Ge, M.Gerbaux, W.Gins, A.Husson, A.Jaries, S.Kujanpaa, M.Mougeot, D.A.Nesterenko, S.Nikas, H.Penttila, I.Pohjalainen, A.Raggio, M.Reponen, S.Rinta-Antila, A.de Roubin, J.Ruotsalainen, V.Virtanen, A.P.Weaver Binding energies of ground and isomeric states in neutron-rich ruthenium isotopes: Measurements at JYFLTRAP and comparison to theory
doi: 10.1103/PhysRevC.108.064315
2023RY01 Phys.Rev.Lett. 130, 212302 (2023) W.Ryssens, G.Giacalone, B.Schenke, C.Shen Evidence of Hexadecapole Deformation in Uranium-238 at the Relativistic Heavy Ion Collider NUCLEAR REACTIONS 238U(238U, X), E not given; analyzed available data; deduced ratio of mean squared elliptic flow coefficients, deformation parameters, B(Eλ). The BNL Relativistic Heavy Ion Collider (RHIC).
doi: 10.1103/PhysRevLett.130.212302
2023RY02 Eur.Phys.J. A 59, 96 (2023) W.Ryssens, G.Scamps, S.Goriely, M.Bender Skyrme-Hartree-Fock-Bogoliubov mass models on a 3D mesh: IIb. Fission properties of BSkG2 NUCLEAR STRUCTURE 232,234,236,238U, 238,240,242,244Pu, 242,244,246,248Cm; analyzed available data; deduced fission barriers, potential energy surfaces as a function of quadrupole deformation, the effect of the rotational and vibrational correction, effect of triaxial deformation on the inner fission barrier. New BSkG2 model based on an energy density functional of the Skyrme type.
doi: 10.1140/epja/s10050-023-01002-x
2022RY02 Eur.Phys.J. A 58, 246 (2022) W.Ryssens, G.Scamps, S.Goriely, M.Bender Skyrme-Hartree-Fock-Bogoliubov mass models on a 3D mesh: II. Time-reversal symmetry breaking NUCLEAR STRUCTURE N<160; calculated difference of masses with the Skyrme-based BSkG2 model whose parameters were adjusted to essentially all known nuclear masses without relying on the Equal Filling Approximation (EFA) and AME 20270; deduced model parameters.
doi: 10.1140/epja/s10050-022-00894-5
2021GU12 Phys.Lett. B 816, 136206 (2021) M.Guttormsen, Y.Alhassid, W.Ryssens, K.O.Ay, M.Ozgur, E.Algin, A.C.Larsen, F.L.Bello Garrote, L.Crespo Campo, T.Dahl-Jacobsen, A.Gorgen, T.W.Hagen, V.W.Ingeberg, B.V.Kheswa, M.Klintefjord, J.E.Midtbo, V.Modamio, T.Renstrom, E.Sahin, S.Siem, G.M.Tveten, F.Zeiser Strong enhancement of level densities in the crossover from spherical to deformed neodymium isotopes NUCLEAR REACTIONS 142,144,146,148,150Nd(p, X), E=16 MeV; 142,144,146,148,150Nd(α, X), E=13.5 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, nuclear level densities, quadrupole deformation parameters. Comparison with the shell model Monte Carlo (SMMC) calculations.
doi: 10.1016/j.physletb.2021.136206
2021RY03 Eur.Phys.J. A 57, 76 (2021) Finite-temperature mean-field approximations for shell model Hamiltonians: the code HF-SHELL NUCLEAR STRUCTURE 24Mg, 144Nd, 162Dy; calculated energy surfaces, nuclear state densities, quadrupole moments. Comparison with available data.
doi: 10.1140/epja/s10050-021-00365-3
2021RY04 Phys.Rev. C 104, 044308 (2021) Skyrme pseudopotentials at next-to-next-to-leading order: Construction of local densities and first symmetry-breaking calculations NUCLEAR STRUCTURE 72,74,76,78,80,82,84,86,88,90,92,94Kr; calculated deformation energy curve as function of quadrupole moment q20. 130,132,134,136,138,140,142,144,146,148,150,152,154Nd; calculated mean-square charge radii, deformation of the proton distribution. 240Pu; calculated static fission path as function of quadrupole deformation β20 with the SLy5s1, SLy5*, and SN2LO1 parametrizations. 194Hg; calculated dynamical moment of inertia of the superdeformed band (SD-1) as a function of cranking frequency for the SLy5s1, SLy5*, and SN2LO1 parametrizations. Axial and nonaxial deformation for reflection-symmetric and reflection-asymmetric shape symmetry-breaking calculations with an extension of the Skyrme nuclear energy density functionals (EDF) with four gradients at next-to-next-to-leading order (N2LO) and with high-quality parametrization SN2LO1. Comparison with available experimental data.
doi: 10.1103/PhysRevC.104.044308
2021SC16 Eur.Phys.J. A 57, 333 (2021) G.Scamps, S.Goriely, E.Olsen, M.Bender, W.Ryssens Skyrme-Hartree-Fock-Bogoliubov mass models on a 3D mesh: effect of triaxial shape
doi: 10.1140/epja/s10050-021-00642-1
2020BE28 J.Phys.(London) G47, 113002 (2020) M.Bender, R.Bernard, G.Bertsch, S.Chiba, J.Dobaczewski, N.Dubray, S.A.Giuliani, K.Hagino, D.Lacroix, Z.Li, P.Magierski, J.Maruhn, W.Nazarewicz, J.Pei, S.Peru, N.Pillet, J.Randrup, D.Regnier, P.G.Reinhard, L.M.Robledo, W.Ryssens, J.Sadhukhan, G.Scamps, N.Schunck, C.Simenel, J.Skalski, I.Stetcu, P.Stevenson, S.Umar, M.Verriere, D.Vretenar, M.Warda, S.Aberg Future of nuclear fission theory
doi: 10.1088/1361-6471/abab4f
2020BR08 Phys.Rev. C 102, 014307 (2020) R.Briselet, Ch.Theisen, B.Sulignano, M.Airiau, K.Auranen, D.M.Cox, F.Dechery, A.Drouart, Z.Favier, B.Gall, T.Goigoux, T.Grahn, P.T.Greenlees, K.Hauschild, A.Herzan, R.-D.Herzberg, U.Jakobsson, R.Julin, S.Juutinen, J.Konki, M.Leino, A.Lopez-Martens, A.Mistry, P.Nieminen, J.Pakarinen, P.Papadakis, P.Peura, E.Rey-Herme, P.Rahkila, J.Rubert, P.Ruotsalainen, M.Sandzelius, J.Saren, C.Scholey, J.Sorri, S.Stolze, J.Uusitalo, M.Vandebrouck, A.Ward, M.Zielinska, B.Bally, M.Bender, W.Ryssens In-beam γ-ray and electron spectroscopy of 249, 251Md NUCLEAR REACTIONS 203,205Tl(48Ca, 2n), E=218 MeV; measured Eγ, Iγ, E(ce), I(ce), γγ-coin, and γ(ce)-coin using the RITU gas-filled recoil separator, GREAT spectrometer, and SAGE array at the University of Jyvaskyla Accelerator Laboratory. Recoil-decay tagging method. 249,251Md; deduced high-spin levels, J, π, K- and L-conversion coefficients, multipolarities, rotational bands, Nilsson configurations, octupole correlations. Comparison with Skyrme-Hartree-Fock-Bogoliubov theoretical calculations. 251Md, 255Lr; discussed identical transitions and bands.
doi: 10.1103/PhysRevC.102.014307
2020DU12 Phys.Rev. C 102, 044328 (2020) Zero-pairing and zero-temperature limits of finite-temperature Hartree-Fock-Bogoliubov theory NUCLEAR STRUCTURE 18,19,22,26O; calculated quasiparticle energy associated with the valence shells as function of inverse temperature, neutron-number variance, entropy, pairing energy, and Routhians as functions of effective pairing strength and inverse temperature. Combined zero-pairing and zero-temperature limits of the finite-temperature Hartree-Fock-Bogoliubov (FTHFB) formalism for open-shell systems.
doi: 10.1103/PhysRevC.102.044328
2019RY02 Phys.Rev. C 99, 044315 (2019) W.Ryssens, M.Bender, K.Bennaceur, P.-H.Heenen, J.Meyer Impact of the surface energy coefficient on the deformation properties of atomic nuclei as predicted by Skyrme energy density functionals NUCLEAR STRUCTURE 74Kr, 180,186,188,190,192,194,196,198,200Hg, 186Pb, 226Ra, 240Pu; calculated deformation energy surfaces as function of β20 parameter. 110Zr, 282Cn, 294Og; calculated deformation energy surface contours in (β, γ) plane. 180Hg, 226Ra, 240Pu; calculated heights of first, second and third barrier heights, and energies of fission isomers. Z=90-120, N=140-186; calculated binding energies and other gross properties. 188Hg; calculated Nilsson diagrams for single-particle neutron and proton states. 186,188,190,192,194,196,198,200Hg, 188,190,192,194,196,198,200,202Pb; calculated excitation energies and multipole deformations βp, l0 of the proton distribution of the superdeformed minima, S(2n), and charge quadrupole deformations β2, p for 190,192,194Hg, 192,194,196Pb. 194Hg; calculated dynamical moment of inertia of the superdeformed band as a function of cranking frequency. Z=50, N=46-74; calculated S(2n) for even-even nuclei. Z=44-74, N=82; calculated S(2p) for even-even nuclei. 144Ba; calculated deformation energy surface as a function of octupole deformation parameter β30. 218,220,222,224,226,228,230,232Th; calculated deformation energy surfaces as function of β20 and β30 parameters. 110Zr; calculated deformation energy surface as a function of non-axial octupole deformation parameter β32. Energy density functional (EDF) methods with SLy5sX parametrizations of the Skyrme EDF. Comparison with available experimental data.
doi: 10.1103/PhysRevC.99.044315
2019RY03 Eur.Phys.J. A 55, 93 (2019) W.Ryssens, M.Bender, P.-H.Heenen Iterative approaches to the self-consistent nuclear energy density functional problem NUCLEAR STRUCTURE 40Ca, 132Sn, 208Pb; calculated spherical nuclei energies using Next-to Leading Order (NLO) Skyrme Energy Density functional (EDF) Self-Consistent Field (SCF), convergence conditions, number of iterations, radial density profile, weighted dispersion of sp energies; deduced acceptable regions of model parameters. 64Ge; calculated energy-deformation surface considering quadrupole deformation β and triaxiality angle γ.
doi: 10.1140/epja/i2019-12766-6
2019SE04 Phys.Rev. C 99, 044306 (2019) S.Sels, T.Day Goodacre, B.A.Marsh, A.Pastore, W.Ryssens, Y.Tsunoda, N.Althubiti, B.Andel, A.N.Andreyev, D.Atanasov, A.E.Barzakh, M.Bender, J.Billowes, K.Blaum, T.E.Cocolios, J.G.Cubiss, J.Dobaczewski, G.J.Farooq-Smith, D.V.Fedorov, V.N.Fedosseev, K.T.Flanagan, L.P.Gaffney, L.Ghys, P.-H.Heenen, M.Huyse, S.Kreim, D.Lunney, K.M.Lynch, V.Manea, Y.Martinez Palenzuela, T.M.Medonca, P.L.Molkanov, T.Otsuka, J.P.Ramos, R.E.Rossel, S.Rothe, L.Schweikhard, M.D.Seliverstov, P.Spagnoletti, C.Van Beveren, P.Van Duppen, M.Veinhard, E.Verstraelen, A.Welker, K.Wendt, F.Wienholtz, R.N.Wolf, A.Zadvornaya Shape staggering of midshell mercury isotopes from in-source laser spectroscopy compared with density-functional-theory and Monte Carlo shell-model calculations NUCLEAR MOMENTS 177,178,179,180,181,182,183,184,185,185mHg; measured hyperfine structure (hfs) spectra, hyperfine coupling constants, isotope shifts, and rms charge radii using the in-source resonance-ionization spectroscopy method combined with decay spectroscopy, and Multi-Reflection Time-of-Flight Mass Spectrometer (MR-TOF MS) at CERN-ISOLDE facility; deduced magnetic dipole moments, and spectroscopic quadrupole moments, configurations. Comparison with theoretical calculations using density functional theory (DFT) with Skyrme parametrizations, and Monte Carlo shell model (MCSM). Ions of Hg activities produced in Pb(p, X), E=1.4 GeV, using molten lead target. NUCLEAR REACTIONS Pb, U(p, X)177Hg/178Hg/179Hg/180Hg/181Hg/182Hg/183Hg/184Hg/185Hg/185mHg, E=1.4 GeV from PS-Booster synchrotron; measured production yields for different target-ion source configurations: VADLIS or RILIS at CERN-ISOLDE facility.
doi: 10.1103/PhysRevC.99.044306
2019VE07 Phys.Rev. C 100, 044321 (2019) E.Verstraelen, A.Teigelhofer, W.Ryssens, F.Ames, A.Barzakh, M.Bender, R.Ferrer, S.Goriely, P.-H.Heenen, M.Huyse, P.Kunz, J.Lassen, V.Manea, S.Raeder, P.Van Duppen Search for octupole-deformed actinium isotopes using resonance ionization spectroscopy NUCLEAR MOMENTS 225,226,227,228,229Ac; measured hyperfine spectra, and isotope shifts by probing a 2D3/2 to 4P5/2 atomic transition using in-source resonance ionization spectroscopy at the ISAC facility in TRIUMF, where the actinium isotopes were produced in irradiating UCx with 480-MeV proton beam, and ionized by TRIUMF Resonant Ionization Laser Ion Source (TRILIS); deduced mean-square charge radii, hyperfine parameters, magnetic dipole moments, configurations; calculated β20 and β30 deformation parameters using SLy5s1, BSk31, and DD-MEB2 interactions. Comparison with previous experimental measurements, and with self-consistent calculations using energy density functionals SLy5s1, BSk31, and DD-MEB1. Z=82-89, N=120-150; systematics of experimental mean-square charge radii, and odd-even staggering parameter, and compared with theoretical calculations.
doi: 10.1103/PhysRevC.100.044321
2018RY04 Acta Phys.Pol. B49, 339 (2018) W.Ryssens, M.Bender, P.-H.Heenen Towards Symmetry-unrestricted Skyrme-HFB in Coordinate-space Representation: The Example of Rotational Bands of the Octupole-deformed Nucleus 222Th NUCLEAR STRUCTURE 222Th; calculated deformation energy relative to β20-β30 plane, quadrupole and octupole deformation of he mean-field minimum of the Th isotopes, excitation energy of rotational states using cranked HFB calculations; compared to the data for yrast states of positive and negative parity taken from literature; deduced sudden change in configuration observed with the shape of the yrast state jumping from large octupole deformation at low spin to small octupole deformation at high spin.
doi: 10.5506/aphyspolb.49.339
2017VE03 Phys.Rev. C 95, 061302 (2017) M.Venhart, F.A.Ali, W.Ryssens, J.L.Wood, D.T.Joss, A.N.Andreyev, K.Auranen, B.Bally, M.Balogh, M.Bender, R.J.Carroll, J.L.Easton, P.T.Greenlees, T.Grahn, P.-H.Heenen, A.Herzan, U.Jakobsson, R.Julin, S.Juutinen, D.Klc, J.Konki, E.Lawrie, M.Leino, V.Matousek, C.G.McPeake, D.O'Donnell, R.D.Page, J.Pakarinen, J.Partanen, P.Peura, P.Rahkila, P.Ruotsalainen, M.Sandzelius, J.Saren, B.Saygi, M.Sedlak, C.Scholey, J.Sorri, S.Stolze, A.Thornthwaite, J.Uusitalo, M.Veselsky De-excitation of the strongly coupled band in 177Au and implications for core intruder configurations in the light Hg isotopes NUCLEAR REACTIONS 92Mo(88Sr, 2np), E=399 MeV; measured reaction products, Eγ, Iγ, (ion implants)γ-coin, γγ-coin, γγ(θ)(DCO), α-decay tagging method using Jurogam-II array, GREAT spectrometer, and RITU gas-filled separator at the K=130 MeV cyclotron facility of the University of Jyvaskyla. 177Au; deduced high-spin levels, conversion coefficients, multipolarity, J, π, bands, configuration. Comparisons with cranked Hartree-Fock-Bogoliubov (HFB) calculations based on Skyrme energy functionals, and with the structures of 187Au and 178Hg nuclei.
doi: 10.1103/PhysRevC.95.061302
2015RY07 Phys.Rev. C 92, 064318 (2015) W.Ryssens, P.-H.Heenen, M.Bender Numerical accuracy of mean-field calculations in coordinate space NUCLEAR STRUCTURE 40Ca, 132Sn, 208Pb; calculated total energies and rms radii, isotope shifts with the present 3D code and compared with the spherical code LENTEUR. 34Ne; calculated neutron rms radius, radial density profile. 240Pu; calculated single-particle levels, J, π as function of the mesh discretization, energy curve as function of β2, mass octupole moment β3 and mass hexadecapole moment β4 along the fission path, properties of the ground state and superdeformed fission isomer state. 98,100,102,104,106,108,110,112,114,116,118,120,122,124,126,128,130,132Cd, 102,104,106,108,110,112,114,116,118,120,122,124,126,128,130,132,134Sn, 108,110,112,114,116,118,120,122,124,126,128,130,132,134,136,138Te; calculated absolute differences of two-neutron separation energies between four mesh discretizations, S(2n), mass β2 quadrupole moment for Te isotopes. Investigation of the numerical accuracy of solution of self-consistent mean-field equations based on energy density functionals (EDFs) by using a discretization on a 3D Cartesian coordinate-space mesh.
doi: 10.1103/PhysRevC.92.064318
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