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NSR database version of May 24, 2024.

Search: Author = W.Ryssens

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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
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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
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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
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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
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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
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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
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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
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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
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2021RY03      Eur.Phys.J. A 57, 76 (2021)

W.Ryssens, Y.Alhassid

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
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2021RY04      Phys.Rev. C 104, 044308 (2021)

W.Ryssens, M.Bender

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
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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
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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
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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
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2020DU12      Phys.Rev. C 102, 044328 (2020)

T.Duguet, W.Ryssens

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
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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
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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
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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
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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
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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 β2030 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
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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
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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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