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NSR database version of May 20, 2024.

Search: Author = V.Hellemans

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2013HE26      Phys.Rev. C 88, 064323 (2013)

V.Hellemans, A.Pastore, T.Duguet, K.Bennaceur, D.Davesne, J.Meyer, M.Bender, P.-H.Heenen

Spurious finite-size instabilities in nuclear energy density functionals

NUCLEAR STRUCTURE 16O, 40,48Ca, 78Ni, 176Sn, 208Pb; calculated binding energies; investigated instabilities in energy density functional (EDF) calculations to finite-wavelength instabilities of homogeneous symmetric computed at the RPA level. Nine parameterizations based on traditional form of the Skyrme EDF.Systematic calculations with both HOSPHE and LENTEUR formalisms.

doi: 10.1103/PhysRevC.88.064323
Citations: PlumX Metrics

2013PA17      Phys.Scr. T154, 014014 (2013)

A.Pastore, D.Davesne, K.Bennaceur, J.Meyer, V.Hellemans

Fitting Skyrme functionals using linear response theory

NUCLEAR STRUCTURE Z=20, 28, 50, 82; analyzed available data and fitted binding energies, charge radii. Linear response theory in symmetric nuclear matter.

doi: 10.1088/0031-8949/2013/T154/014014
Citations: PlumX Metrics

2012CA13      Phys.Rev. C 85, 034324 (2012)

M.A.Caprio, F.Q.Luo, K.Cai, V.Hellemans, Ch.Constantinou

Generalized seniority for the shell model with realistic interactions

NUCLEAR STRUCTURE 41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59Ca; calculated levels, J, π, orbital occupations, quadrupole moments, B(E2), magnetic moment. Comparison between seniority (ν=1-3) model space and full shell-model space.

doi: 10.1103/PhysRevC.85.034324
Citations: PlumX Metrics

2012CA30      J.Phys.(London) G39, 105108 (2012)

M.A.Caprio, F.Q.Luo, K.Cai, Ch.Constantinou, V.Hellemans

Generalized seniority with realistic interactions in open-shell nuclei

NUCLEAR STRUCTURE 40,42,44,46,48,50,52,54,56,58,60Ca, 42,44,46,48,50,52,54,56,58,60,62Ti, 44,46,48,50,52,54,56,58,60,62,64Cr; calculated energy levels, J, π, electric quadrupole and dipole magnetic moments. Shell model calculations, FPD6 and GXPF1 interactions, comparison with available data.

doi: 10.1088/0954-3899/39/10/105108
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2012HE02      Phys.Rev. C 85, 014326 (2012)

V.Hellemans, P.-H.Heenen, M.Bender

Tensor part of the Skyrme energy density functional. III. Time-odd terms at high spin

NUCLEAR STRUCTURE 152Dy, 194Hg; calculated deformation energy, proton and neutron Nilsson diagrams, dynamical moments of inertia of superdeformed bands, evolution of time-even and time-odd terms in the energy density functional, proton and neutron quasiparticle Routhians. Cranked Hartree-Fock-Bogoliubov approach with several parameterization covering a wide range for the isoscalar and isovector tensor coupling constants. Time-odd tensor terms in Skyrme EDF, effect of variations of their coupling constants, and finite-size instabilities. Comparison with experimental data for superdeformed bands.

doi: 10.1103/PhysRevC.85.014326
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2012WA32      Phys.Rev. C 86, 054309 (2012)

K.Washiyama, K.Bennaceur, B.Avez, M.Bender, P.-H.Heenen, V.Hellemans

New parametrization of Skyrme's interaction for regularized multireference energy density functional calculations

NUCLEAR STRUCTURE 40,48Ca, 56Ni, 100,132Sn, 208Pb; calculated binding energy, charge radii. 24Mg, 74Kr, 80,100Zr, 186Pb; calculated potential energy curves versus β2. 240Pu; calculated fission barrier versus β2. 194Hg; calculated dynamical moment of inertia of superdeformed band. 249Bk, 251Cf; calculated one-quasiparticle levels. Z=20, A=36-52; Z=28, A=54-72; Z=50, A=100-134; Z=82, A=180-214; N=20, Z=10-22; N=50, Z=30-50; N=82, Z=48-70; N=126, Z=80-92; calculated binding energies, charge radii for even-even nuclei. Energy density functional calculations for spherical and deformed nuclei with new Skyrme parametrization with integer powers of the density. Comparison with experimental data.

doi: 10.1103/PhysRevC.86.054309
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2011GA35      Phys.Rev. C 84, 014331 (2011)

J.E.Garcia-Ramos, V.Hellemans, K.Heyde

Platinum nuclei: Concealed configuration mixing and shape coexistence

NUCLEAR STRUCTURE 172,174,176,178,180,182,184,186,188,190,192,194Pt; calculated levels, J, π, unperturbed regular states, intruder states, g factors of first 2+ states, isotope shifts, rms charge radii. 174,180,186,192Pt; calculated unperturbed regular levels, intruder (2p-2h) levels, and levels with fully mixed configuration, B(E2), B(E2) ratios. 176,178,180Pt; calculated α-decay hindrance factors from the decay of 180,182,184Hg nuclei. Interacting boson model with configuration mixing (IBM-CM) calculations. Comparison with experimental data. 180,182,184,186,188,190,192,194,196,198,200,202,204,206,208Pb, 168,170,172,174,176,178,180,182,184,186,188,190,192,194,196,198,200,202,204Pt, 174,176,178,180,182,184,186,188,190,192,194,196,198,200,202,204,206Hg, 176Yb, 178Hf, 180W, 182Os; analyzed systematics of energy spectra of yrast and non-yrast levels.

doi: 10.1103/PhysRevC.84.014331
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2009DE11      Phys.Rev. C 79, 034305 (2009)

S.De Baerdemacker, K.Heyde, V.Hellemans

Spectral properties of a tractable collective Hamiltonian

doi: 10.1103/PhysRevC.79.034305
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2009HE04      Nucl.Phys. A819, 11 (2009)

V.Hellemans, P.Van Isacker, S.De Baerdemacker, K.Heyde

Criticality in the configuration-mixed interacting boson model:(2) Q^(x1)Q^(x1)-Q^(x2)Q^(x2) mixing

doi: 10.1016/j.nuclphysa.2009.01.002
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2008HE06      Phys.Rev. C 77, 064324 (2008)

V.Hellemans, S.De Baerdemacker, K.Heyde

Configuration mixing in the neutron-deficient 186-196Pb isotopes

NUCLEAR STRUCTURE 188,190,192,194,196Pb; calculated levels, J, π, B(E2), weights of the IBM wave function, quadrupole deformations, mixing strengths between 0p-0h, 2p-2h, 4p-4h levels. Comparison with experimental data.

doi: 10.1103/PhysRevC.77.064324
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2007DE09      Phys.Rev.Lett. 98, 112502 (2007)

H.De Witte, A.N.Andreyev, N.Barre, M.Bender, T.E.Cocolios, S.Dean, D.Fedorov, V.N.Fedoseyev, L.M.Fraile, S.Franchoo, V.Hellemans, P.H.Heenen, K.Heyde, G.Huber, M.Huyse, H.Jeppesen, U.Koster, P.Kunze, S.R.Lesher, B.A.Marsh, I.Mukha, B.Roussiere, J.Sauvage, M.Seliverstov, I.Stefanescu, E.Tengborn, K.Van de Vel, J.Van de Walle, P.Van Duppen, Yu.Volkov

Nuclear Charge Radii of Neutron-Deficient Lead Isotopes Beyond N = 104 Midshell Investigated by In-Source Laser Spectroscopy

ATOMIC PHYSICS 182,183,183m,184,185,185m,186,187,187m,188,189,189m,190Pb; measured isotope shifts; deduced charge radii.

doi: 10.1103/PhysRevLett.98.112502
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Data from this article have been entered in the XUNDL database. For more information, click here.

2007HE21      Acta Phys.Pol. B38, 1599 (2007)

V.Hellemans, P.Van Isacker, S.De Baerdemacker, K.Heyde

Phase Transitions in the Configuration Mixed Interacting Boson Model: U(5)-O(6) Mixing

2007HE27      Nucl.Phys. A789, 164 (2007), Erratum Nucl.Phys. A801, 80 (2008)

V.Hellemans, P.Van Isacker, S.De Baerdemacker, K.Heyde

Criticality in the configuration-mixed interacting boson model:(1) U(5)-Q(X) Q(X) mixing

doi: 10.1016/j.nuclphysa.2007.12.003
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2007PA05      Phys.Rev. C 75, 014302 (2007)

J.Pakarinen, V.Hellemans, R.Julin, S.Juutinen, K.Heyde, P.-H.Heenen, M.Bender, I.G.Darby, S.Eeckhaudt, T.Enqvist, T.Grahn, P.T.Greenlees, F.Johnston-Theasby, P.Jones, H.Kettunen, M.Leino, A.-P.Leppanen, P.Nieminen, M.Nyman, R.D.Page, P.M.Raddon, P.Rahkila, C.Scholey, J.Uusitalo, R.Wadsworth

Investigation of nuclear collectivity in the neutron mid-shell nucleus 186Pb

NUCLEAR REACTIONS 106Pd(83Kr, 3n), E=355 MeV; measured Eγ, Iγ, γγ-, (recoil)γ-coin. 186Pb deduced levels, J, π, rotational and vibrational bands, deformation. Recoil-decay tagging, interacting boson model and mean-field model calculations.

doi: 10.1103/PhysRevC.75.014302
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Data from this article have been entered in the XUNDL database. For more information, click here.

2006DE13      Nucl.Phys. A769, 16 (2006)

S.De Baerdemacker, L.Fortunato, V.Hellemans, K.Heyde

Solution of the Bohr Hamiltonian for a periodic potential with minimum at γ=π/6

doi: 10.1016/j.nuclphysa.2006.01.016
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2005FO02      Acta Phys.Pol. B36, 1351 (2005)

R.Fossion, V.Hellemans, S.De Baerdemacker, K.Heyde

Shape coexistence in the lead isotopes using algebraic models: description of spectroscopic and ground-state related properties

NUCLEAR STRUCTURE 186,188,190,192,194,196Pb; calculated levels, J, π, two-neutron separation energies. Interacting boson model, three-configuration mixing.

2005GA58      Eur.Phys.J. A 26, 221 (2005)

J.E.Garcia-Ramos, K.Heyde, R.Fossion, V.Hellemans, S.De Baerdemacker

A theoretical description of energy spectra and two-neutron separation energies for neutron-rich zirconium isotopes

NUCLEAR STRUCTURE 94,96,98,100,102,104Zr; calculated level energies, B(E2), two-neutron separation energies. Interacting boson model.

doi: 10.1140/epja/i2005-10176-1
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2005HE09      Phys.Rev. C 71, 034308 (2005)

V.Hellemans, R.Fossion, S.De Baerdemacker, K.Heyde

Configuration mixing in 188Pb: Band structure and electromagnetic properties

NUCLEAR STRUCTURE 188Pb; calculated rotational bands level energies, J, π, B(E2), monopole transition strengths, quadrupole moments, deformation, configuration mixing features. Interacting boson model, collective rotational model, comparisons with data.

doi: 10.1103/PhysRevC.71.034308
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2005PA42      Phys.Rev. C 72, 011304 (2005)

J.Pakarinen, I.G.Darby, S.Eeckhaudt, T.Enqvist, T.Grahn, P.T.Greenlees, V.Hellemans, K.Heyde, F.Johnston-Theasby, P.Jones, R.Julin, S.Juutinen, H.Kettunen, M.Leino, A.-P.Leppanen, P.Nieminen, M.Nyman, R.D.Page, P.M.Raddon, P.Rahkila, C.Scholey, J.Uusitalo, R.Wadsworth

Evidence for oblate structure in 186Pb

NUCLEAR REACTIONS 106Pd(83Kr, 3n), E=355 MeV; measured Eγ, Iγ, γγ-, (recoil)γ-coin. 186Pb deduced levels, J, π, oblate deformation. Jurogam array, recoil-decay tagging, interacting boson model calculations.

doi: 10.1103/PhysRevC.72.011304
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Data from this article have been entered in the XUNDL database. For more information, click here.

2004HE12      Phys.Rev. C 69, 054304 (2004)

K.Heyde, J.Jolie, R.Fossion, S.De Baerdemacker, V.Hellemans

Phase transitions versus shape coexistence

NUCLEAR STRUCTURE 110Ru, 114Cd, 118Te, 122Ba, 182,184,186,188,190,192,194,196,198,200,202,204,206Pb; analyzed levels, J, π, B(E2), phase transition and shape coexistence features.

doi: 10.1103/PhysRevC.69.054304
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