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NSR database version of April 26, 2024.

Search: Author = A.Repko

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2024NE01      Eur.Phys.J. A 60, 28 (2024)

V.O.Nesterenko, P.I.Vishnevskiy, P.-G.Reinhard, A.Repko, J.Kvasil

Microscopic analysis of dipole electric and magnetic strengths in ¹⁵⁶Gd

NUCLEAR STRUCTURE ¹⁵⁶Gd; calculated deformation parameters, proton and neutron pairing gaps, QRPA E1 photoabsorption and M1 SFGR strengths within a fully self-consistent Quasiparticle Random Phase Approximation (QRPA) with Skyrme forces SVbas, SLy6 and SG2; deduced the effect of the central exchange term from the Skyrme functional. Comparison with available data.

doi: 10.1140/epja/s10050-024-01251-4
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2022BA04      Phys.Rev. C 105, 024311 (2022)

A.Bahini, V.O.Nesterenko, I.T.Usman, P.von Neumann-Cosel, R.Neveling, J.Carter, J.Kvasil, A.Repko, P.Adsley, N.Botha, J.W.Brummer, L.M.Donaldson, S.Jongile, T.C.Khumalo, M.B.Latif, K.C.W.Li, P.Z.Mabika, P.T.Molema, C.S.Moodley, S.D.Olorunfunmi, P.Papka, L.Pellegri, B.Rebeiro, E.Sideras-Haddad, F.D.Smit, S.Triambak, J.J.van Zyl

Isoscalar giant monopole resonance in ²⁴Mg and ²⁸Si: Effect of coupling between the isoscalar monopole and quadrupole strength

NUCLEAR REACTIONS ²⁴Mg, ²⁸Si(α, α'), E=196 MeV; measured Eα, Iα, angular distributions; deduced σ(θ). ²⁴Mg, ²⁸Si; deduced isoscalar monopole (IS0) strength distribution, coupling between IS0 and isoscalar quadrupole (IS2) strength. Multipole decomposition and DWBA analysis. Comparison with QRPA calculations and with previous experimental data. K600 magnetic spectrometer at iThemba LABS.

doi: 10.1103/PhysRevC.105.024311
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD1019. Data from this article have been entered in the XUNDL database. For more information, click here.

2022NE13      Phys.Atomic Nuclei 85, 858 (2022)

V.O.Nesterenko, P.I.Vishnevskiy, A.Repko, J.Kvasil

Low-Energy M1 States in Deformed Nuclei: Spin Scissors or Spin-Flip?

NUCLEAR STRUCTURE ¹⁶⁴Dy, ⁵⁸Ni; calculated low-energy M1 states in the framework of fully self-consistent Quasiparticle Random-Phase Approximation (QRPA) with various Skyrme forces; deduced the low-energy spin-scissors M1 resonance suggested within Wigner Function Moments (WFM) approach, possible relation of this resonance

doi: 10.1134/S1063778823010404
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2021NE04      Phys.Rev. C 103, 064313 (2021)

V.O.Nesterenko, P.I.Vishnevskiy, J.Kvasil, A.Repko, W.Kleinig

Microscopic analysis of low-energy spin and orbital magnetic dipole excitations in deformed nuclei

NUCLEAR STRUCTURE ^160,162,164Dy, ²³²Th; calculated energies of the first 2+ states, proton and neutron pairing gaps, parameter β of the equilibrium axial quadrupole deformation, B(M1) and B(E2) strengths, orbital, spin, and total M1 strengths at spin-scissors resonance (SSR) and ordinary orbital scissors resonance (OSR) energy ranges, M1 spin-flip giant resonances; deduced that deformation not the principle origin of the low-energy spin M1 states but only a factor affecting their features. Fully self-consistent Skyrme quasiparticle random phase approximation (QRPA) method using SkM*, SVbas, and SG2 Skyrme forces, within the Wigner function moments (WFM) approach. Comparison with experimental data.

doi: 10.1103/PhysRevC.103.064313
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2019AB13      Acta Phys.Pol. B50, 555 (2019)

M.Abolghasem, P.Alexa, A.Repko, P.-G.Reinhard

Evolution of Nuclear Shapes and Structure in Tellurium, Xenon, Barium and Cerium Isotopes

NUCLEAR STRUCTURE ^{134,136,138,140,142,144,146,148,150,152,154,156,158,160,162,164,166,168,170,172,174,176,178}Te, ^{136,138,140,142,144,146,148,150,152,154,156,158,160,162,164,166,168,170,172,174,176,178,180}Xe, ^{138,140,142,144,146,148,150,152,154,156,158,160,162,164,166,168,170,172,174,176,178,180,182}Ba, ^{140,142,144,146,148,150,152,154,156,158,160,162,164,166,168,170,172,174,176,178,180,182,184}Ce; calculated quadrupole β₂, octupole β₃ and hexadecapole β₄ deformation parameters, level energies. Hartree-Fock+BCS and Skyrme QRPA calculations. Comparison to experimental results.

doi: 10.5506/aphyspolb.50.555
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2019KV01      Eur.Phys.J. A 55, 213 (2019)

J.Kvasil, A.Repko, V.O.Nesterenko

NUCLEAR STRUCTURE ¹⁵⁴Sm; calculated QRPA strength function for E10(T=0) transitions with poluted strength and using Spuriosity Elimination Before RPA (SEBRPA) procedure, also strength functions for E1μ transitions, isoscalar and icovector QRPA strength functions for compression E1μ transitions and for toroidal E1μ transitions.

doi: 10.1140/epja/i2019-12898-7
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2019NE07      Phys.Rev. C 100, 064302 (2019)

V.O.Nesterenko, A.Repko, J.Kvasil, P.-G.Reinhard

Individual dipole toroidal states: Main features and search in the (e, e') reaction

NUCLEAR REACTIONS ²⁴Mg(e, e'), q_effective<3 fm^-1; calculated B(E1), B(M2), B(E3), transversal form factors, cross sections for toroidal and compressional states (TS and CS) and the giant-dipole resonance (GDR) using quasiparticle random-phase approximation (QRPA) with Skyrme forces. Comparison with available experimental data.

doi: 10.1103/PhysRevC.100.064302
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2019RE02      Phys.Rev. C 99, 044307 (2019)

A.Repko, J.Kvasil, V.O.Nesterenko

Elimination of spurious modes within quasiparticle random-phase approximation

NUCLEAR STRUCTURE ¹⁵⁴Sm; calculated isoscalar and isovector E0, E1, E2, and M1 strength functions with and without elimination of spurious admixtures (SA) using the quasiparticle random-phase approximation (QRPA) with SLy6 parametrization. Comparison with experimental values and other theoretical predictions. Proposed a general method for elimination of spurious admixture (SA) from RPA/QRPA intrinsic nuclear excitations.

NUCLEAR REACTIONS ¹⁵⁴Sm(γ, X), E=0-40 MeV; calculated photoabsorption σ(E) using QRPA approach with Skyrme forces, and compared with experimental data.

doi: 10.1103/PhysRevC.99.044307
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2019RE10      Eur.Phys.J. A 55, 242 (2019)

A.Repko, V.O.Nesterenko, J.Kvasil, P.-G.Reinhard

Systematics of toroidal dipole modes in Ca, Ni, Zr, and Sn isotopes

doi: 10.1140/epja/i2019-12770-x
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2018NE05      Phys.Rev.Lett. 120, 182501 (2018)

V.O.Nesterenko, A.Repko, J.Kvasil, P.-G.Reinhard

Individual Low-Energy Toroidal Dipole State in ²⁴Mg

NUCLEAR STRUCTURE ²⁴Mg; calculated toroidal and compression B(E1), QRPA densities, low-energy dipole excitations within the Skyrme quasiparticle random phase approximation for axial nuclei. Comparison with available data.

doi: 10.1103/PhysRevLett.120.182501
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2017RE11      Eur.Phys.J. A 53, 221 (2017)

A.Repko, J.Kvasil, V.O.Nesterenko, P.-G.Reinhard

Pairing and deformation effects in nuclear excitation spectra

NUCLEAR STRUCTURE ^152,154,156Sm; calculated γ-vibrational states energy, J, π, B(E2), QRPA transitional densities, deformation, photoabsorption σ vs E, compression isoscalar γ E1 strength (ISGDR) using QRPA with mean field treated within HF+BCS. Compared with available data.

doi: 10.1140/epja/i2017-12406-3
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2016KV01      Phys.Rev. C 94, 064302 (2016)

J.Kvasil, V.O.Nesterenko, A.Repko, W.Kleinig, P.-G.Reinhard

Deformation-induced splitting of the isoscalar E0 giant resonance: Skyrme random-phase-approximation analysis

NUCLEAR STRUCTURE ^142,146,150Nd, ¹⁵⁴Sm, ^{106,108,110,112,114,116}Cd, ¹⁶⁴Dy, ¹⁶⁸Er, ¹⁷²Yb, ²³⁸U, ^242,254,270No, ^264,284,304Fl; calculated strengths and other features of isoscalar giant monopole resonance (ISGMR) in deformed nuclei using Skyrme quasiparticle random-phase approximation (QRPA). Systematics for medium, rare-earth, actinide and superheavy nuclides. Comparison with available experimental data.

doi: 10.1103/PhysRevC.94.064302
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2016NE06      Phys.Rev. C 93, 034301 (2016)

V.O.Nesterenko, V.G.Kartavenko, W.Kleinig, J.Kvasil, A.Repko, R.V.Jolos, P.-G.Reinhard

Skyrme random-phase-approximation description of lowest K^π = 2⁺_γ states in axially deformed nuclei

NUCLEAR STRUCTURE ^150,152Nd, ^152,154,156Sm, ^{154,156,158,160}Gd, ^{158,160,162,164,166}Dy, ^{162,164,166,168,170}Er, ^{168,170,172,174,176}Yb, ^{168,170,172,174,176,178,180}Hf, ^{178,180,182,184,186}W, ^{232,234,236,238}U; calculated energies and B(E2) of the lowest quadrupole γ-vibrational Kπ=2+ states in axially deformed rare-earth and uranium even-even nuclei. ¹⁵²Nd, ¹⁶⁴Dy, ¹⁷²Yb, ²³⁸U; calculated isoscalar strength function for the ISGQR. Separable random-phase-approximation (SRPA) method based on the Skyrme functional with the Skyrme forces SV-bas and SkM*, and corrected by using pairing blocking effect. Comparison with experimental data.

doi: 10.1103/PhysRevC.93.034301
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2016PA04      Phys.Rev. C 93, 014318 (2016)

H.Pai, T.Beck, J.Beller, R.Beyer, M.Bhike, V.Derya, U.Gayer, J.Isaak, Krishichayan, J.Kvasil, B.Loher, V.O.Nesterenko, N.Pietralla, G.Martinez-Pinedo, L.Mertes, V.Yu.Ponomarev, P.-G.Reinhard, A.Repko, P.C.Ries, C.Romig, D.Savran, R.Schwengner, W.Tornow, V.Werner, J.Wilhelmy, A.Zilges, M.Zweidinger

Magnetic dipole excitations of ⁵⁰Cr

NUCLEAR REACTIONS ⁵⁰Cr(γ, γ'), (polarized γ, γ'), E<9.7 MeV bremsstrahlung; measured Eγ, Iγ, γ(θ), γ-polarization asymmetry, integrated σ, γ-branching ratios. Experiments performed at Darmstadt S-DALINAC and TUNL High Intensity γ-ray Source (HIγS) facilities. ⁵⁰Cr; deduced levels, J, π, B(M1), reduced widths, configurations, M1 spin-flip transition. Discussed isovector rotation-like oscillations of 1+ states versus scissors-type mode. Comparison with Skyrme quasiparticle random-phase-approximation (QRPA) and the large-scale shell model (LSSM) calculations.

doi: 10.1103/PhysRevC.93.014318
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Data from this article have been entered in the XUNDL database. For more information, click here.

2015KV01      Phys.Scr. 90, 114007 (2015)

J.Kvasil, D.Bozik, A.Repko, P.-G.Reinhard, V.O.Nesterenko, W.Kleinig

Monopole giant resonance in ^100-132Sn, ¹⁴⁴Sm and ²⁰⁸Pb

NUCLEAR STRUCTURE ^{100,102,104,106,108,110,112,114,116,118,120,122,124,126,128,130,132}Sn, ¹⁴⁴Sm, ²⁰⁸Pb; calculated giant monopole resonance (GMR) strength functions. Comparison with available data.

doi: 10.1088/0031-8949/90/11/114007
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2014RE02      Phys.Rev. C 89, 024321 (2014)

P.-G.Reinhard, V.O.Nesterenko, A.Repko, J.Kvasil

Nuclear vorticity in isoscalar E1 modes: Skyrme-random-phase approximation analysis

NUCLEAR STRUCTURE ²⁰⁸Pb; calculated E1 strength functions, transition densities, E1 current and velocity fields, form factors for isoscalar 1- states in toroidal and compression modes using Skyrme SLy6 random phase approximation (RPA) model; analyzed nuclear vorticity (hydrodynamical and Rawenthall-Wambach).

doi: 10.1103/PhysRevC.89.024321
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2013KV01      Phys.Scr. T154, 014019 (2013)

J.Kvasil, A.Repko, V.O.Nesterenko, W.Kleinig, P.-G.Reinhard, N.Lo Iudice

Toroidal, compression and vortical dipole strengths in ¹²⁴Sn

NUCLEAR STRUCTURE ^100,124,132Sn; calculated toroidal, vortical and compression dipole strength functions. Self-consistent separable Skyrme-RPA approach.

doi: 10.1088/0031-8949/2013/T154/014019
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2013RE03      Phys.Rev. C 87, 024305 (2013)

A.Repko, P.-G.Reinhard, V.O.Nesterenko, J.Kvasil

Toroidal nature of the low-energy E1 mode

NUCLEAR STRUCTURE ²⁰⁸Pb; calculated isoscalar and isovector low-energy E1 strength function S(E), summed current transition densities (CTD), proton and neutron transition densities (TD) for pygmy dipole resonance (PDR). Toroidal T=0 resonance. Fully self-consistent Skyrme-random-phase approximation (RPA) calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.87.024305
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2012KV01      Int.J.Mod.Phys. E21, 1250041 (2012)

J.Kvasil, A.Repko, V.O.Nesterenko, W.Kleinig, P.-G.Reinhard

E1 strength in light nuclei: Skyrme RPA analysis

NUCLEAR REACTIONS ⁴⁸Ca, ⁵⁰Ti, ⁵²Cr, ⁵⁴Fe(γ, X), E<30 MeV; calculated photoabsorption σ, giant dipole resonance. SRPA approach based on the Skyrme functional, comparison with available data.

doi: 10.1142/S0218301312500413
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