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NSR database version of April 26, 2024.

Search: Author = A.Kardan

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2024KA12      Phys.Rev. C 109, 034320 (2024)

A.Kardan, P.M.Walker, I.Ragnarsson

Isomeric states in neutron-rich Z=76 isotopes and N=116 isotones

doi: 10.1103/PhysRevC.109.034320
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2023KA10      Phys.Rev. C 107, 044306 (2023)

A.Kardan, B.G.Carlsson, T.Dossing, I.Ragnarsson

High-spin rotational bands in ¹³⁷Nd

NUCLEAR STRUCTURE ¹³⁷Nd; calculated energies of low-lying CNS configurations in ¹³⁷Nd for five groups: triaxial bands, near-oblate bands, HD bands, terminating bands, and superdeformed (SD) bands as function of spin, single-proton and single-neutron energies as a function of rotational frequency (Routhians), energies of levels in ¹³⁷Nd relative to a rotating liquid drop reference for the observed bands above of spin ≈ 15, level densities as functions of spin and level energies using unpaired cranked Nilsson-Strutinsky (CNS) and cranked Nilsson-Strutinsky-Bogoliubov methods; analyzed in detail experimentally observed high-spin and highly deformed (HD) prolate rotational bands in ¹³⁷Nd by 2019Pe08 (Phys. Rev. C 99, 041301 (2019)).

doi: 10.1103/PhysRevC.107.044306
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2022SH28      Phys.Scr. 97, 045301 (2022)

M.Shayestefar, A.Kardan

General properties of terminating bands in the A = 110 and A = 160 mass regions

NUCLEAR STRUCTURE ^{107,108,109,110,111,112,113}Sb, ^155,156,157Ho; calculated excitation energies, proton and neutron orbital configurations, high spin states, bands within the cranked Nilsson-Strutinsky (CNS) approach.

doi: 10.1088/1402-4896/ac5a1e
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2022SH42      Int.J.Mod.Phys. E31, 2250077 (2022)

M.Shayestefar, A.Kardan

The role of the orbitals to construct a terminating state of the A ∼ 160 mass region

NUCLEAR STRUCTURE ¹⁵³Tb, ¹⁵⁴Dy, ¹⁵⁶Ho, ¹⁵⁶Er; analyzed the role of the orbitals near the Fermi surface in the properties of the terminating bands for some N=88 isotones and Z=68 isotopes; deduced the contribution of the proton holes in the core within terminating configurations is very effective toenergy cost at the end of the rotational bands and then, termination type.

doi: 10.1142/S021830132250077X
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2021BA03      Phys.Rev. C 103, 014301 (2021)

A.Basu, A.K.Singh, I.Ragnarsson, B.G.Carlsson, A.Kardan, G.B.Hagemann, G.Sletten, B.Herskind, H.Hubel, S.Chmel, A.N.Wilson, J.Rogers, R.V.F.Janssens, M.P.Carpenter, T.L.Khoo, F.G.Kondev, T.Lauritsen, S.Zhu, A.Korichi, P.Fallon, B.M.Nyako, J.Timar

Highly deformed band structures due to core excitations in ¹²³Xe

NUCLEAR REACTIONS ⁸⁰Se(⁴⁸Ca, 5n)¹²³Xe, E=207 MeV; measured Eγ, Iγ, two to four-fold γγ-coin, angular-distribution ratios for eight transitions using the Gammasphere array at ATLAS-ANL facility. ¹²³Xe; deduced high-spin levels, J, π, multipolarities, highly-deformed rotational bands, alignments, band crossings, configurations; calculated total energy surfaces. Comparison with cranked Nilsson-Strutinsky (CNS) and cranked Nilsson-Strutinsky-Bogoliubov (CNSB) models.

doi: 10.1103/PhysRevC.103.014301
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2021SH33      Europhys.Lett. 135, 32001 (2021)

M.Shayestefar, A.Kardan

Gradual loss of collectivity in rotational bands in N = 89 isotones

NUCLEAR STRUCTURE ¹⁵⁵Dy, ¹⁵⁶Ho, ¹⁵⁷Er; calculated low-lying negative parity and the lowest positive parity configurations, bands within the cranked Nilsson-Strutinsky (CNS) formalism. Comparison with available data.

doi: 10.1209/0295-5075/ac0f0f
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2021SI05      Phys.Rev. C 103, 024325 (2021)

M.A.Sithole, J.F.Sharpey-Schafer, E.A.Lawrie, S.N.T.Majola, A.Kardan, T.D.Bucher, J.J.Lawrie, L.Mdletshe, S.S.Ntshangase, A.A.Netshiya, P.Jones, L.Makhathini, K.L.Malatji, P.L.Masiteng, I.Ragnarsson, B.Maqabuka, J.Ndayishimye, O.Shirinda, B.R.Zikhali, S.Jongile, G.O'Neill, L.Msebi, P.M.Someketa, D.Kenfack, S.H.Mthembu, T.C.Khumalo, M.V.Chisapi

Low- and medium-spin negative-parity bands in the ¹⁸⁷Os nucleus

NUCLEAR REACTIONS ¹⁸⁶W(α, 3n)¹⁸⁷Os, E=37 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(ADO), γγ(linear polarization) using AFRODITE array of 11 Compton-suppressed HPGe clover detectors at the K=200 cyclotron facility of iThemba Labs. ¹⁸⁷Os; deduced high-spin levels, J, π, multipolarities, bands, alignment plots, experimental Routhians, Nilsson configurations; calculated total energy surfaces contours in (ϵ₂cos(γ+30°), ϵ₂sin(γ+30°)) plane using the cranked Nilsson-Strutinsky-Bogoliubov (CNSB) models. Bands interpreted within the cranked shell model (CSM) and CNSB formalism.

doi: 10.1103/PhysRevC.103.024325
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2021SI30      Phys.Rev. C 104, 044326 (2021)

M.A.Sithole, E.A.Lawrie, L.Mdletshe, S.N.T.Majola, A.Kardan, T.D.Bucher, J.F.Sharpey-Schafer, J.J.Lawrie, S.S.Ntshangase, A.A.Avaa, R.A.Bark, M.V.Chisapi, P.Jones, S.Jongile, D.Kenfack, T.C.Khumalo, L.Makhathini, K.L.Malatji, B.Maqabuka, S.H.Mthembu, L.Msebi, A.A.Netshiya, G.O'Neill, O.Shirinda, P.M.Someketa, B.R.Zikhali

Structure of collective states built on the 11/2⁺ isomer in ¹⁸⁷Os: Quasiparticle-plus-triaxial-rotor model and interpretation as tilted-precession bands

NUCLEAR REACTIONS ¹⁸⁶W(α, 3n)¹⁸⁷Os, E=37.0 MeV; measured Eγ, Iγ, γγ-coin, γγ(angular anisotropy), γγ(linear polarization) using AFRODITE array for γ detection at k=200 Separated Sector Cyclotron of iThemba LABS. ¹⁸⁷Os; deduced high-spin levels, J, π, multipolarities, rotational bands, tilted precession (TiP) bands, Nilsson configurations, alignment and Routhian plots, three-dimensional triaxially-deformed nucleus. Comparison with quasiparticle-plus-triaxial-rotor model calculations. Systematics of band structures of ^183,185,187Os and those of positive-parity bands in ^{182,184,186,188,190,192}Os.

doi: 10.1103/PhysRevC.104.044326
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2020AM04      Phys.Rev. C 102, 034319 (2020)

F.Amirzadeh, A.Kardan, P.M.Walker, H.-L.Ma

Isomeric and collective structures in neutron-rich hafnium isotopes

NUCLEAR STRUCTURE ¹⁷⁸Hf; calculated CNSB potential-energy surfaces in (ϵ₂, γ) plane for g.s., 6+, and two 8-, 14- and 16+ isomers, single-particle energies, level energies, g factors, pairing energies and isomeric state configurations. ^{178,180,182,184,186}Hf; calculated levels, J, π, energies of isomeric states, deformation parameters, configurations of multi-quasiparticle states, energies of the prolate collective, prolate noncollective, and the oblate collective states. ¹⁸⁰Hf; calculated CNSB potential-energy surfaces in (ϵ₂, γ) plane for states of spins 0, 14, 28, and 36. Paired cranked Nilsson-Strutinsky-Bogoliubov (CNSB), and the unpaired cranked Nilsson-Strutinsky (CNS) formalisms. Comparison with experimental data, and with predictions of total Routhian surface (TRS) model. Discussed high-spin shape coexistence.

doi: 10.1103/PhysRevC.102.034319
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2020KA05      Phys.Rev. C 101, 014323 (2020)

A.Kardan, I.Ragnarsson, B.G.Carlsson, H.-L.Ma

Interpretation of normal-deformed bands in ¹⁶⁷Lu

NUCLEAR STRUCTURE ¹⁶⁷Lu; calculated single-routhian orbitals at an average deformation for the normal-deformed bands, energies of unpaired and paired yrast and other bands of positive and negative configurations, spin versus Eγ distributions, average pairing energies relative to a rotating liquid drop, deformation trajectories, transition quadrupole moments, total energy surfaces in the (ϵ₂, γ) plane. Observed normal-deformed rotational structures in ¹⁶⁷Lu interpreted using unpaired and paired cranked Nilsson-Strutinsky (CNS) formalisms, cranked Nilsson-Strutinsky, and cranked Nilsson-Strutinsky-Bogoliubov (CNSB) calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.101.014323
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2020ZA01      Nucl.Phys. A997, 121716 (2020)

H.Zanganeh, A.Kardan, M.H.Hadizadeh-Yazdi

Fission-Barrier properties at the ground and high-spin states in the actinides

doi: 10.1016/j.nuclphysa.2020.121716
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2019AK06      Nucl.Phys. A990, 109 (2019)

M.Akbari, A.Kardan

Shape evolution and coexistence in neutron-deficient Kr, Rb, Sr and Zr nuclei

doi: 10.1016/j.nuclphysa.2019.07.004
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2019RO14      Phys.Rev. C 100, 024327 (2019)

W.Rodriguez, F.Cristancho, S.L.Tabor, A.Kardan, I.Ragnarsson, R.A.Haring-Kaye, J.Doring, D.G.Sarantites, A.Garzon

High spin states of the normally deformed bands of ⁸³Y

NUCLEAR REACTIONS ⁵⁸Ni(³²S, 3pα)⁸³Y, E=135 MeV; measured Eγ, Iγ, γγ-coin, level half-lives and side feedings by Doppler-shift attenuation method (DSAM) using Gammasphere array with 110 HPGe detectors surrounded by BGO Compton suppressors at the LBNL cyclotron facility. ⁸³Y; deduced high-spin levels, J, π, rotational bands, B(E2), β₂ deformation parameters, transition quadrupole moments, alignments; calculated total energy surfaces. Comparison with paired and unpaired cranked Nilsson-Strutinsky-Bogoliubov (CNSB), and with cranked Nilsson-Strutinsky (CNS) calculations.

doi: 10.1103/PhysRevC.100.024327
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2019SH45      Int.J.Mod.Phys. E28, 1950086 (2019)

S.Shohani, A.Kardan

Shape coexistence in even-even Po isotopic chain

NUCLEAR STRUCTURE ^{178,180,182,184,186,188,190,192,194,196,198,200}Po; calculated potential energy surfaces using the macroscopic-microscopic Nilsson-Strutinsky model; deduced shape phase transitions in the chain of Po isotopes.

doi: 10.1142/S0218301319500861
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2018TA27      Phys.Rev. C 98, 054313 (2018)

H.Taheri, A.Kardan, M.H.Hadizadeh-Yazdi

Normal-deformed structures in hafnium isotopes

NUCLEAR STRUCTURE ^{168,169,170,171,172,173,174,175}Hf; calculated single particle energies, rotational energy levels, moments of inertia, and alignments of yrast normal-deformed (ND) bands, modified Nilsson κ-μ parameters using Cranked Nilsson-Strutinsky (CNS) and Cranked Nilsson-Strutinsky-Bogoliubov (CNSB) models. Comparison with experimental data.

doi: 10.1103/PhysRevC.98.054313
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2017KA32      Int.J.Mod.Phys. E26, 1750044 (2017)

A.Kardan

Nuclear hexacontatetrapole deformation effects on the rotational structures at large deformations in ¹⁵⁸Er

NUCLEAR STRUCTURE ¹⁵⁸Er; calculated potential-energy surfaces versus quadrupole deformation and the triaxiality parameter, level energies. Cranked Nilsson-Strutinsky (CNS) approach, comparison with available data.

doi: 10.1142/S0218301317500446
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2017RA21      Rom.J.Phys. 62, 304 (2017)

M.Rabizadeh, A.Kardan

An Unpaired Study on the Isomeric States 8^-and 16⁺ in ¹⁷⁸Hf

2016KA23      Int.J.Mod.Phys. E25, 1650044 (2016)

A.Kardan, S.Sayyah

Shape evolution with angular momentum in Lu isotopes

NUCLEAR STRUCTURE ^{161,162,163,164,165,166,167,168,169}Lu; calculated deformation parameters, potential energy surfaces, single-particle neutron energies, excitation energies. The unpaired cranked Nilsson-Strutinsky method.

doi: 10.1142/S0218301316500440
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2016KA32      Int.J.Mod.Phys. E25, 1650047 (2016)

A.Kardan, S.Nejati

Nonaxial hexadecapole deformation effects on the fission barrier

NUCLEAR STRUCTURE ²⁵⁰Cf; calculated fission barrier as a function of deformation parameters.

doi: 10.1142/S0218301316500476
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2015RA04      Acta Phys.Pol. B46, 477 (2015)

I.Ragnarsson, B.G.Carlsson, A.Kardan, H.-L.Ma

Shape Coexistence, Triaxial Shape and Band Terminations at High Spin

NUCLEAR STRUCTURE ^125,126Xe, ¹⁶¹Lu, ¹⁶⁴Hf; calculated high-spin rotational bands. The configuration-constrained Cranked Nilsson-Strutinsky formalism with pairing neglected (CNS) and with pairing included (CNSB).

doi: 10.5506/APhysPolB.46.477
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2012GE04      Phys.Rev. C 86, 034304 (2012)

J.Gellanki, D.Rudolph, I.Ragnarsson, L.-L.Andersson, C.Andreoiu, M.P.Carpenter, J.Ekman, C.Fahlander, E.K.Johansson, A.Kardan, W.Reviol, D.G.Sarantites, D.Seweryniak, C.E.Svensson, J.C.Waddington

Extensive γ-ray spectroscopy of band structures in ₃₀⁶²Zn₃₂

NUCLEAR REACTIONS ²⁸Si(³⁶Ar, 2p), E AP 140 MeV; ⁴⁰Ca(²⁸Si, 2pα), E=122 MeV; measured Eγ, Iγ, γγ-, (particle)γ-coin, γγ(θ)(DCO). ⁶²Zn; deduced levels, J, π, normal deformation, well-deformed, terminating and superdeformed bands, multipolarity, mixing ratio, alignments, configurations. Comparison with cranked Nilsson-Strutinsky calculations.

doi: 10.1103/PhysRevC.86.034304
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2012KA22      Phys.Rev. C 86, 014309 (2012)

A.Kardan, I.Ragnarsson, H.Miri-Hakimabad, L.Rafat-Motevali

Interpretation of the large-deformation high-spin bands in select A=158-168 nuclei

NUCLEAR STRUCTURE ¹⁶⁸Hf, ¹⁵⁸Er, ^{161,163,164,165,167}Lu; calculated single-neutron and proton orbitals, levels, J, π of triaxial superdeformed (TSD) bands, potential-energy surface contours as function of quadrupole deformation and triaxiality parameter γ, total excitation energies, dynamic moments of inertia, relative alignments, configurations. Effects of inclusion of the hexadecapole degree of freedom. Configuration-constrained Cranked Nilsson-Strutinsky (CNS) calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.86.014309
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2012SI21      Phys.Rev. C 86, 067305 (2012)

P.Singh, A.K.Singh, A.N.Wilson, I.Ragnarsson, H.Hubel, A.Burger, M.P.Carpenter, S.Chmel, P.Fallon, G.B.Hagemann, B.Herskind, H.Ha, R.V.F.Janssens, K.Juhasz, A.Kardan, T.L.Khoo, F.G.Kondev, A.Korichi, T.Lauritsen, B.M.Nyako, J.Rogers, G.Sletten, J.Timar, S.Zhu

High-spin rotational bands in ¹²³I

NUCLEAR REACTIONS ⁸⁰Se(⁴⁸Ca, 4np)¹²³I, E=207 MeV; measured Eγ, Iγ, γγ-coin using Gammasphere array. ¹²³I; deduced high-spin levels, J, π, bands, alignments, configurations; calculated potential energy surface contours. Cranked Nilsson-Strutinsky model calculations.

doi: 10.1103/PhysRevC.86.067305
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2011OL02      Phys.Rev. C 83, 044309 (2011)

J.Ollier, J.Simpson, M.A.Riley, E.S.Paul, X.Wang, A.Aguilar, M.P.Carpenter, I.G.Darby, D.J.Hartley, R.V.F.Janssens, F.G.Kondev, T.Lauritsen, P.J.Nolan, M.Petri, J.M.Rees, S.V.Rigby, C.Teal, J.Thomson, C.Unsworth, S.Zhu, A.Kardan, I.Ragnarsson

Structure changes in ¹⁶⁰Er from low to ultrahigh spin

NUCLEAR REACTIONS ¹¹⁶Cd(⁴⁸Ca, 4n), E=215 MeV; measured Eγ, Iγ, γγ-coin, angular distributions using Gammasphere Spectrometer. ¹⁶⁰Er; deduced levels, J, π, rotational bands, triaxial strongly-deformed (TSD) bands, multipolarity, configurations, angular momentum alignments, B(M1)/B(E2) ratios, potential energy surfaces, dynamic moment of inertia plots, ultra-high spin regime. Comparison with cranked Nilsson-Strutinsky (CNS) calculations.

doi: 10.1103/PhysRevC.83.044309
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