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NSR database version of May 23, 2024.

Search: Author = P.O.Lipas

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2000OI04      Hyperfine Interactions 127, 431 (2000)

M.Oinonen, Y.Jading, U.Koster, J.Lettry, H.Ravn, J.Aysto, P.Dendooven, J.Huikari, A.Jokinen, P.O.Lipas, A.Nieminen, K.Perajarvi, T.Siiskonen, P.Baumann, A.Huck, A.Knipper, M.Ramdhane, G.Walter, F.Didierjean, V.N.Fedoseyev, V.I.Mishin, M.Koizumi, W.Liu, E.Roeckl, V.Sebastian, and the ISOLDE Collaboration

Laser ionization in β-decay studies of Zn and Mn nuclei

RADIOACTIVITY 58Zn(EC) [from Nb(p, X)]; measured Eγ, Iγ; deduced log ft. 58Cu levels deduced configurations. Resonance ionization laser ion source.

NUCLEAR REACTIONS Nb, U(p, X), E=1 GeV; measured yields of Mn and Zn isotopes. Resonance ionization laser ion source.

doi: 10.1023/A:1012617717682
Citations: PlumX Metrics

2000PE28      Phys.Lett. 492B, 1 (2000)

K.Perajarvi, T.Siiskonen, A.Honkanen, P.Dendooven, A.Jokinen, P.O.Lipas, M.Oinonen, H.Penttila, J.Aysto

Measurement of the IAS Resonance Strength in 23Mg

RADIOACTIVITY 23Al(EC), (β+p) [from 24Mg(p, 2n)]; measured Eγ, Iγ, β-delayed proton spectra, pγ-coin. 23Mg deduced levels, J, π, β-branching ratios, proton emission intensities, IAS resonance strength. Comparison with shell model. Mass-separated source.

NUCLEAR REACTIONS 24Mg(p, X)23Al/23Mg/20Na/24Al, E=40 MeV; measured production rates.

doi: 10.1016/S0370-2693(00)01074-1
Citations: PlumX Metrics

2000SI14      Phys.Rev. C61, 057302 (2000)

T.Siiskonen, P.O.Lipas

Tests of Shell-Model Truncation Methods

NUCLEAR STRUCTURE 28Si, 28Al, 40Mg; calculated binding energies, transitions B(E2). Shell model, truncation methods compared.

doi: 10.1103/PhysRevC.61.057302
Citations: PlumX Metrics

1999SI13      Phys.Rev. C60, 034312 (1999)

T.Siiskonen, P.O.Lipas, J.Rikovska

Shell-Model and Hartree-Fock Calculations for Even-Mass O, Ne, and Mg Nuclei

NUCLEAR STRUCTURE 18,20,22,24,26,28,30O, 18,20,22,24,26,28,30,32,34,36,38,40Ne, 20,22,24,26,28,30,32,34,36,38,40,42,44,46,48Mg; calculated binding energies, Q, μ, 2+ level energies. Shell model and Hartree-Fock approaches.

doi: 10.1103/PhysRevC.60.034312
Citations: PlumX Metrics

1998AX02      Nucl.Phys. A634, 475 (1998); Erratum Nucl.Phys. A641, 529 (1998)

L.Axelsson, J.Aysto, M.J.G.Borge, L.M.Fraile, H.O.U.Fynbo, A.Honkanen, P.Hornshoj, A.Jokinen, B.Jonson, P.O.Lipas, I.Martel, I.Mukha, T.Nilsson, G.Nyman, B.Petersen, K.Riisager, M.H.Smedberg, O.Tengblad, and the ISOLDE Collaboration

Beta Decay of 31Ar

RADIOACTIVITY 31Ar(β+p) [from 1 GeV p on CaO powder target]; measured βp-, βγ-coin, Ep, Ip. 31Cl deduced levels, branching, log ft, Gamow-Teller strength, IAS. OXBASH shell-model calculations, Gamow-Teller quenching, isospin mixing.

doi: 10.1016/S0375-9474(98)00172-9
Citations: PlumX Metrics

1998JO18      Eur.Phys.J. A 3, 271 (1998)

A.Jokinen, M.Oinonen, J.Aysto, P.Baumann, P.Dendooven, F.Didierjean, V.Fedoseyev, A.Huck, Y.Jading, A.Knipper, M.Koizumi, U.Koster, J.Lettry, P.O.Lipas, W.Liu, V.Mishin, M.Ramdhane, H.Ravn, E.Roeckl, V.Sebastian, G.Walter, and the ISOLDE Collaboration

Beta Decay of the MT = -1 Nucleus 58Zn Studied by Selective Laser Ionization

RADIOACTIVITY 58Zn(β+) [from Nb(p, X), E=1 GeV]; measured Eγ, Iγ, βγ-coin, T1/2. 58Cu levels deduced branching, Gamow-Teller strengths. Laser ion source. Comparison with reaction data. Shell model calculations.

doi: 10.1007/s100500050177
Citations: PlumX Metrics

1998JO20      Nuovo Cim. 111A, 1083 (1998)

A.Jokinen, J.Aysto, P.Dendooven, S.Hankonen, A.Honkanen, J.Huikari, G.Lhersonneau, P.O.Lipas, H.Penttila, K.Perajarvi, M.Oinonen, A.Nieminen, T.Siiskonen, J.C.Wang

High-Resolution Studies of Beta-Delayed Proton Emitters at IGISOL Facility

RADIOACTIVITY 23Al(β+) [from 24Mg(p, 2n)]; measured Eγ, Iγ, β-delayed proton spectra. 23Mg deduced IAS resonance strength. 41Ti(β+) [from 40Ca(3He, 2n)]; measured β-delayed proton spectra. 41Sc deduced Gamow-Teller strength distribution. Mass-separated sources.

doi: 10.1007/BF03035996
Citations: PlumX Metrics

1997HO12      Nucl.Phys. A621, 689 (1997)

A.Honkanen, P.Dendooven, M.Huhta, G.Lhersonneau, P.O.Lipas, M.Oinonen, J.-M.Parmonen, H.Penttila, K.Perajarvi, T.Siiskonen, J.Aysto

High-Resolution Study of the Beta Decay of 41Ti

RADIOACTIVITY 41Ti(β+) [from 40Ca(3He, 2n), E=40 MeV]; measured β-delayed Ep, Ip, γ spectra; deduced log ft, 41Sc deduced Gamow-Teller strength, isospin mixing. OXBASH shell-model calculations. ΔE(gas)E(Si) telescope, Si, hyperpure Ge, plastic scintillator detectors.

doi: 10.1016/S0375-9474(97)00180-2
Citations: PlumX Metrics

1995KO33      Nucl.Phys. A591, 421 (1995)

M.Koskinen, P.O.Lipas, M.Manninen

Unrestricted Shapes of Light Nuclei in the Local-Density Approximation: Comparison with jellium clusters

NUCLEAR STRUCTURE Z=2-22; N=2-22; calculated total energy per particle, intrinsic quadrupole moments. Density functional theory, Kohn-Sham method, local-density approximation.

doi: 10.1016/0375-9474(95)00209-J
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1992FU04      Nucl.Phys. A541, 241 (1992)

L.Funke, G.Winter, J.Doring, L.Kaubler, H.Prade, R.Schwengner, Ch.Protochristov, W.Andrejtscheff, L.G.Kostova, P.O.Lipas, R.Wirowski

Neutron-Core Excitations in the N = 50 Nucleus 89Y

NUCLEAR REACTIONS 87Rb(α, 2n), E=16-27 MeV; measured Eγ, Iγ, σ(E, Eγ, θ), γγ-coin, γ-ray linear polarization, DSA, γ(t). 89Y deduced levels, J, π, T1/2, δ(E2/M1), B(λ). Enriched targets, Ge detectors. Shell model description.

doi: 10.1016/0375-9474(92)90096-3
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1991LI09      J.Phys.(London) G17, 971 (1991); Corrigenda J.Phys.(London) G17, 1943 (1991)

P.O.Lipas, H.Harter, R.Nojarov, A.Faessler, M.Koskinen

Boson-Model M1 Form Factors for Inelastic Electron Scattering on 130,132,134Ba

NUCLEAR STRUCTURE 130,132,134Ba, 164Dy; calculated transition current densities. Proton-neutron interacting boson model.

NUCLEAR REACTIONS 130,132,134Ba, 164Dy(e, e'), E not given; calculated form factors. Proton-neutron interacting boson model.

doi: 10.1088/0954-3899/17/6/017
Citations: PlumX Metrics

1991NO04      Nucl.Phys. A533, 381 (1991); Erratum Nucl.Phys. A537, 707 (1992)

R.Nojarov, A.Faessler, P.O.Lipas

M1 Strength and (e, e') Form Factors of 46,48Ti within the RPA

NUCLEAR STRUCTURE 46,48Ti; calculated B(M1). Quasiparticle RPA.

NUCLEAR REACTIONS 46,48Ti(e, e'), E not given; calculated transition current densities. Quasiparticle RPA, deformed Woods-Saxon potential.

doi: 10.1016/0375-9474(91)90524-A
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1990FR15      J.Phys.(London) G16, 1653 (1990)

W.Frank, P.O.Lipas

General Projection from IBA-2 to IBA-1

NUCLEAR STRUCTURE A ≈ 50; calculated δ(E2/M1). 54Cr, 58Fe, 46Ti; analyzed δ(E2/M1); deduced F-spin multiplets. F-spin analysis.

doi: 10.1088/0954-3899/16/11/015
Citations: PlumX Metrics

1990LI07      Nucl.Phys. A509, 509 (1990)

P.O.Lipas, M.Koskinen, H.Harter, R.Nojarov, A.Faessler

Microscopic IBA Calculations of (e, e') M1 Form Factors

NUCLEAR STRUCTURE 154Sm, 154,156,158Gd, 164Dy, 168Er; calculated B(M1), g-factors. 164Dy; calculated form factors. Microscopic interacting boson model.

doi: 10.1016/0375-9474(90)90089-5
Citations: PlumX Metrics

1990LI31      J.Phys.(London) G16, 1669 (1990)

P.O.Lipas, A.Gelberg

Quadratic M1 Operator in the IBA

NUCLEAR STRUCTURE 162,164,166,168Er; calculated quadratic M1 operator related parameters. Interacting boson model, U(5) limit.

doi: 10.1088/0954-3899/16/11/016
Citations: PlumX Metrics

1989LI20      Phys.Lett. 230B, 1 (1989)

P.O.Lipas, M.Koskinen, H.Harter, R.Nojarov, A.Faessler

Magnetic Dipole Transitions and Spin Currents in Inelastic Electron Scattering

NUCLEAR STRUCTURE 164Dy; calculated M1 transition current density. Microscopic interacting boson approximation.

doi: 10.1016/0370-2693(89)91642-0
Citations: PlumX Metrics

1988HA18      Phys.Lett. 205B, 175 (1988)

H.Harter, P.O.Lipas, R.Nojarov, Th.Taigel, A.Faessler

Isovector States in 128-134Ba

NUCLEAR STRUCTURE 128,130,132,134Ba; calculated levels, B(λ), β2, pairing gaps, quadrupole moments. 130,132,134Ba deduced doublet. Interacting boson model.

1988VA04      Nucl.Phys. A476, 301 (1988)

P.Van Isacker, P.O.Lipas, K.Helimaki, I.Koivistoinen, D.D.Warner

IBM-2 Description of M1 Properties in Deformed Nuclei

NUCLEAR STRUCTURE 152Sm, 154,156Gd, 160,162Dy, 166,168Er, 184W; calculated B(E2) ratios, M1 reduced matrix elements.

doi: 10.1016/0375-9474(88)90486-1
Citations: PlumX Metrics

1987LI11      Nucl.Phys. A469, 348 (1987)

P.O.Lipas, P.Toivonen, E.Hammaren

IBA-1 Calculations of E2/M1 Mixing Ratios

NUCLEAR STRUCTURE 146,148,150,152Sm, 152,154,156Gd, 162Dy, 162,164,166,168Er, 172Yb, 190Os; calculated levels, δ(E2/M1). Interacting boson approximation.

doi: 10.1016/0375-9474(87)90115-1
Citations: PlumX Metrics

1986PA14      J.Phys.(London) G12, 1047 (1986)

A.Passoja, J.Kantele, M.Luontama, R.Julin, E.Hammaren, P.O.Lipas, P.Toivonen

Electromagnetic Decay of 02+ and O3+ States in the N = 88-90 Nuclei of 150,152Sm

RADIOACTIVITY 152m,150mEu(EC), (β+), (β-) [from 150Sm(p, n), E=9.5 MeV; 151Eu(n, γ), E=thermal]; measured Iγ, Eγ, I(ce), I(ce)(X-ray)-coin. 150,152Sm deduced levels, J, π, B(λ), E0 strength parameter. Enriched targets, Ge(Li) detectors, magnetic plus Si-Li conversion electron spectrometer. Interacting boson model.

doi: 10.1088/0305-4616/12/10/013
Citations: PlumX Metrics

1985LI10      Phys.Lett. 155B, 295 (1985)

P.O.Lipas, P.Toivonen, D.D.Warner

IBA Consistent-Q Formalism Extended to the Vibrational Region

NUCLEAR STRUCTURE 152Gd; calculated level energy, B(E2) ratios. Interacting boson approximation model, vibrational region extension.

doi: 10.1016/0370-2693(85)91573-4
Citations: PlumX Metrics

1985LI20      Phys.Lett. 165B, 244 (1985)

P.O.Lipas, K.Helimaki

IBA-2 Calculation of E2/M1 Mixing Ratios in 156Gd

NUCLEAR STRUCTURE 156Gd; calculated levels, B(λ), δ(E2/M1). Interacting boson model.

doi: 10.1016/0370-2693(85)91222-5
Citations: PlumX Metrics

1985SU01      Phys.Lett. 150B, 327 (1985)

J.Suhonen, P.O.Lipas

An Extended Phonon Projection Model for Even-Even Nuclei

NUCLEAR STRUCTURE 148,150,152Sm; calculated levels, B(E2). Extended phonon projection model.

doi: 10.1016/0370-2693(85)90986-4
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1985SU08      Nucl.Phys. A442, 189 (1985)

J.Suhonen, P.O.Lipas

Extended Phonon Projection Model and Its Application to the Mass Region A = 142-174

NUCLEAR STRUCTURE 146,148,150,152,154Sm; calculated levels, B(E2), spectroscopic quadrupole moments. Extended phonon projection model.

doi: 10.1016/0375-9474(85)90141-1
Citations: PlumX Metrics

1984KR02      J.Phys.(London) G10, 571 (1984)

T.I.Kracikova, M.Finger, V.N.Pavlov, V.A.Deryuga, P.O.Lipas, E.Hammaren, P.Toivonen

Nuclear Orientation Study of the Decay of 146Eu

RADIOACTIVITY 146Eu(EC), (β+) [from Er(p, X), E=660 MeV]; measured γ(θ), oriented nuclei; deduced orientation coefficients. 146Sm deduced levels, J, π, δ, B(λ), X(E0/E2). Interacting boson approximation model.

doi: 10.1088/0305-4616/10/4/017
Citations: PlumX Metrics

1984KR09      J.Phys.(London) G10, 667 (1984)

T.I.Kracikova, M.Finger, J.Konicek, N.A.Lebedev, V.A.Deryuga, P.O.Lipas, E.Hammaren, P.Toivonen

Nuclear Orientation Study of the Decay of 148Eu

NUCLEAR STRUCTURE 148Sm; calculated levels, δ, B(E2), X(E0/E2), quasirotational band structure. Interacting boson model.

RADIOACTIVITY 148Eu(EC), (β+), (α) [from Er(p, X), E=660 MeV]; measured γ(θ), oriented nuclei. 148Sm deduced levels, J, π, δ, X(E0/E2). Interacting boson model.

doi: 10.1088/0305-4616/10/5/010
Citations: PlumX Metrics

1984KR14      J.Phys.(London) G10, 1115 (1984)

T.I.Kracikova, S.Davaa, M.Finger, M.I.Fominykh, W.D.Hamilton, P.O.Lipas, E.Hammaren, P.Toivonen

Nuclear Orientation Study of the Decay of 172Lu

RADIOACTIVITY 172Lu(EC) [from Ta(p, X)172Hf(EC-decay)]; measured Eγ, Iγ, γ(θ), oriented nuclei. 172Yb levels deduced J, π, γ-branching, δ, X(E0/E2), monopole transition density. Mass separated source implantation in Gd, Fe, 3He-4He dilution refrigerator, Ge(Li) detectors. Interacting boson model.

doi: 10.1088/0305-4616/10/8/016
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1984LI06      Phys.Lett. 139B, 10 (1984)

P.O.Lipas, E.Hammaren, P.Toivonen

IBA-1 Calculation of E2/M1 Mixing Ratios in 154Gd

NUCLEAR STRUCTURE 154Gd; calculated reduced (E2/M1) mixing ratio. Generalized interacting boson approximation.

doi: 10.1016/0370-2693(84)90023-6
Citations: PlumX Metrics

1984LI13      ATOMKI Kozlem. 26, 93 (1984)


IBA Calculations of Multipole Mixing Ratios

NUCLEAR STRUCTURE 146,148,150,152Sm, 154Gd, 162Dy, 162,164,166,168Er, 172Yb; calculated B(λ), δ, X(E0/E2). Interacting boson model.

1983LI06      Phys.Scr. 27, 8 (1983)

P.O.Lipas, J.Kumpulainen, E.Hammaren, T.Honkaranta, M.Finger, T.I.Kracikova, I.Prochazka, J.Ferencei

Study of Even Gd Nuclei by Decay of Oriented Tb, with Analysis by Simple Boson Models

NUCLEAR STRUCTURE 150,152,154,156,158,160Gd; calculated levels, B(E2), monopole transition densities, B(E2)/B(E0). Interacting boson model.

RADIOACTIVITY 150,152,154Tb(EC), (β+), 156Tb(EC) [from Ta(p, X), E=660 MeV]; measured γ(θ), oriented nuclei. 150,152,154,156Gd deduced levels, J, π, γ-multipolarity, δ, rotational band characteristics. TbGd samples, dilution refrigeration. Interacting boson model.

doi: 10.1088/0031-8949/27/1/002
Citations: PlumX Metrics

1983PA05      Phys.Lett. 124B, 157 (1983)

A.Passoja, J.Kantele, M.Luontama, J.Kumpulainen, R.Julin, P.O.Lipas, P.Toivonen

Disproof of the Alleged Two-Phonon Character of the O+2 State in 64Zn

RADIOACTIVITY 64Ga(β+), (EC); measured I(ce). 64Zn deduced level.

NUCLEAR REACTIONS 64Zn(p, p'), E=5.9-6.9 MeV; measured Eγ, Iγ, γp-coin. 64Zn deduced γ-branching, B(E2), B(E0)/B(E2), monopole transition strengths, 0+ level T1/2. Discussed inadequacy of existing nuclear models.

doi: 10.1016/0370-2693(83)91425-9
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1976LI21      Phys.Scr. 13, 339 (1976)

P.O.Lipas, P.Haapakoski, T.Honkaranta

A Unified Phenomenological Description of Quadrupole Excitations in Even-Even Nuclei

NUCLEAR STRUCTURE 152Sm, 152Gd, 114Cd; calculated levels, K, quadrupole moment, B(E2). Unified phenomenological description.

doi: 10.1088/0031-8949/13/6/003
Citations: PlumX Metrics

1972FO24      Phys.Scr. 6, 259 (1972)

T.Fogel, P.Haapakoski, P.O.Lipas

A Phonon Cranking Model

doi: 10.1088/0031-8949/6/5-6/010
Citations: PlumX Metrics

1972GU09      Phys.Lett. 40A, 297 (1972)

D.F.Gumprecht, T.E.Katila, L.C.Moberg, P.O.Lipas

A Mossbauer Observation of the Magnetic Moment of the 89 keV Excited State of 119Sn

NUCLEAR REACTIONS 119Sn(γ, γ), E=89 keV; measured Mossbauer effect. 119Sn level deduced μ.

doi: 10.1016/0375-9601(72)90579-8
Citations: PlumX Metrics

1972LI35      Comment.Phys.-Math. 42, 251 (1972)

P.O.Lipas, T.Honkaranta

Nuclear Projection Model with Anisotropy

NUCLEAR STRUCTURE 152Sm; calculated levels.

1970HA17      Phys.Lett. 31B, 493 (1970)

P.Haapakoski, T.Honkaranta, P.O.Lipas

Projection Model for Ground Bands of Even-Even Nuclei

NUCLEAR STRUCTURE 152Gd, 152Sm; calculated ground-state bands. Peierls-Yoccoz angular momentum projection method.

doi: 10.1016/0370-2693(70)90071-7
Citations: PlumX Metrics

1970RA15      Nucl.Phys. A149, 11 (1970)

A.Raduta, A.Sandulescu, P.O.Lipas

Semi-Microscopic Theory of Two-Phonon Quadrupole-Octupole Vibrations in Spherical Nuclei

NUCLEAR STRUCTURE 114Sn; calculated levels, two-phonon quadrupole-octupole vibrations.

doi: 10.1016/0375-9474(70)90374-X
Citations: PlumX Metrics

1968HO28      Nucl.Phys. A117, 552 (1968)

P.Holmberg, P.O.Lipas

A New Formula for Rotational Energies

NUCLEAR STRUCTURE 158Dy, 166Hf, 172,180W, 152Sm, 154,156Gd, 170Hf, 184Pt, 238U, 122Xe, 126Ba; calculated ground-state rotational bands. Hydrodynamic model.

doi: 10.1016/0375-9474(68)90830-0
Citations: PlumX Metrics

1963LI02      Nucl.Phys. 40, 629 (1963)


Vibrational E1, E2 and E3 Transitions in Deformed Even Nuclei

doi: 10.1016/0029-5582(63)90307-9
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