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NSR database version of May 23, 2024.

Search: Author = A.D.Efimov

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2023EF01      Phys.Atomic Nuclei 86, 333 (2023)

A.D.Efimov, I.N.Izosimov

Peculiarities of Rotational Bands in Heavy and Superheavy Nuclei: Description of Yrast-Band States in 248Cm

NUCLEAR STRUCTURE 248Cm; calculated energy levels, J, π, B(E2), yrast bands using the microscopic version of the IBM1, with the elementary modes and effective factorized interaction on the basis of the spherical one-particle basis.

doi: 10.1134/S106377882304018X
Citations: PlumX Metrics


2021EF01      Phys.Atomic Nuclei 84, 408 (2021)

A.D.Efimov, I.N.Izosimov

Description of Yrast-Band States in 156Dy

NUCLEAR STRUCTURE 156Dy; calculated energy levels, J, π, yrast bands using an extended microscopic version of the interacting-boson model (IBM1).

doi: 10.1134/S1063778821040116
Citations: PlumX Metrics


2021EF02      Phys.Atomic Nuclei 84, 660 (2021)

A.D.Efimov, I.N.Izosimov

High-Spin States of Yrast Bands in Even Pu, Cm, Fm, and No Isotopes

NUCLEAR STRUCTURE 236,238,240,242,244Pu, 242,246,248Cm; calculated energy levels, J, π, B(E2), bands; deduced the interacting-boson model (IBM1) parameters.

doi: 10.1134/S1063778821050057
Citations: PlumX Metrics


2020EF01      Phys.Atomic Nuclei 83, 651 (2020)

A.D.Efimov

Theoretical Calculation of the IBM1 Parameters and Band Crossing in Even Cerium Isotopes

NUCLEAR STRUCTURE 122,124,126,128,130,132Ce; analyzed available data; calculated level energies, J, π, B(E2) using extended microscopic version of the interacting-boson model. Comparison with available data.

doi: 10.1134/S1063778820050105
Citations: PlumX Metrics


2019EF02      Bull.Rus.Acad.Sci.Phys. 83, 1136 (2019)

A.D.Efimov, V.M.Mikhajlov

Boson Description of Band Crossing in Even Barium Isotopes

doi: 10.3103/S1062873819090053
Citations: PlumX Metrics


2018EF01      Bull.Rus.Acad.Sci.Phys. 82, 1266 (2018)

A.D.Efimov, V.M.Mikhajlov

Microscopic Structure of the Yrast Bands in Even Xe Isotopes

NUCLEAR STRUCTURE 112,114,116,118,120,122,124,126,128Xe; calculated yrast states up to Iπ=18+ in the boson approximation of collective states (mainly the lowest-energy quadrupole phonons is considered with noncollective states including high-spin phonons); deduced smooth change in B(E2) values as spin increases, but a sharp transition from collective to noncollective band for isotopes of mass 122 and higher with bands intersection and B(E2) falling down substantially.

doi: 10.3103/S1062873818100064
Citations: PlumX Metrics


2016EF02      Bull.Rus.Acad.Sci.Phys. 80, 898 (2016)

A.D.Efimov, V.M.Mikhajlov

A variational approach to calculating IBM1 parameters and properties of even tellurium isotopes

NUCLEAR STRUCTURE 116,118,120,122,124,126,128Te; calculated IBM1 parameters using variational approach, 2+1 state quadrupole moment, gs energy, Q, yrast band state energy, J, π, B(E2). Compared with available data.

doi: 10.3103/S1062873816080116
Citations: PlumX Metrics


2013EF01      Bull.Rus.Acad.Sci.Phys. 77, 862 (2013); Izv.Akad.Nauk RAS, Ser.Fiz 77, 948 (2013)

A.D.Efimov, V.M.Mikhajlov

Microscopic description of absolute values for B(E2) within IBM

NUCLEAR STRUCTURE 122Te, 124Xe, 126Ba, 128Ce; calculated B(E2). Interacting Boson Model calculations, comparison with available data.

doi: 10.3103/S1062873813070101
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2012EF01      Bull.Rus.Acad.Sci.Phys. 76, 857 (2012); Izv.Akad.Nauk RAS, Ser.Fiz 76, 957 (2012)

A.D.Efimov, V.M.Mikhajlov

Microscopic description of the collective states in N = 70 isotones on the IBM basis

NUCLEAR STRUCTURE 122Te, 124Xe, 126Ba, 128Ce; calculated collective states energy levels, J, π. IBM model, comparison with available data.

doi: 10.3103/S1062873812080114
Citations: PlumX Metrics


2011EF03      Bull.Rus.Acad.Sci.Phys. 75, 890 (2011)

A.D.Efimov, V.M.Mikhajlov

Microscopic structure of 126Ba in IBM terms

NUCLEAR STRUCTURE 126Ba; calculated excited states for yrast band, valence states. Hamiltonian of the interacting boson model.

doi: 10.3103/S1062873811070136
Citations: PlumX Metrics


2009EF01      Bull.Rus.Acad.Sci.Phys. 73, 760 (2009); Izv.Akad.Nauk RAS, Ser.Fiz 73, 808 (2009)

A.D.Efimov, V.M.Mikhajlov

Quadrupole collectivity variations in even Hafnium isotopes

NUCLEAR STRUCTURE 156,158,160,162,164,166,168,170,172,174,176,178,180,182,184Hf; analyzed boson wave function; deduced correlations for spherical and deformed nuclei. Interacting boson model (IBM).

doi: 10.3103/S106287380906015X
Citations: PlumX Metrics


2008LI08      Eur.Phys.J. A 35, 135 (2008)

E.O.Lieder, A.A.Pasternak, R.M.Lieder, A.D.Efimov, V.M.Mikhajlov, B.G.Carlsson, I.Ragnarsson, W.Gast, Ts.Venkova, T.Morek, S.Chmel, G.de Angelis, D.R.Napoli, A.Gadea, D.Bazzacco, R.Menegazzo, S.Lunardi, W.Urban, Ch.Droste, T.Rzaca-Urban, G.Duchene, A.Dewald

Investigation of lifetimes in quadrupole bands of 142Gd

NUCLEAR REACTIONS 114Sn(32S, 2n2p), E=160 MeV; 99Ru(48Ti, 3n2p), E=240 MeV; measured Eγ, Iγ, γγ-coin, DSA. 142Gd deduced high-spin levels, J, π, B(E2), T1/2; calculated configurations with cranked Nilsson-Strutinsky and interacting boson models. Euroball III and IV arrays.

doi: 10.1140/epja/i2007-10533-0
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Data from this article have been entered in the XUNDL database. For more information, click here.


2006LI60      Phys.Scr. T125, 204 (2006)

E.O.Lieder, A.A.Pasternak, R.M.Lieder, A.D.Efimov, V.M.Mikhajlov, W.Gast, Ts.Venkova, G.de Angelis, D.R.Napoli, A.Gadea, D.Bazzacco, R.Menegazzo, S.Lunardi

Lifetimes in E2 bands of 142Gd measured with DSAM at EUROBALL

NUCLEAR REACTIONS 114Sn(32S, 2n2p), E=160 MeV; measured Eγ, Iγ, γγ-coin, DSA. 142Gd deduced high-spin levels, J, π, B(E2). Euroball array.

doi: 10.1088/0031-8949/2006/T125/052
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2004LI48      Eur.Phys.J. A 21, 37 (2004)

R.M.Lieder, A.A.Pasternak, E.O.Podsvirova, A.D.Efimov, V.M.Mikhajlov, R.Wyss, Ts.Venkova, W.Gast, H.M.Jager, L.Mihailescu, D.Bazzacco, S.Lunardi, R.Menegazzo C.R.Alvarez, G.de Angelis, D.R.Napoli, T.Rzaca-Urban, W.Urban, A.Dewald

Investigations of the level scheme of 144Gd and lifetimes in the quadrupole bands

NUCLEAR REACTIONS 100Mo(48Ti, 4n), E=215 MeV; 114Cd(36S, 6n), E=182 MeV; measured Eγ, Iγ, γγ-coin, DSA. 144Gd deduced high-spin levels, J, π, T1/2, B(E2), configurations. Euroball III and GASP arrays, interacting boson model calculations.

doi: 10.1140/epja/i2003-10181-4
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Data from this article have been entered in the XUNDL database. For more information, click here.


2002EF05      Ukr.J.Phys. 47, 118 (2002)

A.D.Efimov, Yu.N.Lobach, A.A.Pasternak, V.V.Tryshyn

Transition probabilities in intruder bands of even-mass Sn isotopes

NUCLEAR STRUCTURE 112,114,116,118Sn, 116,118,120,122Xe; analyzed rotational band transitions energies, B(E2); deduced identical bands features. Interacting boson model analysis.


2002PA19      Eur.Phys.J. A 13, 435 (2002)

A.A.Pasternak, J.Srebrny, A.D.Efimov, V.M.Mikhailov, E.O.Podsvirova, Ch.Droste, T.Morek, S.Juutinen, G.B.Hagemann, M.Piiparinen, S.Tormanen, A.Virtanen

Lifetimes in the Ground-State Band and the Structure of 118Te

NUCLEAR REACTIONS 109Ag(13C, 3np), E=54 MeV; measured Eγ, Iγ, γγ-coin, DSA. 118Te deduced high-spin levels T1/2, B(E2). Nordball array, recoil-distance and lineshape methods. Comparison with interacting boson-fermion model results.

doi: 10.1140/epja/iepja1221
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Data from this article have been entered in the XUNDL database. For more information, click here.


2002ZI06      Nucl.Phys. A712, 3 (2002)

M.Zielinska, T.Czosnyka, J.Choinski, J.Iwanicki, P.Napiorkowski, J.Srebrny, Y.Toh, M.Oshima, A.Osa, Y.Utsuno, Y.Hatsukawa, J.Katakura, M.Koizumi, M.Matsuda, T.Shizuma, M.Sugawara, T.Morikawa, H.Kusakari, A.D.Efimov, V.M.Mikhajlov

Electromagnetic structure of 98Mo

NUCLEAR REACTIONS 98Mo(20Ne, 20Ne'), E=50 MeV; 98Mo(84Kr, 84Kr'), E=250 MeV; 98Mo(136Xe, 136Xe'), E=614 MeV; measured Eγ, Iγ, (particle)γ-coin following Coulomb excitation. 98Mo deduced transitions E2 and M1 matrix elements, deformation, shape coexistence features. Comparison with IBM1 calculations.

doi: 10.1016/S0375-9474(02)01169-7
Citations: PlumX Metrics


2001EF04      Acta Phys.Pol. B32, 2591 (2001)

A.D.Efimov, A.A.Pasternak, D.N.Doinikov, V.M.Mikhailov, J.Srebrny

Is the Collective IBM Space Exhausted Only by the Valence Shell ?

NUCLEAR STRUCTURE 118Te, 120,128Xe, 156Gd; analyzed rotational bands transitions B(E2). Interacting boson model.


2001PA38      Acta Phys.Pol. B32, 2719 (2001)

A.A.Pasternak, A.D.Efimov, E.O.Podsvirova, V.M.Mikhailov, J.Srebrny, T.Morek, Ch.Droste, Y.Sasaki, M.Oshima, S.Juutinen, G.B.Hagemann

Electromagnetic E2 Transtion Probabilities in 120Xe and 118Te - N = 66 Nuclei

NUCLEAR REACTIONS 111Cd(12C, 3n), E=56 MeV; 109Ag(13C, 3np), E=54 MeV; measured Eγ, Iγ, γγ-coin, DSA. 120Xe, 118Te deduced transitions B(E2). Lineshape and recoil-distance techniques, comparisons with model predictions.

Data from this article have been entered in the XUNDL database. For more information, click here.


2000EF05      Bull.Rus.Acad.Sci.Phys. 64, 667 (2000)

A.D.Efimov, V.M.Mikhailov

Microscopic Nature of Boson Interaction in Transition Nuclei of Ba and Ce Isotopes

NUCLEAR STRUCTURE 126,128Ba, 130Ce; calculated levels, J, π, B(E2), wave functions, model parameters. IBM calculations, comparison with data.


2000PA63      Eur.Phys.J. A 9, 293 (2000)

A.A.Pasternak, Y.Sasaki, A.D.Efimov, V.M.Mikhailov, T.Hayakawa, Y.Toh, M.Oshima, Y.Hatsukawa, J.Katakura, N.Shinohara, Z.Liu, K.Furuno

DSA Lifetime Measurements and Structure of Positive-Parity Bands of 120Xe

NUCLEAR REACTIONS 111Cd(12C, 3n), E=56 MeV; measured Eγ, Iγ, γγ-coin, DSA. 120Xe deduced high-spin levels, J, π, T1/2, B(E2). Comparison with IBM calculations.

doi: 10.1007/s100500070011
Citations: PlumX Metrics

Data from this article have been entered in the XUNDL database. For more information, click here.


1999EF02      Phys.Rev. C59, 3153 (1999)

A.D.Efimov, V.M.Mikhailov

Phonon Mechanisms of Mixing Collective and Quasiparticle Excitations

NUCLEAR STRUCTURE 126,128Ba, 130Ce; calculated levels, J, π, B(E2). Phonon approach.

doi: 10.1103/PhysRevC.59.3153
Citations: PlumX Metrics


1999LO15      Eur.Phys.J. A 6, 131 (1999)

Yu.N.Lobach, A.D.Efimov, A.A.Pasternak

Lifetimes and Configuration Mixing in 110Cd

NUCLEAR REACTIONS 108Pd(α, 2n), E=25 MeV; measured Eγ, Iγ(θ), DSA. 110Cd deduced levels, J, π, T1/2, B(λ).

NUCLEAR STRUCTURE 110Cd; calculated levels, J, π, configurations, B(λ). Interacting boson model.

doi: 10.1007/s100500050327
Citations: PlumX Metrics


1998EF04      Yad.Fiz. 61, No 3, 401 (1998); Phys.Atomic Nuclei 61, 341 (1998)

A.D.Efimov, Yu.N.Lobach

Lifetimes and Structure of Excited States of 118Te

NUCLEAR REACTIONS 116Sn(α, 2n), E=27.2 MeV; measured Eγ, Iγ(θ), DSA. 118Te deduced levels, J, π, T1/2, B(E2), configurations.

NUCLEAR STRUCTURE 118Te; calculated levels, J, π, B(E2). Modified interacting boson model.


1998EF10      Bull.Rus.Acad.Sci.Phys. 62, 735 (1998)

A.D.Efimov, V.M.Mikhailov

Mixing Collective and Two-Quasiparticle States in a Region of First Backbending

NUCLEAR STRUCTURE 76,78Se, 126,132Ba, 130Ce; calculated levels, J, π, B(E2); deduced rotational band mixing features. Interacting boson-fermion model. Comparison with data.


1997EF06      Bull.Rus.Acad.Sci.Phys. 61, 522 (1997)

A.D.Efimov, V.M.Mikhailov

Mechanism for Interaction of Two-Quasiparticle and Collective States in the Band Crossing Region

NUCLEAR STRUCTURE 100,102,104Ru; calculated rotational bands levels, transition B(M1), B(E2); deduced hexadecapole forces role in band mixing. Interacting boson model.


1995EF01      Yad.Fiz. 58, No 1, 3 (1995); Phys.Atomic Nuclei 58, 1 (1995)

A.D.Efimov, M.F.Kudoyarov, A.S.Li, A.A.Pasternak, I.Adam, M.Honusek, A.Spalek

Lifetimes and Structure of Excited States of the 102Ru Yrast Band

NUCLEAR REACTIONS 100Mo(α, 2n), E=17-27 MeV; measured γ-spectra, γ(θ). 102Ru deduced levels, J, π, T1/2, B(λ). Interacting boson model.


1992EF02      Bull.Rus.Acad.Sci.Phys. 56, 96 (1992)

A.D.Efimov, V.M.Mikhailov

Microscopic Structure of Two-Photon Triplet States in Selenium Isotope Nuclei

NUCLEAR STRUCTURE 74,76,78Se; calculated two-phonon triplet state energies; deduced noncollective state role, model parameters. Microscopic approach, interacting boson model.


1991DO08      Nucl.Phys. A531, 326 (1991)

D.N.Doinikov, A.D.Efimov, K.I.Erokhina, V.M.Mikhailov

Interaction of Negative-Parity Phonons with Low-Frequency Quadrupole Mode

NUCLEAR STRUCTURE 76,78Se, 78,80,82Kr; calculated levels, B(λ). Interacting boson model.

doi: 10.1016/0375-9474(91)90615-D
Citations: PlumX Metrics


1990RO10      Nucl.Phys. A514, 401 (1990)

H.Rotter, J.Doring, L.Funke, L.Kaubler, H.Prade, R.Schwengner, G.Winter, A.E.Zobov, A.P.Grinberg, I.K.H.Lemberg, A.S.Mishin, L.A.Rassadin, I.N.Chugunov, A.D.Efimov, K.I.Erokhina, V.I.Isakov, L.O.Norlin, U.Rosengard

Yrast Spectroscopy of the N = 48 Nucleus 84Kr

NUCLEAR REACTIONS 82Se(α, 2n), E=12-27 MeV; measured Eγ, Iγ, I(ce), Iγ(E), Iγ(θ), γ(θ, H, t), γγ-, γγ(t)-coin, γ(t), γ-ray linear polarization, DSA, recoil distance. 84Kr deduced levels, J, π, ICC, T1/2, δ(E2/M1), B(λ), g-factor, configurations. Enriched tagets, Ge, Ge(Li), NaI(Tl), p-Si detectors. Shell-model calculations.

doi: 10.1016/0375-9474(90)90150-K
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1989AD01      Z.Phys. A332, 143 (1989)

J.Adam, M.Honusek, A.Spalek, D.N.Doinikov, A.D.Efimov, M.F.Kudojarov, I.Kh.Lemberg, A.A.Pasternak, O.K.Vorov, U.Y.Zhovliev

Lifetimes and Structure of 74Se Excited States

NUCLEAR REACTIONS 73Ge(α, 3nγ), E=40 MeV; 65Cu(12C, 2np), E=42 MeV; measured γ-spectra, DSA. 74Se deduced levels, T1/2, J, π, B(λ).


1989DO13      Izv.Akad.Nauk SSSR, Ser.Fiz. 53, 15 (1989); Bull.Acad.Sci.USSR, Phys.Ser. 53, No.1, 14 (1989)

D.N.Doinikov, K.I.Erokhina, A.D.Efimov, V.M.Mikhailov

Structure of Quasi-Rotational Bands of Negative Parity in Se and Kr Isotopes

NUCLEAR STRUCTURE 76Se, 78,80Kr; calculated levels, B(λ). Interacting boson model, two-quasiparticle configurations.


1987DO15      Izv.Akad.Nauk SSSR, Ser.Fiz. 51, 1944 (1987); Bull.Acad.Sci.USSR, Phys.Ser. 51, No.11, 62 (1987)

D.N.Doinikov, K.I.Erokhina, A.D.Efimov, U.I.Zhovliev, M.F.Kudoyarov, A.A.Pasternak

Lifetimes and Excited State Structure of 99Ru

NUCLEAR REACTIONS 96Mo(α, nγ), E=18 MeV; measured Eγ, Iγ. 99Ru deduced levels, J, π, T1/2, B(λ). Ge(Li) detector.


1987SC07      Z.Phys. A326, 287 (1987)

R.Schwengner, G.Winter, J.Doring, L.Funke, P.Kemnitz, E.Will, A.E.Sobov, A.D.Efimov, M.F.Kudojarov, I.Kh.Lemberg, A.S.Mishin, A.A.Pasternak, L.A.Rassadin, I.N.Chugunov

Collective and Two-Particle Excitations in 78Se

NUCLEAR REACTIONS 76Ge(α, 2n), E=16-27 MeV; measured Eγ, Iγ, σ(E, Eγ, θ), γγ-coin, linear polarization, DSA, γ(t), recoil distance Doppler shift. 78Se deduced levels, J, π, T1/2, B(λ). Enriched targets, Ge(Li) detectors.


1986ER03      Izv.Akad.Nauk SSSR, Ser.Fiz. 50, 78 (1986); Bull.Acad.Sci.USSR, Phys.Ser. 50, No.1, 76 (1986)

K.I.Erokhina, A.D.Efimov, V.M.Mikhailov

Extension of the Interacting Boson Model after Inclusion of Additional Quadrupole Excitation Mode

NUCLEAR STRUCTURE 82Kr; calculated levels, B(E2) ratios. Interacting boson model.


1985ER01      Yad.Fiz. 41, 596 (1985)

K.I.Erokhina, A.D.Efimov, I.Kh.Lemberg, V.M.Mikhailov

Investigation of Properties of Low-Lying States in Even Isotopes of Se Based upon the Model of Interacting Bosons

NUCLEAR STRUCTURE 70,72,74,76,78,80Se; calculated levels, B(λ). 72,74,76,78,80Se deduced shape characteristics.


1984EF01      Izv.Akad.Nauk SSSR, Ser.Fiz. 48, 10 (1984); Bull.Acad.Sci.USSR, Phys.Ser. 48, No.1, 8 (1984)

A.D.Efimov, K.I.Erokhina, V.G.Kiptilyi, I.Kh.Lemberg, V.M.Mikhailov, B.I.Rzhanov

Life Time of Collective States in 70Ge and the Interacting Boson Model

NUCLEAR REACTIONS 67Zn(α, nγ), E=10-16 MeV; 61Ni(12C, n2p), E not given; measured Eγ, Iγ, DSA. 70Ge deduced levels, J, π, γ-branching, T1/2, B(E2). Interacting boson model calculations.


1984ER02      Izv.Akad.Nauk SSSR, Ser.Fiz. 48, 328 (1984)

K.I.Erokhina, A.D.Efimov, I.Kh.Lemberg, A.K.Vlasnikov, V.M.Mikhailov

Description of Low-Lying Collective States of Even Kr Isotopes in the Interacting Boson Model

NUCLEAR STRUCTURE 74,82,84Kr; calculated levels. 76,78,80Kr; calculated levels, B(E2); deduced parameters. Interacting boson model.


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