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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 ^{236,238,240,242,244}Pu, ^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 ^{122,124,126,128,130,132}Ce; 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 ^{112,114,116,118,120,122,124,126,128}Xe; calculated yrast states up to I^π=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
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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 ^{116,118,120,122,124,126,128}Te; 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
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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 ^{156,158,160,162,164,166,168,170,172,174,176,178,180,182,184}Hf; 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), T_1/2; 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, T_1/2, 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 ^{112,114,116,118}Sn, ^{116,118,120,122}Xe; 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 T_1/2, 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
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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, T_1/2, 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, T_1/2, 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, T_1/2, 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, T_1/2, 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
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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, T_1/2, 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
Citations: PlumX Metrics

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, T_1/2, 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, T_1/2, 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, T_1/2, 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 ^{70,72,74,76,78,80}Se; calculated levels, B(λ). ^{72,74,76,78,80}Se 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, T_1/2, 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.