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NSR database version of April 29, 2024.

Search: Author = A.Dumitrescu

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2024DU06      Nuovo Cim. C 47, 44 (2024)

A.Dumitrescu, D.S.Delion

Interplay between strong, weak and electromagnetic interactions revealed by nuclear decay processes

RADIOACTIVITY ²⁰⁸Pb(α); calculated α-decay widths versus B(E2) values using he Hartree-Fock-Bogoliubov (HFB) method together with a residual nucleon-nucleon Surface Gaussian Interaction (SGI), a generalization of the well-known Surface Delta Interaction.

doi: 10.1393/ncc/i2024-24044-9
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2023DE26      Eur.Phys.J. A 59, 210 (2023)

D.S.Delion, A.Dumitrescu

Alpha-clustering and related phenomena in medium and heavy nuclei

NUCLEAR STRUCTURE ¹⁶⁴Dy, ¹⁶⁸Er, ¹⁷²Yb, ¹⁷⁶Hf, ¹⁸⁰W, ¹⁸⁴Os, ¹⁸⁸Pt, ¹⁹²Hg, ¹⁹⁶Pb, ²⁰⁰Po, ²⁰⁴Rn; analyzed available data; deduced even–odd staggering in pair binding energies along α-lines in terms of the so-called isospin pairing.

doi: 10.1140/epja/s10050-023-01105-5
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2023DU02      Phys.Rev. C 107, 024302 (2023)

A.Dumitrescu, D.S.Delion

Cluster mean-field description of α emission

RADIOACTIVITY ²⁴²Pu, ²⁶⁶Sg, ^264,270Hs, ²⁷⁰Ds, ^286,288Fl, ^290,292Lv, ²⁹⁴Og(α); calculated α-decay width Hartree-Fock-Bogoliubov (HFB) method with including a residual nucleon-nucleon surface Gaussian interaction (SGI) in order to describe the α-clustering in even-even nuclei. Comparison to experimental values.

NUCLEAR STRUCTURE A=150-250; analyzed experimental data on superfluid even-even α emitters ranging from rare earths to actinides and superheavy nuclei; deduced pairing strength systematics.

doi: 10.1103/PhysRevC.107.024302
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2022DU04      At.Data Nucl.Data Tables 145, 101501 (2022)

A.Dumitrescu, D.S.Delion

The phenomenology of particle and cluster emission

RADIOACTIVITY ¹⁰⁹I, ^112,113Cs, ¹¹⁷La, ^130,131Eu, ¹³⁵Tb, ^140,141Ho, ^{144,145,146,147}Tm, ^150,151Lu, ^155,156,157Ta, ^159,160,161Re, ^165,166,167Ir, ^170,171Au, ^176,177Tl, ¹⁸⁵Bi(p), ^106,108Te, ¹¹⁰Xe, ¹⁴⁴Nd, ^146,148Sm, ^148,150,152Gd, ¹⁵⁰Dy, ¹⁵⁴Dy, ^154,156Yb, ^156,158Hf, ^{158,160,162,164}W, ¹⁶²Os, ^{166,168,170,172}Os, ¹⁸⁶Os, ^{166,168,170,172,174,176,178}Pt, ¹⁹⁰Pt, ^{172,174,176,178,180,182,184}Hg, ¹⁸⁰Pb, ^186,188Pb, ^{188,190,192,194,196,198,200,202}Po, ^{206,208,210,212,214,216,218}Po, ^{194,196,198,200,202,204,206,208,210,212,214,216,218,220,222}Rn, ^{202,204,206,208,210,212,214,216,218,220,222,224,226}Ra, ^{210,212,214,216,218,220,222,224,226,228,230,232}Th, ²¹⁸U, ^{224,226,228,230,232,234,236,238}U, ^{232,234,236,238,240,242,244}Pu, ^{238,240,242,244,246,248}Cm, ^{240,242,244,246,248,250,252}Cf, ^{246,248,250,252,254,256}Fm, ^252,254,256No, ²⁵⁸Rf, ²⁶⁰Sg, ²⁶⁶Sg, ^264,266Hs, ²⁷⁰Hs, ²⁷⁰Ds, ^286,288Fl, ^290,292Lv, ²⁹⁴Og(α), ^222,224,226Ra(¹⁴C), ²²⁶Th(¹⁸O), ²²⁸Th(²⁰O), ²³⁰Th(²⁴Ne), ²³⁰U(²²Ne), ²³²Th(²⁴Ne), ²³²Th(²⁶Ne), ²³²U(²⁴Ne), ^232,234U(²⁸Mg), ²³⁴U(²⁴Ne), (²⁶Ne), ²³⁶Pu(²⁸Mg), ²³⁸Pu(³⁰Mg), ²³⁸Pu(²⁸Mg), ²³⁸Pu(³⁰Mg), ²⁴⁰Pu, ²⁴²Cm(³⁴Si); analyzed available data; calculated T_1/2; deduced impact of centrifugal and deformation effects within the Froman approach.

doi: 10.1016/j.adt.2022.101501
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2021DE12      Phys.Rev. C 103, 054325 (2021)

D.S.Delion, A.Dumitrescu

Universal proton emission systematics

RADIOACTIVITY ¹⁰⁹I, ^112,113Cs, ¹¹⁷La, ^130,131Eu, ¹³⁵Tb, ^{140,141,141m,144,145,145m,146,146m,147,147m}Ho, ^{150,150m,151,151m}Lu, ^{155,156,156m,157}Ta, ^{159,160,161,161m}Re, ^{164,165,166,166m,167,167m}Ir, ^{170,170m,171,171m}Au, ^176,177,177mTl, ¹⁸⁵Bi; compiled experimental data for J, π, l-transfers, Q values, T_1/2, β₂ and β₄ deformation parameters; analyzed proton systematics in terms of the barrier penetration and formation probability by approximating the realistic proton-core interaction by a parabolic dependence describing the nuclear part, and analytic WKB solutions for the wave functions in the regions of nuclear and Coulomb barriers; deduced nuclear centrifugal and deformation terms as much smaller than the corresponding Coulomb terms, and the Coulomb action one order of magnitude larger than the nuclear action term.

doi: 10.1103/PhysRevC.103.054325
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2020DE25      Phys.Rev. C 102, 014327 (2020)

D.S.Delion, A.Dumitrescu

Realistic analytical approach for α decay and clustering

RADIOACTIVITY Z=50-82, N=50-82(α); Z=50-82, N=82-126(α); Z=82-100, N=82-126(α); Z=82-100, N>126(α); Z>100, N>126(α); calculated radial parameters versus mass number, Coulomb parameters and fragmentation potentials versus neutron number, reduced widths versus number of α clusters, harmonic oscillator frequencies and length parameters versus mass number, lowest quartet number versus magic asymmetry for even-even and odd-A α emitters. Double folding procedure with parabolic dependence to derive the realistic α-core nuclear interaction between the inner turning point and the Coulomb barrier, and by including in the analysis α-decay experimental data for Q values and widths for 149 even-even α emitters.

doi: 10.1103/PhysRevC.102.014327
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2019DE23      Phys.Rev. C 100, 024331 (2019)

D.S.Delion, A.Dumitrescu, J.Suhonen

Effective axial-vector strength within proton-neutron deformed quasiparticle random-phase approximation

NUCLEAR STRUCTURE N=10-200; A=20-200; ⁷⁸Ge; analyzed experimental data for Gamow-Teller β transition strengths versus neutron number, ratios of transition amplitudes β^-/β^-(Fermi) and β⁺/β⁺(Fermi) versus mass number, and half-lives of 2β emitters; deduced effective axial-vector strength versus the particle-particle strength in ⁷⁸Ge, and versus mass number in even-even and odd-odd A=20-200 emitters for β^- and β⁺ transitions using pn-QRPA equations of motion, with projected angular momentum, and a schematic quadrupole-quadrupole residual interaction.

doi: 10.1103/PhysRevC.100.024331
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2018DE15      J.Phys.(London) G45, 053001 (2018)

D.S.Delion, Z.Ren, A.Dumitrescu, D.Ni

Coupled channels description of the α-decay fine structure

RADIOACTIVITY ²⁴⁶Cf, ²⁴²Cm, ²⁵³Fm, ²⁵¹Cf(α); calculated branching ratios, J, π, deformation parameters. Comparison with available data.

doi: 10.1088/1361-6471/aaac52
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2018DE21      Phys.Rev. C 97, 064303 (2018)

D.S.Delion, A.Dumitrescu, V.V.Baran

Theoretical investigation of α-like quasimolecules in heavy nuclei

NUCLEAR STRUCTURE ¹⁴⁴Nd; calculated vibrational resonant states and rotational bands built on them in the α+¹⁴⁰Ce molecular potential. Z>50, N=50-155; calculated monopole length parameter of g.s. channel, spectroscopic factors and absorption energy-integrated cross section of 162 even-even α emitters. Discussed experimental methods for determining α-like quasimolecular structure in heavy nuclei.

doi: 10.1103/PhysRevC.97.064303
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2016DE11      Phys.Rev. C 93, 044321 (2016)

D.S.Delion, A.Dumitrescu, V.V.Baran

Even-odd staggering of the spectroscopic factor as new evidence for α clustering

NUCLEAR STRUCTURE N=80-160, Z=70-100; calculated α spectroscopic factors for even Z nuclides of Ra, Th, U, Pu, Cm, Cf and Fm, and odd Z nuclides of Au, Bi, At, Fr, Ac, Pa, ratios between experimental and BCS spectroscopic factors, QQ coupling strength versus reduced width; deduced even-odd staggering in α spectroscopic factors, α clustering. Standard Bardeen-Cooper-Schrieffer (BCS) approach.

doi: 10.1103/PhysRevC.93.044321
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2016DU03      Phys.Rev. C 93, 024313 (2016)

A.Dumitrescu, D.S.Delion

Description of electromagnetic and favored α transitions in heavy odd-mass nuclei

NUCLEAR STRUCTURE ²²⁵Ra, ^223,225Ac, ^229,231Th, ^231,233Pa, ²³⁷U, ^235,237,239Np, ^239,241Pu, ^241,243,245Am, ^243,245,249Cm, ^{241,247,249,251}Bk, ^247,251,253Cf; calculated levels, J, π, bands, B(E2) using particle coupled to coherent state core model. Comparison with experimental values.

RADIOACTIVITY ²²⁵Ra, ^223,225Ac, ^229,231Th, ^231,233Pa, ²³⁷U, ^235,237,239Np, ^239,241Pu, ^241,243,245Am, ^243,245,249Cm, ^{241,247,249,251}Bk, ^247,251,253Cf(α); calculated half-lives and fine structure of favored α-transitions to first three members of rotational bands using coupled channels method and QQ interaction. Comparison with experimental values.

doi: 10.1103/PhysRevC.93.024313
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2015DE25      Phys.Rev. C 92, 021303 (2015)

D.S.Delion, A.Dumitrescu

Systematics of α-decay transitions to excited states

doi: 10.1103/PhysRevC.92.021303
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2015DU08      Rom.J.Phys. 60, 767 (2015)

A.Dumitrescu, D.S.Delion

Coherent State Description of the α-Emission Spectrum

2014DE43      At.Data Nucl.Data Tables 101, 1 (2014)

D.S.Delion, A.Dumitrescu

Systematics of the α-decay fine structure in even-even nuclei

RADIOACTIVITY ¹⁵⁴Er, ^156,158Yb, ^{158,160,162,164}Hf, ^{164,166,168,170}W, ^{164,166,168,170,172,174,176,178,180,182}Os, ^{168,170,172,174,176,178,180,182,184}Pt, ^{176,178,180,182,184,186,188,190}Hg, ^206,208Pb, ²¹⁴Pb, ^{192,194,196,198,200}Po, ²⁰²Po, ²⁰⁸Po, ^198,200Rn, ²⁰⁶Rn, ^{216,218,220,222}Rn, ²⁰⁸Ra, ^{218,220,222,224,226,228}Ra, ^{220,222,224,226,228,230,232,234}Th, ^{226,228,230,232,234,236,238,240}U, ^{234,236,238,240,242,244}Pu, ^{236,238,240,242,244,246,248}Cm, ^{242,244,246,248,250,252}Cf, ^248,250,252Fm, ^252,254No, ²⁵⁶Rf, ²⁶²Rf, ^260,262Sg, ²⁶⁶Sg, ²⁶⁶Hs, ²⁸⁰Ds, ²⁸⁴Cn, ²⁸⁸Fl, ²⁹⁰Lv(α);calculated energy levels, J, π, deformation parameters, B(E2), T_1/2. Comparison with available data, Coherent State Model (CSM).

doi: 10.1016/j.adt.2014.09.001
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2013DE12      Phys.Rev. C 87, 044314 (2013)

D.S.Delion, A.Dumitrescu

Unified description of electromagnetic and α transitions in even-even nuclei

RADIOACTIVITY ^172,174Os, ^176,178,180Pt, ^{196,198,216,218}Po, ^{216,218,220,222}Rn, ^{218,220,222,224}Ra, ^{222,224,226,228,230,232,234}Th, ^{230,232,234,236,238}U, ^{236,238,240,242,244}Pu, ^{242,244,246,248}Cm, ^248,250Cf(α); calculated β₂ and d deformation parameters, CSM parameter A₁, α-core QQ coupling parameter C, Iα to 2+, 4+ and 6+ states in daughter nuclei, rigidity parameter, E₄/E₂ and E₆/E₄ ratios, effective charge, hindrance factors using the coherent state model (CSM). Comparison with experimental data.

doi: 10.1103/PhysRevC.87.044314
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2013DE35      Rom.J.Phys. 58, 1167 (2013)

D.S.Delion, A.Dumitrescu

Coherent State Description of α-Transitions to Excited States in Even-Even Nuclei

NUCLEAR STRUCTURE N=126; calculated alpha-branching ratios to 2⁺ states, deformation parameters. Coherent state model.