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Search: Author = S.A.Alavi

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2023BE25      Eur.Phys.J. A 59, 221 (2023)

Kh.Benam, V.Dehghani, S.A.Alavi

Thermal properties of ⁹⁷Mo and ⁹⁰Y nuclei using temperature dependent level density parameter

NUCLEAR STRUCTURE ⁹⁷Mo, ⁹⁰Y; calculated gap parameter and order parameter, excitation energies, Shlomo level density parameter, single particle level density with Thomas Fermi approximation; deduced the temperature dependent level density parameter.

doi: 10.1140/epja/s10050-023-01130-4
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2022DE14      Chin.Phys.C 46, 044104 (2022)

V.Dehghani, S.A.Alavi, R.Razavi, A.Soylu, F.Koyuncu

Cluster decay half-lives using asymmetry dependent densities

RADIOACTIVITY ²²¹Fr, ^{221,222,223,224}Ra, ²²⁶Ra, ²²⁶Th(¹⁴C), ²²⁶Th(¹⁸O), ²²⁸Th(²⁰O), ²³⁰Th(²⁴Ne), ²³²Th(²⁶Ne), ²³¹Pa(²³F), (²⁴Ne), ²³⁰U(²²Ne), (²⁴Ne), ²³²U(²⁴Ne), (²⁸Mg), ²³³U(²⁴Ne), (²⁵Ne), (²⁸Mg), ²³⁴U(²⁴Ne), (²⁶Ne), (²⁸Mg), ²³⁵U(²⁴Ne), (²⁵Ne), (²⁸Mg), ²³⁶U(²⁴Ne), (²⁶Ne), (³⁰Mg), ²³⁷Np(³⁰Mg), ²³⁶Pu(²⁸Mg), ²³⁸Pu(²⁸Mg), (³⁰Mg), (³²Si), ²⁴⁰Pu, ²⁴¹Am(³⁴Si); calculated T_1/2. Comparison with available data.

doi: 10.1088/1674-1137/ac4035
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2022GH03      Eur.Phys.J. A 58, 12 (2022)

F.Ghorbani, S.A.Alavi, V.Dehghani

Alpha decay half-lives of even-even nuclei using alpha-folding interaction

RADIOACTIVITY ¹⁰⁸Te, ¹¹²Xe, ¹⁴⁸Sm, ¹⁴⁸Gd, ¹⁵²Gd, ¹⁵²Er, ¹⁵²Dy, ¹⁵⁶Yb, ¹⁵⁶Hf, ¹⁶⁰W, ¹⁶⁸Pt, ¹⁷⁶Pt, ¹⁸⁰Pt, ¹⁸⁴Pt, ¹⁸⁸Pt, ¹⁷⁶Hg, ¹⁸⁰Hg, ¹⁸⁴Hg, ¹⁸⁸Hg, ¹⁸⁸Pb, ¹⁹²Po, ¹⁹⁶Po, ²⁰⁰Po, ²⁰⁴Po, ²⁰⁸Po, ²¹²Po, ²¹⁶Po, ¹⁹⁶Rn, ²⁰⁰Rn, ²¹²Rn, ²²⁰Rn, ²⁰⁴Ra, ²⁰⁸Ra, ²¹²Ra, ²²⁰Ra, ²²⁴Ra, ²¹⁶Th, ²²⁴Th, ²²⁸Th, ²³²Th, ²²⁴U, ²²⁸U, ²³²U, ²³⁶U, ²³²Pu, ²³⁶Pu, ²⁴⁰Pu, ²⁴⁴Pu, ²⁴⁰Cm, ²⁴⁴Cm, ²⁴⁸Cm, ²⁴⁰Cf, ²⁴⁴Cf, ²⁴⁸Cf, ²⁵²Cf, ²⁴⁸Fm, ²⁵²Fm, ²⁵⁶Fm(α); calculated T_1/2 using WKB method and including Bohr-Sommerfeld quantization for nuclear potential. Comparison with available data.

doi: 10.1140/epja/s10050-022-00670-5
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2022SO12      Int.J.Mod.Phys. E31, 2250062 (2022)

A.Soylu, F.Koyuncu, S.A.Alavi, V.Dehghani

Calculations on the proton decay with modified preformation probability

RADIOACTIVITY ^{144,145,146,147}Tm, ^150,151Lu, ^155,156,157Ta, ^159,160,161Re, ^{164,165,166,167}Ir, ^170,171Au, ^176,177Tl(p); calculated T_1/2. Comparison with available data.

doi: 10.1142/S0218301322500628
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2021GH01      Nucl.Phys. A1006, 122111 (2021)

F.Ghorbani, S.A.Alavi, V.Dehghani

Alpha decay half lives of spherical even-even nuclei: Role of repulsive core

RADIOACTIVITY ^106,108Te, ^146,148Sm, ^148,150Gd, ^150,152Dy, ^152,154Er, ¹⁵⁴Yb, ¹⁵⁶Hf, ¹⁵⁸W, ²¹⁰Pb, ^{190,192,194,196,198,200,202,204,206,208,210,212,214,216,218}Po, ^{208,210,212,218,220}Rn, ^214,220Ra, ²¹⁸Th(α); calculated T_1/2. Comparison with available data.

doi: 10.1016/j.nuclphysa.2020.122111
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2021HO01      Can.J.Phys. 99, 24 (2021)

M.Hosseini-Tabatabaei, S.A.Alavi, V.Dehghani

Systematic of alpha decay half-lives: role of quantization condition

RADIOACTIVITY ¹⁶²W, ¹⁸⁶Pb, ²⁰⁸Ra, ²³⁸U, ²⁹⁴Og(α); calculated mean assault frequency, tunneling probabilities, T_1/2. Comparison with available data.

doi: 10.1139/cjp-2019-0586
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2021SO20      Chin.Phys.C 45, 044108 (2021)

A.Soylu, F.Koyuncu, G.Gangopadhyay, V.Dehghani, S.A.Alavi

Proton radioactivity half-lives with nuclear asymmetry factor

RADIOACTIVITY ¹⁰⁹I, ^112,113Cs, ¹¹⁷La, ¹²¹Pr, ^130,131Eu, ¹³⁵Tb, ^140,141Ho, ^{144,145,146,147}Tm, ^150,151Lu, ^155,156,157Ta, ^159,160,161Re, ^164,166,167Ir, ^170,171Au, ^176,177Tl(p), ¹⁴¹Ho, ^146,147Tm, ^150,151Lu, ¹⁵⁶Ta, ^159,161Re, ^165,166,167Ir, ^170,171Au, ¹⁷⁷Tl, ²¹⁵Bi(IT), (p); analyzed available data; deduced the dependence of proton emission T_1/2 on the nuclear asymmetry parameter.

doi: 10.1088/1674-1137/abe03f
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2020GH06      Phys.Rev. C 102, 014610 (2020)

F.Ghorbani, S.A.Alavi, V.Dehghani, A.Soylu, F.Koyuncu

Heavy ion fusion reaction cross section: Analysis of the temperature dependence of the repulsive nuclear potential

NUCLEAR REACTIONS ⁶³Cu(¹⁸O, X), E(cm)=30-52 MeV; ¹⁹⁴Pt(¹⁸O, X), E(cm)=71-90 MeV; ²⁰⁸Pb(¹⁶O, X), E(cm)=70-100 MeV; ¹⁴¹Pr(¹²C, X), E(cm)=45-100 MeV; calculated repulsive nuclear potential strength as function of temperature, fusion parameters and barrier heights, fusion σ(E) using Wong formula with double-folding potentials (M3Y) and corrected temperature-dependent repulsive nuclear potential. Comparison with experimental data.

doi: 10.1103/PhysRevC.102.014610
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2020GH10      Nucl.Phys. A1002, 121947 (2020)

F.Ghorbani, S.A.Alavi, V.Dehghani

Temperature dependence of the alpha decay half-lives of even-even Th isotopes

RADIOACTIVITY ^{210,212,214,216,218,220,222,224,226,228,230,232}Th(α); calculated T_1/2. Comparison with experimental values.

doi: 10.1016/j.nuclphysa.2020.121947
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2020SO24      Acta Phys.Pol. B51, 2125 (2020)

A.Soylu, F.Koyuncu, S.A.Alavi, V.Dehghani

Proton-radioactivity Half-life Formulas with Isospin and Shell Effects

RADIOACTIVITY ¹⁰⁹I, ^112,113Cs, ¹¹⁷La, ¹²¹Pr, ^130,131Eu, ¹³⁵Tb, ^140,141Ho, ^{144,145,146,147}Tm, ^150,151Lu, ^155,156,157Ta, ^159,160,161Re, ¹⁶⁴Ir, ^166,167Ir, ¹⁷⁰Au, ^176,177Tl(p), ¹⁴¹Ho, ^146,147Tm, ^150,151Lu, ¹⁵⁶Ta, ¹⁵⁹Re, ¹⁶¹Re, ^165,166,167Ir, ^170,171Au, ¹⁷⁷Tl, ¹⁸⁵Bi(p), ^103,104,105Sb, ¹⁰⁸I, ¹¹¹Cs, ^116,117La, ¹²⁷Pm, ¹²⁹Pm, ¹³⁷Tb, ^{161,163,165,167,169,171}Ir, ¹⁶⁹Au, ¹⁷¹Au, ¹⁸⁵Bi, ²¹¹Pa, ^{195,196,197,198,199,200,201,202,203,204,205,206,207}Ac, ^198,199Th, ^{200,201,202,203,204,205,206,207,208,209}Pa, ^212,213Pa, ²⁰³U, ^{206,207,208,209,210,211,212,213,214,215,216,217}Np, ²⁰⁹Pu, ^{212,213,214,215,216,217,218,219,220,221,222,223,224}Am, ²¹⁵Cm, ^{218,219,220,221,222,223,224,225,226,227}Bk, ²²¹Cf, ^{224,225,226,227,228,229,230,231}Es, ^{229,230,231,232,233,234,235,236,237,238,239}Md, ^232,233No, ^{235,236,237,238,239,240,241,242,243}Lr(p); analyzed available data; calculated T_1/2; deduced parameters.

doi: 10.5506/aphyspolb.51.2125
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2020YA18      Chin.J.Phys.(Taiwan) 66, 406 (2020)

A.Yarahmadi, S.A.Alavi, V.Dehghani

β⁺/EC transitions of ⁴⁰Sc using Tamm-Dancoff approximation

RADIOACTIVITY ⁴⁰Sc(β⁺), (EC); calculated wave functions of nuclear excited states, excited states energies, partial decay half-lives, total decay half-life, log ft. Comparison with experimental data.

doi: 10.1016/j.cjph.2020.04.023
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2019BE28      Eur.Phys.J. A 55, 105 (2019)

Kh.Benam, V.Dehghani, S.A.Alavi

Role of magic numbers in thermodynamic quantities of ²⁰⁶Pb and ¹³⁸Ba using BCS and Lipkin-Nogami models

doi: 10.1140/epja/i2019-12785-3
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2019MA13      Nucl.Phys. A983, 77 (2019)

N.Maroufi, V.Dehghani, S.A.Alavi

Alpha and cluster decay of some deformed heavy and superheavy nuclei

RADIOACTIVITY ^256,258,263Rf, ^{256,257,258,259,263}Rf, ^{260,261,262,269,271}Sg, ^{260,261,164,266,267,270,272,274}Bh, ^{264,265,266,267,270,273}Hs, ^{268,274,275,276}Mt, ^{267,269,270,271,273,277}Ds, ^{272,274,278,279,280}Rg, ^281,285Cn, ^{278,282,283,284,285,286}Nh, ^{286,287,288,289}Fl, ^287,288Mc, ^{290,291,292,293}Lv, ^293,294Ts, ²⁹⁴Og (α); calculated Qα, T_1/2; half lives compared with data. ²³¹Pa (²³F), ²³⁰U (²²Ne), ²³⁰Th, ²³¹Pa, ^{230,232,233,234,235,236}U (²⁴Ne), ²³²Th, ^234,236U (²⁶Ne), ^232,233,234U, ^236,238Pu (²⁸Mg), ²³⁶U, ²³⁷Np, ²³⁸Pu (³⁰Mg), ²³⁸Pu (³²Si); calculated Q, cluster preformation probability, T_1/2; half lives compared to data. Calculated, predicted about 70 other cluster decays with T_1/2 compared with other predictions (no data).

doi: 10.1016/j.nuclphysa.2018.12.023
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2019NA30      Int.J.Mod.Phys. E28, 1950077 (2019)

D.Naderi, S.A.Alavi, V.Dehghani

Mass-split dependence of pre-scission neutron multiplicity by four-dimensional Langevin dynamics in ^{16, 18}O, ⁴⁰Ar and ⁶⁴Ni-induced fusion-fission reactions

NUCLEAR REACTIONS ¹⁴⁴Sm(¹⁸O, X), ¹⁹⁷Au(¹⁶O, X), ¹⁰⁹Ag(¹⁶O, X), ²³⁸U(⁴⁰Ar, X), E not given; analyzed available data; calculated fission dynamics using multidimensional Langevin model, including elongation, neck thickness, asymmetry parameter and orientation degree of freedom.

doi: 10.1142/s0218301319500770
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2019SA34      Z.Naturforsch. 74, 551 (2019)

M.Sayahi, V.Dehghani, D.Naderi, S.A.Alavi

Prediction of Alpha Decay Half-Lives of Z = 118-121 Superheavy Nuclei with A ≤ 300 by Using the Double-Folding Potential

NUCLEAR STRUCTURE Z=118-121; calculated α-decay T_1/2 using the density-dependent nuclear potential in the framework of the WKB method.

doi: 10.1515/zna-2019-0008
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2018AL28      Nucl.Phys. A977, 49 (2018)

S.A.Alavi, V.Dehghani, M.Sayahi

Calculation of proton radioactivity half-lives

RADIOACTIVITY ¹⁰⁵Sb, ¹⁰⁹I, ^112,113Cs, ¹¹⁷La, ¹²¹Pr, ^130,131Eu, ¹³⁵Tb, ^140,141Ho, ^{144,145,146,147}Tm, ^150,151Lu, ^155,156,157Ta, ^159,160,161Re, ^164,166,167Ir, ^170,171Au, ^176,177Tl, ^141mHo, ^146m,147mTm, ^150m,151mLu, ^156mTa, ^159m,161mRe, ^{165m,166m,167m}Ir, ^177mTl, ^185mBi(p); calculated T_1/2 using WKB with Bohr-Sommerfeld quantization condition. Compared with data.

doi: 10.1016/j.nuclphysa.2018.06.001
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2018DE34      Chin.Phys.C 42, 104101 (2018)

V.Dehghani, S.A.Alavi

Empirical formulas for proton decay half-lives: Role of nuclear deformation and Q-value

RADIOACTIVITY ¹⁰⁹I, ^112,113Cs, ¹¹⁷La, ¹²¹Pr, ^130,131Eu, ¹³⁵Tb, ^140,141Ho, ^{144,145,146,147}Tm, ^150,151Lu, ^155,156,157Ta, ^159,160,161Re, ^164,166,167Ir, ¹⁷⁰Au, ^176,177Tl, ¹⁴¹Ho, ^146,147Tm, ^150,151Lu, ¹⁵⁶Ta, ^159,161Re, ^165,166,167Ir, ^170,171Au, ¹⁸⁵Bi(p); calculated Q-values, T_1/2. Comparison with experimental data.

doi: 10.1088/1674-1137/42/10/104101
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2017AL20      Phys.Rev. C 95, 054602 (2017)

S.A.Alavi, V.Dehghani

Investigation of heavy-ion fusion with deformed surface diffuseness: Actinide and lanthanide targets

NUCLEAR REACTIONS ¹⁴⁷Sm(¹⁶O, X), E(cm)=55-68 MeV; ¹⁵⁰Nd(¹⁶O, X), E(cm)=55-73 MeV; ¹⁵⁴Sm(¹⁶O, X), E(cm)=50-100 MeV; ¹⁶⁶Er(¹⁶O, X), E(cm)=60-95 MeV; ²³²Th(¹⁶O, X), E(cm)=72-95 MeV; ²³⁸U(¹⁶O, X), E(cm)=85-160 MeV; ²³⁷Np(¹⁶O, X), E(cm)=72-94 MeV; ²⁴⁸Cm(¹⁶O, X), E(cm)=102-140 MeV; calculated nuclear and effective interaction potentials, fusion barrier heights and barrier positions, fusion σ as function of orientation angle, σ(E) and Δσ(E) for deformed and constant surface diffuseness. Deformed Broglia-Winther nuclear interaction potential in the framework of WKB method. Comparison with experimental data.

doi: 10.1103/PhysRevC.95.054602
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2017AL22      Chin.Phys.C 41, 064104 (2017)

S.A.Alavi, V.Dehghani

Alpha-induced reaction cross-section for Sm, U, Np targets: influence of hexadecapole deformation and deformed surface diffuseness

NUCLEAR REACTIONS ¹⁵⁴Sm, ^{233,235,236,238}U, ²³⁷Np(α, X), E(Cm)<30 MeV/nucleon; calculated fusion σ with quadrupole and hexadecapole deformation and deformed surface diffuseness. Comparison with experimental data.

doi: 10.1088/1674-1137/41/6/064104
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2017DA09      Nucl.Phys. A963, 68 (2017)

S.Dahmardeh, S.A.Alavi, V.Dehghani

Influence of deformed surface diffuseness on alpha decay half-lives of actinides and lanthanides

NUCLEAR REACTIONS ¹⁵⁶Lu, ²³²Th(α, x), E not given; calculated α-particle transmission coefficient for constant and deformed surface diffuseness.

RADIOACTIVITY ^151,154Dy, ^151,152Ho, ¹⁵³Er, ^153,154Tm, ^154,155,156Yb, ^156,157Lu, ^157,158,159Hf, ^{157,158,159,160}Ta, ^{217,218,219,221,222,223,224,225,226,228,229,230,232,234,236,238}U, ^{226,227,229,230}Np, ^{230,231,232,234,236,238,239,240,242,244}Pu, ^232,233Am, ^{233,234,238,241,246,248}Cm, ^237,241Bk, ^{241,243,244,245,246,252}Cf, ^247,254,255Es, ^{243,246,247,248,249,253,255,256}Fm, ^245,251Md, ^251,252,256No, ^253,259Lr, ^255,258,261Rf(α); calculated T_1/2 using WKB and taking into account Bohr-Sommerfeld quantization condition with account for deformation and for α-particle emission angle. Compared with data.

doi: 10.1016/j.nuclphysa.2017.04.013
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2016AL20      Int.J.Mod.Phys. E25, 1650065 (2016)

S.A.Alavi, V.Dehghani

Back shifted Fermi gas model with temperature dependent pairing energy: Thermal properties of ⁹⁸Mo

NUCLEAR STRUCTURE ⁹⁸Mo; calculated level density and heat capacity. Back-shifted Fermi-gas formula of nuclear level densities, comparison with experimental data.

doi: 10.1142/S0218301316500658
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2016DE37      Eur.Phys.J. A 52, 306 (2016)

V.Dehghani, S.A.Alavi

Nuclear level density of even-even nuclei with temperature-dependent pairing energy

NUCLEAR STRUCTURE ⁹⁶Mo, ^106,112Cd, ^106,108Pd, ¹⁶⁴Dy, ²³²Th, ²³⁸U; calculated level density. ⁹⁶Mo, ¹⁶⁴Dy calculated heat capacity. Temperature-dependent pairing term on BSFG (Back-Shifted Fermi Gas). Compared with data.

doi: 10.1140/epja/i2016-16306-8
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2013NA09      Phys.Rev. C 87, 054618 (2013)

D.Naderi, M.R.Pahlavani, S.A.Alavi

Anisotropy of the angular distribution of fission fragments in heavy-ion fusion-fission reactions: The influence of the level-density parameter and the neck thickness

NUCLEAR REACTIONS ²⁰⁸Pb(¹⁶O, X), E=85-150 MeV; ²⁰⁹Bi(²⁰Ne, X), E=120-220 MeV; calculated neutron multiplicity, and anisotropy of angular distribution of fission fragments as function of incident beam energy. Heavy ion fusion-fission reactions. Effects of the level-density parameter based on liquid drop model and neck thickness. One- and two-dimensional Langevin dynamical approach. Comparison with experimental data.

doi: 10.1103/PhysRevC.87.054618
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