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NSR database version of April 27, 2024.

Search: Author = A.Rahmatinejad

Found 14 matches.

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2024MU02      J.Radioanal.Nucl.Chem. 333, 1559 (2024)

R.S.Mukhin, A.V.Isaev, A.V.Andreev, M.L.Chelnokov, V.I.Chepigin, H.M.Devaraja, B.Gall, K.Hauschild, I.N.Izosimov, A.A.Kuznetsova, A.Lopez-Martens, O.N.Malyshev, A.G.Popeko, Yu.A.Popov, A.Rahmatinejad, B.Sailaubekov, T.M.Shneidman, E.A.Sokol, A.I.Svirikhin, M.S.Tezekbayeva, A.V.Yeremin

Analysis of the shape of multiplicity distributions of prompt neutrons emitted in spontaneous fission

RADIOACTIVITY ^{253,254,255,256,257,258,259,260,261,262}Rf, ^{252,253,254,255,256,257,258,259,260,261,262}Lr, ^{249,250,251,252,253,254,255,256,257,258,259,260,261}No, ^{245,246,247,248,249,250,251,252,253,254,255,256,257,258,259}Md, ^{243,244,245,246,247,248,249,250,251,252,253,254,255,256,257,258,259}Fm(SF); analyzed available data; deduced the prompt neutron multiplicity distribution (PNMD) emitted is the spontaneous fission (SF), shape of the PNMD helps to achieve the information according the dynamic of the SF.

doi: 10.1007/s10967-023-09164-0
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2023IS03      Phys.Lett. B 843, 138008 (2023)

A.V.Isaev, R.S.Mukhin, A.V.Andreev, Z.Asfari, M.L.Chelnokov, V.I.Chepigin, H.M.Devaraja, O.Dorvaux, B.Gall, K.Hauschild, I.N.Izosimov, A.A.Kuznetsova, A.Lopez-Martens, O.N.Malyshev, A.G.Popeko, Yu.A.Popov, A.Rahmatinejad, B.Sailaubekov, T.M.Shneidman, E.A.Sokol, A.I.Svirikhin, M.S.Tezekbayeva, A.V.Yeremin, N.I.Zamyatin

Structure of the prompt neutron multiplicity distribution in the spontaneous fission of ²⁵⁶Rf

RADIOACTIVITY ²⁵⁶Rf(SF), (α) [from ²⁰⁸Pb(⁵⁰Ti, X), E=237 MeV];measured fission products, En, In, TOF; deduced neutron multiplicity distribution, alpha decay branching ratio and T_1/2. Prompt neutron multiplicity study in the superheavy element region. SHELS separator, U-400 cyclotron, the Flerov laboratory at JINR.

doi: 10.1016/j.physletb.2023.138008
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Data from this article have been entered in the XUNDL database. For more information, click here.

2022DE36      Phys.Atomic Nuclei 85, 805 (2022)

M.Demichev, S.Abou El Azm, A.Bezbakh, M.Gostkin, N.Jovancevic, D.Knezevic, V.Kobets, M.Krmar, U.Kruchonak, S.Mitrofanov, A.Nozdrin, S.Porokhovoy, A.Rahmatinejad, T.Shneidman, V.Stegaylov, Y.Teterev, A.Zhemchugov

Study of ²⁰⁹Bi(γ, xn) Reactions in Energy Region up To 100 MeV

NUCLEAR REACTIONS ²⁰⁹Bi(γ, xn), E<100 MeV; measured reaction products, Eγ, Iγ. ^{200,201,202,203,204,205,206,207}Bi; deduced relative yields. Comparison with GEANT4 simulations. Electron accelerator LINAC-200, located at Laboratory of Nuclear Problems of JINR, Dubna.

doi: 10.1134/S1063778823010167
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2022IS05      Eur.Phys.J. A 58, 108 (2022)

A.V.Isaev, R.S.Mukhin, A.V.Andreev, M.A.Bychkov, M.L.Chelnokov, V.I.Chepigin, H.M.Devaraja, O.Dorvaux, M.Forge, B.Gall, K.Hauschild, I.N.Izosimov, K.Kessaci, A.A.Kuznetsova, A.Lopez-Martens, O.N.Malyshev, A.G.Popeko, Yu.A.Popov, A.Rahmatinejad, B.Sailaubekov, T.M.Shneidman, E.A.Sokol, A.I.Svirikhin, D.A.Testov, M.S.Tezekbayeva, A.V.Yeremin, N.I.Zamyatin, K.Sh.Zhumadilov

Prompt neutron emission in the spontaneous fission of ²⁴⁶Fm

RADIOACTIVITY ²⁴⁶Fm(SF) [from ²⁰⁸Pb(⁴⁰Ar, X), E=183 MeV]; measured decay products, En, In; deduced neutron yields, nubar, spontaneous fission branching ratio, T_1/2. Tikhonov method of statistical regularisation. FLNR JINR using the SHELS separator and the SFiNx detection system, the U-400 cyclotron.

doi: 10.1140/epja/s10050-022-00761-3
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset41751. Data from this article have been entered in the XUNDL database. For more information, click here.

2022RA06      Phys.Rev. C 105, 044328 (2022)

A.Rahmatinejad, T.M.Shneidman, G.G.Adamian, N.V.Antonenko, P.Jachimowicz, M.Kowal

Energy dependent ratios of level-density parameters in superheavy nuclei

NUCLEAR STRUCTURE ^{282,283,284,285,286,287,288,289,290,291,292,293,294,295}Mc, ^{283,284,285,286,287,288,289,290,291,292,293,294,295,296}Lv, ^{279,280,281,282,283,284,285,286,287,288,289,290,291}Nh, ^{291,292,293,294,295,296,297,298}Ts, ^{291,292,293,294,295,296,297,298,299}Og, ²⁹²Fl, ^{295,296,297,298,299,300}119, ^{295,296,297,298,299,300,301,302}120; calculated intrinsic nuclear level densities, energy-dependent level-density parameters, energy-dependent ratios of level-density parameters corresponding to the nuclei at the fission saddle point and to proton and α-particle emission residues at their ground state to those obtained for the daughter nuclei after neutron emission. Thermodynamic superfluid formalism using the single-particle energies obtained from the diagonalization of the deformed Woods-Saxon potential.

doi: 10.1103/PhysRevC.105.044328
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2022RA31      Phys.Part. and Nucl.Lett. 19, 470 (2022)

A.Rahmatinejad, T.M.Shneidman

Kinetic Energy Distribution in Multi-Step Neutron Emission from Superheavy Nuclei

NUCLEAR STRUCTURE ²⁹⁹Og, ³⁰²120; calculated probability of realization of x=2-8 neutron evaporation channels, average kinetic energies of intermediate neutrons evaporated using the superfluid formalism with the single-particle energies obtained from the Woods-Saxon potential diagonalization at the ground state.

doi: 10.1134/S1547477122050351
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2021NO07      Can.J.Phys. 99, 466 (2021)

O.Nouri, R.Razavi, A.Rahmatinejad, S.Mohammadi

Ratios of negative-to-positive parity level densities in Mo isotopes

NUCLEAR STRUCTURE ^94,96,98Mo; calculated ratios of negative-to-positive parity level densities using a microscopic formalism based on the Bardeen-Cooper-Schrieffer (BCS) model.

doi: 10.1139/cjp-2020-0369
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2021RA04      Phys.Rev. C 103, 034309 (2021)

A.Rahmatinejad, A.N.Bezbakh, T.M.Shneidman, G.Adamian, N.V.Antonenko, P.Jachimowicz, M.Kowal

Level-density parameters in superheavy nuclei

NUCLEAR STRUCTURE ²⁹⁶Lv; calculated potential energy contour in the (β₂₀, β₂₂) plane, proton and neutron single-particle spectra along the fission paths using the Woods-Saxon potential diagonalization. ²⁹²Fl, ²⁹⁶Lv, ³⁰⁰120; calculated energy dependencies of the ground-state and saddle-point level-density parameters. A=277-302; calculated mass number dependence of the asymptotic ground state and saddle-point level-density parameters. ^{282,283,284,285,286,287,288,289,290,291,292}Fl; calculated ratios of the level density parameters at the saddle point and ground state. ²³⁶U, ²⁴⁰Pu; calculated dependence of fission probability on excitation energy for the fissioning nuclei. ^{293,294,295,296,297}Ts, ^{295,296,297,298,299,300,301,302}120; calculated ratios of the level density parameter of the mother nucleus at the saddle point to that of the daughter nucleus after neutron separation at the ground state. ²⁷⁸Cn, ²⁹⁴Og, ^296,298120; calculated dependence of neutron emission probability on excitation energy. Level density parameter calculated by fitting the obtained results with the standard Fermi gas expression.

doi: 10.1103/PhysRevC.103.034309
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2020RA07      Phys.Rev. C 101, 054315 (2020)

A.Rahmatinejad, T.M.Shneidman, N.V.Antonenko, A.N.Bezbakh, G.G.Adamian, L.A.Malov

Collective enhancements in the level densities of Dy and Mo isotopes

NUCLEAR STRUCTURE ^94,96,98Mo, ^160,162,164Dy; calculated β₂ and β₄ deformation parameters, shell corrections, pairing energies, neutron-, and proton-pairing gaps in the ground states, intrinsic level densities, energy dependent level densities, critical temperatures and corresponding critical energies, spin cut-off parameters, number of collective levels, and collective enhancement factors using the superfluid model with single-particle energies from the quasiparticle-phonon model (QPM) and Woods-Saxon potential. Comparison with experimental densities.

doi: 10.1103/PhysRevC.101.054315
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2018RA10      Nucl.Phys. A976, 61 (2018)

R.Razavi, A.Rashed Mohassel, A.Rahmatinejad, A.Jabarpour

Systematic of critical temperature of nuclear pairing transition

NUCLEAR STRUCTURE A=2-253; calculated critical temperature of nuclear pairing transitions for 440 nuclei using microscopic model; compiled gs pairing energy gap; deduced pairing energy formula, parameters. Compared to data.

doi: 10.1016/j.nuclphysa.2018.05.001
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2016RA15      Int.J.Mod.Phys. E25, 1650030 (2016)

A.Rahmatinejad, T.Kakavand, R.Razavi

Breaking of Cooper pairs in ¹⁰⁸Pd

NUCLEAR STRUCTURE ¹⁰⁸Pd; calculated level density, entropy, spin cutoff parameter ratio within the canonical ensemble framework and the BCS model.

doi: 10.1142/S0218301316500300
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2016RA22      Int.J.Mod.Phys. E25, 1650050 (2016)

A.Rahmatinejad, R.Razavi, T.Kakavand

Studying temperature dependence of pairing gap parameter in a nucleus as a small superconducting system

NUCLEAR STRUCTURE ⁴⁵Ti; calculated temperature dependence of proton pairing gap parameter and heat capacity, excitation energy and entropy as a function of temperature. Bardeen-Cooper-Schrieffer (BCS) theory.

doi: 10.1142/S0218301316500506
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2015RA08      Nucl.Phys. A939, 46 (2015)

A.Rahmatinejad, R.Razavi, T.Kakavand

Thermal quantities of ⁴⁶Ti

NUCLEAR STRUCTURE ⁴⁶Ti; calculated neutron gap vs temperature, heat vs temperature, temperature vr E^*, entropy vs temperature using canonical and microcanonical ensembles.

doi: 10.1016/j.nuclphysa.2015.03.010
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2015RA13      Nucl.Phys. A941, 145 (2015)

A.Rahmatinejad, R.Razavi, T.Kakavand

Role of neutron and proton system in spin cut off parameter and entropy of ^{89, 90}Y

NUCLEAR STRUCTURE ^89,90Y; calculated level density, pairing energy, entropy vs temperature, spin cut-off vs temperature for neutron and proton system using BCS model. Compared with available data.

doi: 10.1016/j.nuclphysa.2015.06.013
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