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Search: Author = V.Avrigeanu

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2023AV03      Phys.Rev. C 107, 034613 (2023)

M.Avrigeanu, V.Avrigeanu

Consistent optical potential for incident and emitted low-energy α particles. III. Nonstatistical processes induced by neutrons on Zr, Nb, and Mo nuclei

NUCLEAR REACTIONS 93Nb, 92,94,95,96,97,98,100Mo(n, X), E<12 MeV; calculated total σ(E), s- and p-wave neutron strength functions, potential scattering radius. 92Zr(p, γ), E=2-5 MeV; 92Zr(p, n), E=3-7 MeV; 94Zr(p, n), E=2-7 MeV; 96Zr(p, n), E=2-10 MeV; 93Nb(p, n), 93Nb(p, γ), E=1-MeV; calculated σ(E). 90,91,92Zr(α, γ), E=9-12 MeV; calculated σ, γ-strength functions. 88Sr(3He, α), E=36 MeV; 90,96Zr(3He, α), E=39 MeV; calculated σ(θ). 96Zr(α, n), E=6-15 MeV; 100Mo(α, xn)102Ru/103Ru, E=7.5-15 MeV; calculated σ(E). 93Nb(n, γ), E=0.0003-1.2 MeV; 93Nb(n, 2n), E=8-24 MeV; 93Nb(n, xp)92Zr/93Zr, E=5-24 MeV; calculated σ(E). 92Mo(n, p), E=4-21 MeV; 92Mo(n, 2n), E=13-22MeV; 90,92,94,96Zr(n, α), E=6-22 MeV; 93Nb(n, α), E=4-22 MeV; 92,95,98,100Mo(α, n), E=5-21 MeV; calculated σ(E) for ground and isomeric state excitation. 90Zr, 93Nb, 92Mo(n, α), (n, nα), E=14.5-14.8 MeV; calculated σ(E). Statistical calculations with Hauser-Feshbach and preequilibrium emission models combined with direct reaction DWBA analysis using FRESCO code. Increase of the α emission beyond the compound nuclei+preequlibrium emission predictions was obtained through consideration of additional Giant Quadrupole Resonance-like decay of excited nuclei. Detailed comparison with experimental data, with TALYS-1.8 calculations and evaluated data library TENDL-2021.

doi: 10.1103/PhysRevC.107.034613
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2022AV01      Eur.Phys.J. A 58, 3 (2022)

M.Avrigeanu, D.Rochman, A.J.Koning, U.Fischer, D.Leichtle, C.Costache, V.Avrigeanu

Advanced breakup-nucleon enhancement of deuteron-induced reaction cross sections

NUCLEAR REACTIONS 58Ni, 96Zr, 231Pa(d, X), (d, 2n), (d, 2p), E<200 MeV; calculated σ using TALYS-1.95 nuclear model code. Comparison with available data.

doi: 10.1140/epja/s10050-021-00659-6
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2022AV02      Phys.Rev. C 106, 024615 (2022)

V.Avrigeanu, M.Avrigeanu

Charged-particle optical potentials tested by first direct measurement of the 59Cu(p, α)56Ni reaction

NUCLEAR REACTIONS 59Cu(p, α), E<6.6 MeV; calculated σ(E). Comparison to the evaluated TENDL data and recent experimental results. Hauser-Feshbach based statistical model TALYS-1.95 calculations. Reached agreement with experimental data by consideration of proton optical–model potential (OMP) anomalies at sub-Coulomb energies for medium–weight nuclei.

doi: 10.1103/PhysRevC.106.024615
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2022AV03      Eur.Phys.J. A 58, 189 (2022)

V.Avrigeanu, M.Avrigeanu

Validation of an optical potential for incident and emitted low-energy α-particles in the A ≈ 60 mass range

NUCLEAR REACTIONS 58,60,61,62,64Ni, 59Co(n, X), (n, p), (n, 2n), (n, α), E<60 MeV; analyzed available data; deduced optical model parameters.

doi: 10.1140/epja/s10050-022-00831-6
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2021AV01      Eur.Phys.J. A 57, 54 (2021)

V.Avrigeanu, M.Avrigeanu

Validation of an optical potential for incident and emitted low-energy α-particles in the A ∼ 60 mass range

NUCLEAR STRUCTURE 50,51,52,53,54,55,56Cr, 52,53,54,55,56,57,58Mn, 52,53,54,55,56,57,58,59,60,61Fe, 55,56,57,58,59,60,61,62,63Co, 58,59,60,61,62,63,64,65,66Ni, 61,62,63,64,65,66,67Cu, 62,63,64,65,66,67,68Zn; analyzed available data; deduced nuclear level densities, consistent set of statistical-model input parameters.

doi: 10.1140/epja/s10050-020-00336-0
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2021SI31      Phys.Rev. C 104, 044615 (2021)

E.Simeckova, M.Avrigeanu, J.Mrazek, J.Novak, M.Stefanik, C.Costache, V.Avrigeanu

Deuteron-induced reactions on natZr up to 60 MeV

NUCLEAR REACTIONS Zr(d, xn), (d, p), (d, xnp), (d, xn2p), 90Nb/91mNb/92mNb/94mNb/95Nb/95mNb/96Nb/97Nb/89Zr/89mZr/95Zr/97Zr/87Y/87mY/88Y/90mY/91mY/94Y, E=4.32-19.80 MeV from U-120M cyclotron of CANAM-NPI-CAS; measured Eγ, Iγ, activation σ(E) by stacked-foil technique and off-line γ-ray spectroscopy using two HPGe detectors, natural Zr target. 90Zr(d, d), E=5.5, 9, 10, 11, 12, 13, 15, 23.2, 28.8, 56 MeV; 90,91,92,94,96Zr(d, d), E=34.4 MeV; analyzed available experimental σ(θ, E) data using global optical model potential (OMP), and used to analyze literature particle-transfer σ(θ) data for excited states in residual nuclei. 90Zr(d, p), E=15.89 MeV; 91,92Zr(d, p), E=12 MeV; 92,96Zr(d, p), E=33.3 MeV; 94Zr(d, p), E not given; 90Zr(d, n), E=12 MeV; 90Zr(d, α), E=17 MeV; 94,96Zr(d, α), E=11.5, 28 MeV; 90Zr(d, t), E=21.14 MeV; 91,92,94,96Zr(d, t), E=11.8 MeV; 91Zr(3He, d), E=17 MeV; Zr(d, xn)91,95Nb, 94Zr(d, n), 96Zr(d, 3n), E=10-60 MeV; Zr(d, xnp)88Zr, E=20-60 MeV; Zr(d, x)86Y/87Y/87mY/88Y/90mY, E=5-60 MeV; 94Zr(d, xnp)88Zr, E=20-60 MeV; 94Zr(d, xn2p)86Y, E=20-60 MeV; analyzed literature experimental σ(θ) and σ(E) data using pre-equilibrium emission (PE) and compound nucleus (CN) decay statistical emission mechanisms, with the inclusion of deuteron breakup (BU). Comparison of activation cross section data with TENDL-2019 evaluation and model calculations. For particle transfer reactions data taken from literature, level energies, J, π and spectroscopic factors are given in the Supplemental Material.

doi: 10.1103/PhysRevC.104.044615
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0996.


2020AV01      Phys.Rev. C 101, 024605 (2020)

M.Avrigeanu, E.Simeckova, U.Fischer, J.Mrazek, J.Novak, M.Stefanik, C.Costache, V.Avrigeanu

Deuteron-induced reactions on manganese at low energies

NUCLEAR REACTIONS 55Mn(d, p), (d, t), (d, 2nα), E=3.13-19.49 MeV; measured Eγ, Iγ, σ(E), by activation method at the variable-energy cyclotron U-120M facility of NPI-CAS, Rez. 55Mn(d, p), (d, t), (d, 2nt), (d, 2nα), E<50 MeV; analyzed present and previous data for σ(E). 55Mn(d, p)56Mn, E=7.5 MeV; 55Mn(d, t)54Mn, E=17, 18 MeV; analyzed previous differential σ(θ) data for 20 levels in 56Mn up to 4.54 MeV, and for 25 levels in 54Mn up to 3.42 MeV. Comparison with TALYS-1.9 theoretical calculations. Discussed deuteron breakup (BU) and direct reaction (DR) mechanisms.

doi: 10.1103/PhysRevC.101.024605
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0973.


2019AV01      Phys.Rev. C 99, 044613 (2019)

V.Avrigeanu, M.Avrigeanu

Role of consistent parameter sets in an assessment of the α-particle optical potential below the Coulomb barrier

NUCLEAR STRUCTURE 67Ga, 67,68Ge, 112Sn, 117,119Sb, 124,125,126,127I, 195,198Au; deduced BSFG level-density parameter, and average s-wave radiation widths Γγ corresponding to the SLO, GLO, and EGLO models from fitting of low-lying levels used in shell-model calculations. 61,62,63,64,65Cu, 64,66Zn, 69Ga, 76Ge; comparison of measured dipole γ-ray strength functions with the sum of calculated γ-ray strength functions using the SLO model for M1 radiations, and SLO, GLO and EGLO models for E1-radiation.

NUCLEAR REACTIONS 64Zn(α, p)67Ga, E=6-16 MeV; 64Zn(α, n)67Ge, E=10-16 MeV; 108Cd(α, γ)112Sn, 108Cd(α, n)111Sn, E=9.8-13.6 MeV; 113In(α, γ)117Sb, 113In(α, n)116Sb/116mSb, E=9.4-14.2 MeV; 115In(α, γ)119Sb, 115In(α, n)118Sb/118mSb, E=9.4-16.4 MeV; 121Sb(α, γ)125I, E=9.9-14.1 MeV; 121Sb(α, n)124I, E=10-16.6; 123Sb(α, n)126I, E=11.8-16.6 MeV; 191,193Ir(α, n)194Au/196Au, E=13.6-17 MeV; 197Au(n, γ)198Au, E=0.005-8 MeV; calculated σ(E) for α-induced reactions using the electric-dipole RSF models SLO, GLO, EGLO models along with the SLO model for M1 radiation, as well as EGLO and the M1-radiation upbend with the proton Optical model potential (OMP), and compared with the measured values, and with the data in evaluated TENDL-2017 library; deduced uncertainties and/or systematic errors of an α-particle OMP, and that α-particle optical potential is valid at incident energies below the Coulomb barrier using statistical-model parameters.

doi: 10.1103/PhysRevC.99.044613
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2019KR03      Phys.Rev. C 99, 034611 (2019)

A.Kreisel, L.Weissman, A.Cohen, T.Hirsh, A.Shor, O.Aviv, I.Eliyahu, M.Avrigeanu, V.Avrigeanu

Measurements of 59Co(d, p)60m, gCo, 51V(d, p)52V and natV(d, xn)51Cr cross sections in the 2.7-5.4- MeV energy range

NUCLEAR REACTIONS 59Co(d, p)60Co/60mCo, E=3.4, 3.8, 4.3, 4.8, 5.4 MeV; 51V(d, p), E=2.7, 3.0, 3.4, 3.8, 4.3, 4.8, 5.4 MeV; 50V(d, n), (d, 2n), E=3.0, 3.4, 3.8, 4.3, 4.8, 5.4 MeV; measured Eγ, Iγ, and σ(E) by activation method at Soreq Applied Research Accelerator Facility (SARAF); deduced total breakup, direct stripping, and total direct interaction excitation functions. 50V(d, d), (d, p), E=7.5 MeV; 59Co(d, d), (d, p), E=6.5 MeV; 51V(d, p), E=1.5-7 MeV; V(d, xn), E=2.7-7.5 MeV; 59Co(d, p), E=2-17 MeV; 59Co(d, 2p), E=2-17 MeV; analyzed previous and present σ(E) σ(E, θ) data using the structure data from the ENSDF database, and theoretical calculations using the optical model, and processes of pre-equilibrium emission (PE) and evaporation from the compound nucleus (CN) using the STAPRE-H code.

doi: 10.1103/PhysRevC.99.034611
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0954.


2018SI23      Phys.Rev. C 98, 034606 (2018)

E.Simeckova, M.Avrigeanu, U.Fischer, J.Mrazek, J.Novak, M.Stefanik, C.Costache, V.Avrigeanu

Consistent account of deuteron-induced reactions on natCr up to 60 MeV

NUCLEAR REACTIONS Cr(d, xn)54Mn/52Mn/52mMn/51Mn, E=4-20 MeV; Cr(d, X)51Cr/48V, E=4-20 MeV; measured Eγ, Iγ from radioactive reaction product, σ(E) by activation method using the variable-energy cyclotron U-120M at CANAM-NPI-CAS at Rez, Czech Republic. 50,52,53,54Cr(d, d), (d, xn), (d, X), E=3-60 MeV; 50Cr(d, p)51Cr, E=12 MeV; 52Cr(d, p)53Cr, E=7.5 MeV; 52Cr(d, α)50V, E=17 MeV; 53Cr(d, t)52Cr, E=11.8 MeV; 54Cr(d, p)55Cr, E=10 MeV; 54Cr(d, t)53Cr, E=11.8, 12 MeV; analyzed data from literature for elastic scattering differential σ(θ, E), and total reaction σ(θ, E) for direct reaction (DR), and break-up (BU) reaction channels. Comparison with theoretical predictions, and TENDL-2017 evaluations.

doi: 10.1103/PhysRevC.98.034606
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0915.


2017AV01      Phys.Rev. C 95, 024607 (2017)

M.Avrigeanu, V.Avrigeanu

Additive empirical parametrization and microscopic study of deuteron breakup

NUCLEAR REACTIONS 12C, 27Al, 54,56,57,58Fe, 58,60,61,62,64Ni, 63,65Cu, 90Zr, 93Nb, 119Sn, 209Bi, 238U(d, X), E<80 MeV; analyzed and compared experimental deuteron breakup (BU) process with the results of microscopic description for targets from 12C to 209Bi at E(d) of 56 MeV; deduced mass dependencies of the elastic breakup (EB) cross sections.

doi: 10.1103/PhysRevC.95.024607
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2017AV04      Phys.Rev. C 96, 044610 (2017)

V.Avrigeanu, M.Avrigeanu

Consistent optical potential for incident and emitted low-energy α particles. II. α emission in fast-neutron-induced reactions on Zr isotopes

NUCLEAR REACTIONS 88Sr, 89Y(p, n), E=3-11 MeV; calculated σ(E) and compared with experimental values. 88Sr, 89Y(p, γ), E=1-6 MeV; 70,74Ge, 90,91,92Zr(α, γ), E=6-12 MeV; 89Y, 90,91,92,94,96Zr(n, γ), E=0.001-3 MeV; 90,91,92,94,96Zr(n, p), (n, d), E=5-22 MeV; 90,96Zr(n, 2n), E=5-22 MeV; 90,92,94,96Zr(n, α), E=7-22 MeV; 91Zr(n, nα), E=15-22 MeV; calculated σ(E) and γ-strength functions of E1 and M1 radiations for (p, γ) and (α, γ) reactions using several models: former Lorentzian (SLO), generalized Lorentzian (GLO), enhanced generalized Lorentzian (EGLO), EGLO+SR (small resonance). Statistical model (SM) Hauser-Feshbach (HF) and pre-equilibrium emission (PE) geometry dependent hybrid (GDH) model calculations using STAPRE-H95 code, and the optical-model (OM) code SCAT2. Direct interaction (DI) distorted-wave Born approximation (DWBA) method using DWUCK4 code for the calculation of collective inelastic scattering cross sections. Detailed comparison with experimental data, and also with calculations using TALYS-1.8 code, and evaluated data library TENDL-2015.

doi: 10.1103/PhysRevC.96.044610
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2016AV03      Phys.Rev. C 94, 014606 (2016)

M.Avrigeanu, E.Simeckova, U.Fischer, J.Mrazek, J.Novak, M.Stefanik, C.Costache, V.Avrigeanu

Deuteron-induced reactions on Ni isotopes up to 60 MeV

NUCLEAR REACTIONS Ni(d, X)55Co/56Co/57Co/58Co/58mCo/60Co/57Ni/65Ni/60Cu/61Cu/64Cu, E=1.5-19.59 MeV; measured Eγ, Iγ, σ(E) using stacked-foil technique and γ-activation method at U-120M cyclotron of CANAM, NPI CAS. Optical model analysis. Deuteron breakup and direct reactions. Comparison with previous experimental data. 58,64Ni(d, d), E=12-56 MeV; 60Ni(d, d), E=4.86-56 MeV; 61Ni(d, d), E=12.3 MeV; 62Ni(d, d), E=12, 22 MeV; 58Ni(d, p)59Ni, E=10 MeV; 58Ni(d, n)59Cu, E=7 MeV; 58Ni(d, t)57Ni, E=24 MeV; 58Ni(d, α)56Co, E=17 MeV; 58Ni(d, n)59Cu, E=10 MeV; 60Ni(d, p)61Ni, E=7.5 MeV; 61Ni(d, p)62Ni, E=12.3 MeV; 62Ni(d, p)63Ni, E=7.5 MeV; 64Ni(d, p)65Ni, E=7.5 MeV; analyzed σ(θ, E) data. 58,60,61,62,64Ni(d, X), 60Ni(d, n)61Cu, 60Ni(d, 2n)60Cu, 61Ni(d, 2n)61Cu, 61Ni(d, 3n)60Cu, Ni(d, X)61Cu, 62Ni(d, 3n)61Cu, Ni(d, X)60Cu, 60Ni(d, 4n)60Cu, 64Ni(d, 5n)61Cu, Ni(d, X)64Cu, 64Ni(d, 2n)64Cu, Ni(d, X)57Ni, 58Ni(d, t)57Ni, Ni, 58Ni(d, X)56Ni, Ni, 62,64Ni(d, X)61Co, 61Ni(d, 2p)61Co, Ni, 61,62Ni(d, X)60Co, 60Ni(d, 2p)60Co, Ni, 60,61,62,64Ni(d, X)58Co/58mCo, 58Ni(d, 2p)58Co/58mCo, Ni, 58,60,61Ni(d, X)57Co, Ni, 58,60Ni(d, X)56Co, Ni, 58,60Ni(d, X)55Co, Ni, 58,60,61Ni(d, X)56Mn, Ni, 58,60,61Ni(d, X)54Mn, Ni, 58,60,61Ni(d, X)51Cr, 58Ni(d, X)51Mn, Ni, 58,60,61Ni(d, X)52Mn, E=5-65 MeV; Ni(d, X)65Ni, 64Ni(d, p), E=2-30 MeV; analyzed activation σ(E) data by consideration of the pre-equilibrium (PE) and compound nucleus (CN) contributions corrected for decrease of the total-reaction cross section from the leakage of the initial deuteron flux due to the deuteron breakup (BU) and direct reaction (DR) processes. Comparison with TENDL-2015 evaluation, and model calculations.

doi: 10.1103/PhysRevC.94.014606
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0818.


2016AV04      Phys.Rev. C 94, 024621 (2016)

V.Avrigeanu, M.Avrigeanu

Analysis of uncertainties in α-particle optical-potential assessment below the Coulomb barrier

NUCLEAR REACTIONS 63,65Cu(p, n), E=1-8 MeV; 63,65Cu(p, n), E=1-4.5 MeV; calculated reaction σ(E) using proton OMP parameters, and compared with measured values. 61,62,63,64,65Cu, 64,66,68Zn, 69Ga, 76Ge, 105,106,111,112Cd, 116,117,118,119,121,122Sn; calculated E1 and M1 γ-ray strength functions using SLO, GLO, and EGLO models for E1, and SLO model for M1, compared with experimental data from (α, X) reactions. 58Ni(α, p), (α, n), (α, γ), E=4-11.5 MeV; 62Ni(α, p), (α, n), (α, γ), E=4.5-9 MeV; 64Ni(α, n), (α, γ), E=4-9 MeV; 60,61Ni(α, γ), E=5-7.5 MeV; 107Ag(α, n), (α, γ), E=8-13 MeV; 106Ag(α, p), (α, n), (α, γ), E=7.5-13 MeV; 112Sn(α, p), (α, γ), E=7.5-12.5 MeV; 164,166Er, 187Re(α, n), E=13-17 MeV; analyzed σ(E) data using the α-particle global OMPs. Relevance to statistical model calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.94.024621
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2015AV03      Phys.Rev. C 91, 064611 (2015)

V.Avrigeanu, M.Avrigeanu

Consistent optical potential for incident and emitted low-energy α particles

NUCLEAR REACTIONS 64Zn(α, p), (α, n), (α, γ), E=6-13.5 MeV; 64,68,70Zn(p, α), E=3-22 MeV; calculated σ(E) using the α-particle global OMPs. Ga(n, X), E=0.1-20 MeV; 70Ge(n, X), E=0.1-5 MeV; calculated total σ(E) using local 69Ga or global OMP parameter sets of Koning and Delaroche, and energy-dependent geometry parameters. 66,67,68,70Zn(p, n), E=2-11 MeV; calculated σ(E) using global OMP or finally adopted parameters. 61,62,63,64,65Cu, 64,66Zn, 65,69Ga, 68Ge(γ, γ'), E<12 MeV; calculated B(E1), B(M1) γ-ray strength functions using former Lorentzian (SLO), generalized Lorentzian (GLO) and enhanced generalized Lorentzian (EGLO) models for E1, and SLO model for M1 radiation. 64,66,68Zn(p, γ), E=1-8 MeV; calculated σ(E) using the proton OMPs and EGLO-model radiative strength functions (RSFs). Pre-equilibrium emission (PE) and compound-nucleus (CN) model calculations using a consistent set of nucleon and γ-ray transmission coefficients, and back-shifted Fermi gas (BSFG) nuclear level densities. Comparison with experimental data, and with predictions of TALYS calculations.

doi: 10.1103/PhysRevC.91.064611
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2015AV04      Phys.Rev. C 92, 021601 (2015)

M.Avrigeanu, V.Avrigeanu

Role of breakup and direct processes in deuteron-induced reactions at low energies

NUCLEAR REACTIONS 27Al, 56Fe, 63,65Cu, 89Y(d, X), E=4-8 MeV; analyzed compound-nucleus (CN) fractions of reaction σ(E) from measured neutron angular distributions, and unitary and consistent breakup (BU) and direct reactions (DR). Statistical model of nuclear reactions. Comparison with available data for 27Al, 54,56,57,58Fe, 63,65Cu, 93Nb, natural Fe and Cu, targets.

doi: 10.1103/PhysRevC.92.021601
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2014AV01      Phys.Rev. C 89, 044613 (2014)

M.Avrigeanu, V.Avrigeanu, P.Bem, U.Fischer, M.Honusek, K.Katovsky, C.Manailescu, J.Mrazek, E.Simeckova, L.Zavorka

Low energy deuteron-induced reactions on Fe isotopes

NUCLEAR REACTIONS 54Fe(d, n)55Co, 54Fe(d, α)52Mn/52mMn, 58Fe(d, p)59Fe, Fe(d, X)51Cr/54Mn/56Mn/56Co/57Co/58Co, E=4.11-19.74 MeV; measured reaction σ(E); comparison with theoretical calculations by FRESCO and TALYS-1.4 optical model codes, with TENDL-2013 library, and with previous experimental results. 54,56,58Fe(d, d), E=5-60 MeV; comparison of previously measured elastic σ(E) with theoretical calculations using various optical potentials. 27Al, 54,56,57Fe, 58,62Ni, 90Zr, 93Nb, 119Sn, 181Ta, 208Pb, 232Th(d, X), E=5-60 MeV; comparison of previously measured total reaction σ(E) and the total proton-emission breakup σ(E) with theory. 54Fe(d, p), E=14 MeV; comparison of previously measured and theoretical σ(θ) distributions for 14 levels in 55Fe. 54,56,58Fe(d, p), 54,56,57Fe(d, n), 56,57,58Fe(d, 2n), (d, 3n), 57,58Fe(d, 4n), 58Fe(d, 5n), 54Fe(d, α), 54,56,57,58Fe, Fe(d, X), (d, xn)51Cr/52Mn/52mMn/54Mn/56Mn/55Co/56Co/57Co/58Co/58mCo/53Fe/55Fe/59Fe, E=5-60 MeV; calculated total reaction, breakup and transfer σ(E). Comparison of theoretical calculations with present and previous measurements, and with TENDL-2013 library.

doi: 10.1103/PhysRevC.89.044613
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0672.


2014AV02      Nucl.Data Sheets 118, 262 (2014)

V.Avrigeanu, M.Avrigeanu

Consistent Treatment of (α, x) Reaction Cross Sections and α-particle Emission Particularly in Fast-neutron Induced Reactions

NUCLEAR REACTIONS 91Zr(α, γ), E=9.2-11.6 MeV;92Mo(n, α), E=5-20 MeV;95Mo(n, α), E=0.001-2 MeV;120Te(α, n), 127I(α, n), (α, γ), E=9.5-16 MeV;130Ba(α, γ), E=12-17 MeV;132Ba(α, n), E=12-17 MeV;141Pr(α, n), E=11-15.5 MeV;144Sm(α, γ), E=10.3-15.5 MeV;169Tm(α, γ), E=12-18 MeV;169Tm(α, n), E=11-20 MeV; calculated σ using optical model; deduced optical model parameters, influence of parameters on σ. Compared with available data.

doi: 10.1016/j.nds.2014.04.053
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2014AV03      Nucl.Data Sheets 118, 301 (2014)

M.Avrigeanu, V.Avrigeanu

Consistent Analysis of the Nuclear Reaction Mechanisms Involved in Deuteron-induced Activation at Low and Medium Energies

NUCLEAR REACTIONS 54,56,57Fe, Fe(d, x), (d, xn), (d, p), E=threshold-60 MeV;54Fe(d, t), E=threshold-30 MeV; calculated total σ. Compared with available data and TENDL. 54,56,57,58Fe(d, x), E=threshold-60 MeV; calculated total σ, breakup, stripping, pick-up σ. 54Fe(d, p), E=14 MeV; calculated σ(θ) to discrete states; compared to data. TALYS-1.4 code.

doi: 10.1016/j.nds.2014.04.064
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2014AV06      Phys.Rev. C 90, 044612 (2014)

V.Avrigeanu, M.Avrigeanu, C.Manailescu

Further explorations of the α-particle optical model potential at low energies for the mass range A ≈ 45-209

NUCLEAR REACTIONS 148,149Sm, 156,157,158Gd, 160,161,162,163,164Dy, 166,167Er, 170,171,172Yb(α, γ), E below Coulomb barrier; calculated electric-dipole γ-ray strength function using the former Lorentzian (SLO), generalized Lorentzian (GLO) and enhanced generalized Lorentzian (EGLO) models. 113In, 120Te, 127I, 130Ba, 141Pr, 151Eu, 165Ho, 162,166Er, 169Tm, 168Yb(α, n), E=10-16 MeV; 113In, 127I, 130Ba, 144Sm, 162Er, 169Tm, 168Yb(α, γ), E=9-17 MeV; 174,176,177,178,179,180Hf, Hf(n, X), E=0.001-1 MeV; 45Sc, 58Ni, 112Sn, 141Pr, 169Tm, 197Au(α, X), E<50 MeV; calculated reaction σ(E). 50Ti, 51V, 50,52,53Cr, 56,58Fe, 59Co, 58,60,62,64Ni, 63Cu, 70,72,74,76Ge, 76,78,80Se, 89Y, 90,91,92Zr, 94Mo, 107Ag, 112,116,122,124Sn, 132,134,136,138Ba, 140Ce, 144Sm, 182,184,186W, 192Os, 197Au, 208Pb, 209Bi(α, α), E=15-28 MeV; calculated σ(θ, E); deduced α-particle optical model parameters for A=45-209 target nuclei. Comparison with experimental data.

doi: 10.1103/PhysRevC.90.044612
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2014FI12      Nucl.Data Sheets 120, 226 (2014)

U.Fischer, M.Avrigeanu, V.Avrigeanu, O.Cabellos, I.Kodeli, A.Koning, A.Yu.Konobeyev, H.Leeb, D.Rochman, P.Pereslavtsev, P.Sauvan, J.-C.Sublet, A.Trkov, E.Dupont, D.Leichtle, J.Izquierdo

The Activities of the European Consortium on Nuclear Data Development and Analysis for Fusion

doi: 10.1016/j.nds.2014.07.053
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2014LE24      Nucl.Data Sheets 119, 353 (2014)

X.Ledoux, M.Aiche, M.Avrigeanu, V.Avrigeanu, L.Audouin, E.Balanzat, B.Ban-detat, G.Ban, G.Barreau, E.Bauge, G.Belier, P.Bem, V.Blideanu, C.Borcea, S.Bouffard, T.Caillaud, A.Chatillon, S.Czajkowski, P.Dessagne, D.Dore, M.Fallot, F.Farget, U.Fischer, L.Giot, T.Granier, S.Guillous, F.Gunsing, C.Gustavsson, B.Jacquot, K.Jansson, B.Jurado, M.Kerveno, A.Klix, O.Landoas, F.R.Lecolley, J.L.Lecouey, M.Majerle, N.Marie, T.Materna, J.Mrazek, F.Negoita, J.Novak, S.Oberstedt, A.Oberstedt, S.Panebianco, L.Perrot, A.J.M.Plompen, S.Pomp, J.M.Ramillon, D.Ridikas, B.Rosse, G.Rudolf, O.Serot, S.P.Simakov, E.Simeckova, A.G.Smith, J.C.Sublet, J.Taieb, L.Tassan-Got, D.Tarrio, A.Takibayev, I.Thfoin, I.Tsekhanovich, C.Varignon

The Neutrons for Science Facility at SPIRAL-2

doi: 10.1016/j.nds.2014.08.097
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2013AV05      Phys.Rev. C 88, 014612 (2013)

M.Avrigeanu, V.Avrigeanu, P.Bem, U.Fischer, M.Honusek, A.J.Koning, J.Mrazek, E.Simeckova, M.Stefanik, L.Zavorka

Low-energy deuteron-induced reactions on 93Nb

NUCLEAR REACTIONS 93Nb(d, p)94mNb; 93Nb(d, 2n)93mMo; 93Nb(d, X)92mNb; 93Nb(d, 2nα)89Zr; 93Nb(d, pα)90mY, E=1-20 MeV; measured Eγ, Iγ, σ(E) by activation method and stacked-foil technique. Comparison with previous experimental data. 93Nb(d, d), E=11.8, 15, 34.4, 52 MeV; analyzed σ(θ, E) data; deduced optical model parameters. 93,94,95Mo; comparison of previously measured and calculated E1 strength functions. Comparisons with calculations which included deuteron breakup effects, one-nucleon transfer (DR), pre-equilibrium (PE) and compound nucleus mechanisms, spin distribution of nuclear level densities and radiative strength functions using FRESCO and STAPRE-H computer codes. Comparison with calculations using TALYS-1.4 computer code, and with TENDL-2012 evaluated data.

doi: 10.1103/PhysRevC.88.014612
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2012AV02      Phys.Rev. C 85, 034603 (2012)

M.Avrigeanu, V.Avrigeanu, A.J.Koning

Investigation of deuteron breakup and deuteron-induced fission on actinide nuclei at low incident energies

NUCLEAR REACTIONS 231Pa(d, 3n)230U, E=10-20 MeV; analyzed deuteron breakup cross section as function of energy, excitation function, neutron- and proton-emission cross sections. Investigated dominance of the deuteron breakup mechanism. Comparison with Evaluated data.

doi: 10.1103/PhysRevC.85.034603
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2012AV04      Phys.Rev. C 85, 044618 (2012)

M.Avrigeanu, V.Avrigeanu, M.Diakaki, R.Vlastou

Isomeric cross sections of fast-neutron-induced reactions on 197Au

NUCLEAR REACTIONS 197Au(n, xn)194Au/195Au/196Au/196mAu, E=8-40 MeV; 197Au(n, p)197Pt/197mPt, E=8-20 MeV; 197Au(n, α)194Ir/194mIr, E=8-20 MeV; analyzed σ(E); deduced model parameters. Optical potential model with level density from backshifted Fermi gas (BSFG) formula. Comparison with evaluated data libraries.

doi: 10.1103/PhysRevC.85.044618
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2011AV02      Phys.Rev. C 83, 017601 (2011)

V.Avrigeanu, M.Avrigeanu

Analysis of α-induced reactions on 151Eu below the Coulomb barrier017601

NUCLEAR REACTIONS 151Eu(α, γ), (α, n), E=12-17 MeV; calculated σ using optical model potential (OMP). Comparison with measured cross sections. 154Tb; deduced level, isomer, J, π.

doi: 10.1103/PhysRevC.83.017601
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2011AV07      J.Korean Phys.Soc. 59, 891s (2011)

V.Avrigeanu, M.Avrigeanu

Key Issues for Consistent Description of Neutron-induced Reactions on Cr Isotopes

NUCLEAR REACTIONS 50,52,53,54Cr(n, X), E=0.1-60 MeV;50,52,53,54Cr(n, γ), E=0.001-1 MeV;50,52Cr(n, n'), E=0-60 MeV;52Cr(n, p), E=5-22 MeV;52Cr(n, 2n), E=10-40 MeV;51V(p, n), E=0-25 MeV;51V(p, γ), E=1-5 MeV;51V, 55Mn, 59Co, 63,65Cu(p, X), E=0-50 MeV; calculated σ using TALYS and EMPIRE-II codes with different optical model parameters. Comparison with data.

doi: 10.3938/jkps.59.891
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2011AV08      J.Korean Phys.Soc. 59, 903s (2011)

M.Avrigeanu, V.Avrigeanu

Analysis of Deuteron Breakup and Induced Activation on Medium Nuclei

NUCLEAR REACTIONS 59Co(d, d), E=6.5, 17 MeV;93Nb(d, d), E=11.8, 15, 34.4, 52 MeV; calculated σ(θ); 59Co(d, d), E=0-60 MeV; calculated σ; 59Co, 63,65Cu, 93Nb(d, X), (d, p), E=0-30 MeV; calculated σ and separately elastic and inelastic breakup σ; 93Nb(n, 2n), E=0-30 MeV;93Nb(p, d), E=10-45 MeV;93Nb(p, n), E=3-60 MeV;93Nb(n, α), E=3-30 MeV;93Nb(n, nα), E=15-70 MeV;93Nb(d, x)92mNb, (d, 2n), E=5-45 MeV;93Nb(d, x)90mY, E=13-45 MeV;93Nb(d, x)89Zr, E=15-45 MeV; calculated σ; 59Co(d, xn), (d, xp), E=7.5 MeV; calculated σ(En), σ(Ep). TALYS 1.2 code with components from individual processes. Comparison with data and other calculations.

doi: 10.3938/jkps.59.903
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2011FI06      Phys.Rev. C 83, 064609 (2011)

D.Filipescu, V.Avrigeanu, T.Glodariu, C.Mihai, D.Bucurescu, M.Ivascu, I.Cata-Danil, L.Stroe, O.Sima, G.Cata-Danil, D.Deleanu, D.G.Ghita, N.Marginean, R.Marginean, A.Negret, S.Pascu, T.Sava, G.Suliman, N.V.Zamfir

Cross sections for α-particle induced reactions on 115, 116Sn around the Coulomb barrier

NUCLEAR REACTIONS 115Sn(α, γ)119Te, 115Sn(α, n)118Te, 116Sn(α, n)119Te, E(cm)=9.3-14.8 MeV; 48Ti(α, n)51Cr, E not given; measured Eγ, Iγ, cross sections. Comparison with previous data and predictions of statistical model calculations.

doi: 10.1103/PhysRevC.83.064609
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2011SI17      Phys.Rev. C 84, 014605 (2011)

E.Simeckova, P.Bem, M.Honusek, M.Stefanik, U.Fischer, S.P.Simakov, R.A.Forrest, A.J.Koning, J.-C.Sublet, M.Avrigeanu, F.L.Roman, V.Avrigeanu

Low and medium energy deuteron-induced reactions on 63, 65Cu nuclei

NUCLEAR REACTIONS Cu(d, X)64Cu, E=1.5-19.88 MeV; 63Cu(d, 2n)63Zn, E=4.56-19.49 MeV; 63Cu(d, 3n)62Zn, E=16.44-19.88 MeV; 65Cu(d, p)66Cu, E=4.56-19.49 MeV; 65Cu(d, 2n)65Zn, E=4.25-19.88 MeV; 65Cu(d, 2p)65Ni, E=11.36-19.88 MeV; measured Eγ, Iγ, σ(E), activation method. Comparison with previous experimental data, and with evaluated data files. Cu(d, d), E=11.8, 15, 21.6 MeV; 63,65Cu(d, d), E=12, 34.4 MeV; analyzed σ(θ) data; Cu(d, d), 63,65Cu(d, d), E<60 MeV; analyzed σ(E) data; deduced optical potential model parameters for reaction cross sections. Deuteron breakup mechanism, and direct reaction stripping discussed.

doi: 10.1103/PhysRevC.84.014605
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2011SI29      J.Korean Phys.Soc. 59, 1928s (2011)

E.Simeckova, P.Bem, M.Honusek, L.Zavorka, U.Fischer, S.P.Simakov, R.A.Forrest, M.Avrigeanu, V.Avrigeanu, F.L.Roman

On Low and Medium Energy Deuteron-Induced Reactions on 63, 65Cu

NUCLEAR REACTIONS 63,65Cu(d, p), (d, 2n), (d, 3n), (d, 2p), E=4-20 MeV; measured Eγ, Iγ using stacked-foil; deduced activation σ; calculated σ using optical model with CC code FRESCO and TALYS-1.0, STAPRE-H. Comparison with available data, TENDL-2009.

doi: 10.3938/jkps.59.1928
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2010AV02      Phys.Rev. C 81, 038801 (2010)

M.Avrigeanu, V.Avrigeanu

Additional α-particle optical potential tests below the Coulomb barrier

NUCLEAR REACTIONS 113In(α, n), (α, γ)116Sb/116mSb/117Sb, E=8-14 MeV; 115In(α, n), (α, γ)118Sb/118mSb/119Sb, E=8-25 MeV; calculated total α capture σ using optical model potential (OMP). Comparison with experimental data.

doi: 10.1103/PhysRevC.81.038801
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2010AV05      Phys.Rev. C 82, 014606 (2010)

M.Avrigeanu, V.Avrigeanu

α-particle nuclear surface absorption below the Coulomb barrier in heavy nuclei

NUCLEAR REACTIONS 113,115In, 121,123Sb, 139La, 141Pr, 150Nd, 159Tb, 165Ho, 169Tm, 181Ta, 191Ir, 192Os, 197Au(α, n), 113,115In, 127I, 136Xe, 139La, 144Sm, 197Au(α, γ), 121Sb(α, 2n), E=8-25 MeV; analyzed σ using optical model potential (OMP). Energy dependence of the surface imaginary potential depth.

doi: 10.1103/PhysRevC.82.014606
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2010AV09      J.Phys.:Conf.Ser. 205, 012014 (2010)

M.Avrigeanu, V.Avrigeanu

Deuteron breakup effects on activation cross sections at low and medium energies

NUCLEAR REACTIONS 27Al(d, d), E=5-15 MeV; calculated σ(θ) using optical model with three different potentials; deduced optical model parameters. 27Al, 63,65Cu(d, X), (d, np), E=3-60 MeV; calculated σ. 27Al(d, n), (d, p), (d, α), (d, 2n), (d, 2p), (d, pα), E=3-60 MeV; calculated σ using different computer codes. Compared with available data.

doi: 10.1088/1742-6596/205/1/012014
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2009AV01      Phys.Rev. C 79, 027601 (2009)

M.Avrigeanu, V.Avrigeanu

α-particle optical potential tests below the Coulomb barrier

NUCLEAR REACTIONS 92Mo, 94Mo, 112Sn(α, n), (α, X), E(c.m.)=7.5-11.5 MeV; 117Sn, 118Sn(α, γ), (α, X), E(c.m.)=7.5-11.5 MeV; 117Sn(α, p)120mSb, E(c.m.)=7.5-11.5 MeV 121Sb(p, n), (p, p'), (p, γ), E(c.m.)=4.5-9.5 MeV; calculated σ using different α-particle optical potential parameters. Discussed limitations of statistical-model calculations. Comparisons with experimental data.

doi: 10.1103/PhysRevC.79.027601
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2009AV03      At.Data Nucl.Data Tables 95, 501 (2009)

M.Avrigeanu, A.C.Obreja, F.L.Roman, V.Avrigeanu, W.von Oertzen

Complementary optical-potential analysis of α-particle elastic scattering and induced reactions at low energies

COMPILATION A=50-120; 45Sc, 118Sn(α, γ), (α, n), (α, p); Analyzed reaction σ. Double Folding Model.

doi: 10.1016/j.adt.2009.02.001
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2009BE16      Phys.Rev. C 79, 044610 (2009)

P.Bem, E.Simeckova, M.Honusek, U.Fischer, S.P.Simakov, R.A.Forrest, M.Avrigeanu, A.C.Obreja, F.L.Roman, V.Avrigeanu

Low and medium energy deuteron-induced reactions on 27Al

NUCLEAR REACTIONS 27Al(d, p), (d, 2p), (d, pα), E=3.38-20.18 MeV; 63Cu(d, 2n), E=4-20 MeV; measured excitation functions. 27Al(d, n), (d, 2n), (d, α), E<25 MeV; comparison of cross section data. Comparison with calculations from TALYS and ACSELAM computer codes, and experimental data.

doi: 10.1103/PhysRevC.79.044610
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetD0453.


2009NO12      Nucl.Phys. A831, 106 (2009)

G.Noguere, E.Rich, C.De Saint Jean, O.Litaize, P.Siegler, V.Avrigeanu

Average neutron parameters for hafnium

NUCLEAR REACTIONS 174,176,177,178,179,180Hf(n, γ), E=0.002-50 keV; measured transmission and capture σ at the GELINA white neutron source facility; deduced resonance parameters using Reich-Moore interpretation and the REFIT code. Comparison with data.

doi: 10.1016/j.nuclphysa.2009.08.011
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2008AV03      Nucl.Phys. A806, 15 (2008)

M.Avrigeanu, S.V.Chuvaev, A.A.Filatenkov, R.A.Forrest, M.Herman, A.J.Koning, A.J.M.Plompen, F.L.Roman, V.Avrigeanu

Fast-neutron induced pre-equilibrium reactions on 55Mn and 63, 65Cu at energies up to 40 MeV

NUCLEAR REACTIONS 55Mn, 63,65Cu(n, X), (n, γ), E=0.001?50 MeV; 52,53,54Cr, 55Mn, 54,56,57,58Fe, 59Co, 58,60,61,62,64Ni, 63,65Cu, 64,66,68Zn(p, X), (p, n), (p, γ), E=1?20 MeV; analyzed total, activation and capture σ and particle emission spectra using an optical model with emphasis on pre-equilibrium emission. Comparison with all available data.

doi: 10.1016/j.nuclphysa.2008.03.010
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2006AV01      Nucl.Phys. A765, 1 (2006)

V.Avrigeanu, S.V.Chuvaev, R.Eichin, A.A.Filatenkov, R.A.Forrest, H.Freiesleben, M.Herman, A.J.Koning, K.Seidel

Pre-equilibrium reactions on the stable tungsten isotopes at low energy

NUCLEAR REACTIONS 180,186W(n, 2n), 182,183,184,186W(n, p), (n, α), 186W(n, n'α), E=13.4-14.9 MeV; measured Eγ, Iγ, activation σ. 181Ta(p, n), E=0-50 MeV; 180,182,183,184,186W, 181Ta(n, γ), E=0-3 MeV; analyzed σ. Comparison with model predictions.

doi: 10.1016/j.nuclphysa.2005.10.003
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2006AV02      Nucl.Phys. A764, 246 (2006)

M.Avrigeanu, W.von Oertzen, V.Avrigeanu

On temperature dependence of the optical potential for alpha-particles at low energies

NUCLEAR REACTIONS 92,95,98,100Mo(n, α), 89,96Zr(α, n), E < 20 MeV; analyzed σ; deduced parameters, temperature dependence features. Woods-Saxon potential and optical model.

doi: 10.1016/j.nuclphysa.2005.10.001
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2006AV03      Phys.Rev. C 73, 038801 (2006)

M.Avrigeanu, V.Avrigeanu

Addendum to "Elastic α-scattering on 112Sn and 124Sn at astrophysically relevant energies"

NUCLEAR REACTIONS 112Sn(α, α), E=14.4, 19.5 MeV; 124Sn(α, α), E=19.5 MeV; analyzed elastic σ(θ); deduced improved optical potential parameters.

doi: 10.1103/PhysRevC.73.038801
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2005AV06      Nucl.Phys. A759, 327 (2005)

M.Avrigeanu, W.von Oertzen, U.Fischer, V.Avrigeanu

Analysis of deuteron elastic scattering on 6, 7Li up to 50 MeV

NUCLEAR REACTIONS 6,7Li(d, d), E=3-50 MeV; analyzed angular distributions; deduced optical model parameters.

doi: 10.1016/j.nuclphysa.2005.05.153
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2005RE09      Phys.Rev. C 71, 044617 (2005)

P.Reimer, V.Avrigeanu, S.V.Chuvaev, A.A.Filatenkov, T.Glodariu, A.Koning, A.J.M.Plompen, S.M.Qaim, D.L.Smith, H.Weigmann

Reaction mechanisms of fast neutrons on stable Mo isotopes below 21 MeV

NUCLEAR REACTIONS 92,94Mo(n, 2n), 92,100Mo(n, α), 95,96,97Mo(n, p), 96,97,98Mo(n, np+d), E ≈ 13.5-21 MeV; measured activation σ; deduced reaction mechanism features. 93Nb(p, n), (p, γ), E ≈ 1-6 MeV; 92,93,94,95,96,97,98,100Mo, 93Nb(n, γ), E < 4 MeV; 92,94,100Mo(n, 2n), 92,94,95,96,97,98Mo(n, p), 92,94,95,96,97,98,100Mo(n, np+d), 92,98,100Mo(n, α), E < 21 MeV; compiled, analyzed σ. Analysis with local and global approaches compared.

doi: 10.1103/PhysRevC.71.044617
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset22889.


2004SE01      Nucl.Phys. A730, 255 (2004)

V.Semkova, V.Avrigeanu, T.Glodariu, A.J.Koning, A.J.M.Plompen, D.L.Smith, S.Sudar

A systematic investigation of reaction cross sections and isomer ratios for neutrons up to 20 MeV on Ni-isotopes and 59Co by measurements with the activation technique and new model studies of the underlying reaction mechanisms

NUCLEAR REACTIONS 58,60,61Ni(n, p), 58,61Ni(n, np+d), 58Ni, 59Co(n, 2n), E=14-20 MeV; 58Ni(n, p), E=1-3.5 MeV; measured production σ, isomer ratios; deduced parameters, reaction mechanism features. Activation technique, comparison with model predictions and previous results.

doi: 10.1016/j.nuclphysa.2003.11.005
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2003AV04      Nucl.Phys. A723, 104 (2003)

M.Avrigeanu, W.von Oertzen, A.J.M.Plompen, V.Avrigeanu

Optical model potentials for α-particles scattering around the Coulomb barrier on A ∼ 100 nuclei

NUCLEAR REACTIONS 4He(α, α), E < 35 MeV; analyzed σ(θ); deduced density distribution. 89Y, 90,91Zr, 92,94,96,98,100Mo, 107Ag, 116,122,124Sn(α, α), E ≈ 14-32 MeV; analyzed σ(θ); deduced optical potential features.

doi: 10.1016/S0375-9474(03)01159-X
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2002AV02      Int.J.Mod.Phys. E11, 249 (2002)

M.Avrigeanu, G.S.Anagnostatos, A.N.Antonov, V.Avrigeanu

Elastic Scattering as a Test of Density Distributions in 6He and 8He

NUCLEAR REACTIONS 1H(6He, 6He), (8He, 8He), E = 25-72 MeV/nucleon; calculated σ(θ), optical potential features. 6,8He deduced matter density distribution features. Comparison with data.

doi: 10.1142/S021830130200082X
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2002RE01      Phys.Rev. C65, 014604 (2002)

P.Reimer, V.Avrigeanu, A.J.M.Plompen, S.M.Qaim

Reaction Mechanisms of Fast Neutrons on 51V Below 21 MeV

NUCLEAR REACTIONS 51V(n, p), (n, α), E=11.7-20.5 MeV; V(n, αX)47Sc, E=11.7-20.5 MeV; measured σ; deduced reaction mechanism features. Comparisons with model predictions.

doi: 10.1103/PhysRevC.65.014604
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2002RE19      Nucl.Phys. A705, 265 (2002)

P.Reimer, M.Hult, A.J.M.Plompen, P.N.Johnston, V.Avrigeanu, S.M.Qaim

Measurement of the natMo(n, x)94Nb Cross Section using Ultra Low-Level γ-Ray Spectrometry at HADES

NUCLEAR REACTIONS Mo(n, X)94Nb, E=14.5, 18.0, 20.3 MeV; measured delayed Eγ, Iγ, activation σ. Ultra low-level gamma-ray spectroscopy.

doi: 10.1016/S0375-9474(02)00653-X
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2000AV05      Trans.Bulg.Nucl.Soc. 5, 3 (2000)

M.Avrigeanu, I.Stetcu, V.Avrigeanu

Realistic Effective NN Interactions for Multistep Direct Reactions to the Continuum

NUCLEAR REACTIONS 90Zr, 93Nb, 96,98,100Mo(n, n), E=17-26 MeV; 90Zr, 93Nb(p, p), E=22 MeV; calculated σ(θ). 90Zr(p, n), E=25.6 MeV; 94,95,96,97,98,100Mo(p, xn), E=25.6 MeV; calculated σ(E, θ). Multistep direct reaction theory, several effective interactions compared. Comparisons with data.


1999AV04      Phys.Rev. C60, 017602 (1999)

V.Avrigeanu, S.Sudar, Cs.M.Buczko, J.Csikai, A.A.Filatenkov, S.V.Chuvaev, R.Doczi, V.Semkova, V.A.Zelenetsky

Energy Dependence of the Isomeric Cross Section Ratio in the 58Ni(n, p)58Com, g Reactions

NUCLEAR REACTIONS 58Ni(n, p), E=2.1-14.9 MeV; measured σ, isomer production ratio. 58Co deduced transition δ. Activation technique.

doi: 10.1103/PhysRevC.60.017602
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1998AV04      Comput.Phys.Commun. 112, 191 (1998)

M.Avrigeanu, V.Avrigeanu

Partial Level Densities for Nuclear Data Calculations

NUCLEAR STRUCTURE 23C; calculated partial level densities vs excitation energy. Equidistant spacing model. Application to pre-equilibrium reaction models discussed.

doi: 10.1016/S0010-4655(98)00050-2
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1998HA33      Phys.Rev. C58, 295 (1998)

A.Harangozo, I.Stetcu, M.Avrigeanu, V.Avrigeanu

Particle-Hole State Densities with Nonequidistant Single-Particle Levels

doi: 10.1103/PhysRevC.58.295
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1997AV02      Phys.Rev. C56, 1633 (1997)

M.Avrigeanu, A.Harangozo, V.Avrigeanu, A.N.Antonov

Average Strength of the Effective Interaction in Multistep Direct Reactions

NUCLEAR REACTIONS 93Nb(p, p'), (n, n'), E=20-80 MeV; calculated first NN-collision probability radial dependence, effective NN interaction strengths; deduced surface effects, nuclear density dependence features. Optical model potential, local density approximation.

doi: 10.1103/PhysRevC.56.1633
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1997DI07      J.Phys.(London) G23, 961 (1997)

S.S.Dimitrova, G.Z.Krumova, P.E.Hodgson, V.Avrigeanu, A.N.Antonov

(n, d)-Reactions on Medium Mass Nuclei

NUCLEAR REACTIONS 58Ni, 63,65Cu(n, d), E=6-16 MeV; analyzed σ(E); deduced reaction mechanism. Hauser-Feshbach statistical model, pick-up, knockout mechanisms.

doi: 10.1088/0954-3899/23/8/010
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1996AV03      Roum.J.Phys. 41, 7 (1996)

V.Avrigeanu, A.Florescu, T.Glodariu, A.Sandulescu

Level Density Effect on Cold-Fission Yields of 234U

NUCLEAR REACTIONS 233U(n, F), E=thermal; analyzed cold fission yields data; deduced level density effects role.


1996AV04      Roum.J.Phys. 41, 77 (1996)

M.Avrigeanu, A.Harangozo, V.Avrigeanu

Surface Effects in Feshbach-Kerman-Koonin Analysis of (n, n') and (n, p) Reactions at 7 to 26 MeV

NUCLEAR STRUCTURE A=45-94; analyzed resonance data; deduced level density parameters.

NUCLEAR REACTIONS 93Nb(n, 2n), (n, α), (n, 3n), E < 24 MeV; analyzed σ(E). 93Nb(n, n'), E=7 MeV; 93Nb(n, xn), E=14.1-25.7 MeV; 93Nb(n, xp), E=14.1, 15 MeV; 93Nb(n, xα), E=14.1, 15 MeV; analyzed particle emission spectra. 56Fe, 48Ti, 93Nb(n, n'), 93Nb(n, p), E=14.1 MeV; 56Fe(n, n'), E=25.7 MeV; 93Nb(n, n'), E=7-25.7 MeV; analyzed σ(θ, E(nucleon)). Ti(n, xn), 46,48Ti(n, xp), E=14.1 MeV; analyzed angle integrated spectra; deduced surface effects role. Feshbach-Kerman-Koonin approach, other aspects of these reactions also included.


1996AV05      Phys.Rev. C54, 2538 (1996)

M.Avrigeanu, A.Harangozo, V.Avrigeanu, A.N.Antonov

Nuclear Surface Localization of Preequilibrium Reactions at Low Energies

NUCLEAR REACTIONS 93Nb(n, n'), E=10-50 MeV; calculated first NN-collision probability, average local Fermi energy, other aspects in preequilibrium reactions.

doi: 10.1103/PhysRevC.54.2538
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1995AV03      J.Phys.(London) G21, 837 (1995)

M.Avrigeanu, V.Avrigeanu, A.N.Antonov, M.B.Chadwick, P.E.Hodgson, M.V.Stoitsov

Pauli-Blocking Effects in Neutron-Alpha Reactions

NUCLEAR REACTIONS 54Fe, 51V, 55Mn, 59Co, 48Ti, 52Cr(n, α), E ≈ 4-20 MeV; analyzed σ(E); deduced model parameters variations range limitations, Pauli-blocking effects.

doi: 10.1088/0954-3899/21/6/011
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1995AV05      Phys.Rev. C52, R1755 (1995)

V.Avrigeanu, A.Florescu, A.Sandulescu, W.Greiner

Cold-Fission Yields at Effective Excitation Energies

NUCLEAR REACTIONS 233U(n, F), E=thermal; analyzed cold fission fragment yields vs total excitation energy. Ground state potential barrier penetrabilities, WKB approximation.

NUCLEAR STRUCTURE 90Y, 90Zr, 90Nb, 92Zr; calculated nuclear level density parameters. Back-shifted Fermi gas model.

doi: 10.1103/PhysRevC.52.R1755
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1995AV06      Roum.J.Phys. 40, 453 (1995)

M.Avrigeanu, A.Harangozo, V.Avrigeanu

Surface Effects in Multistep Reaction Calculations

NUCLEAR REACTIONS 56Fe(n, xn), (n, xp), E=14.8 MeV; 48Ti(n, xn), E=14.1 MeV; 46,48Ti(n, xp), E=14.8 MeV; calculated angle integrated proton, neutron emission spectra. Feschbach-Kerman-Koonim theory, surface effects.


1994AV01      Phys.Rev. C49, 2136 (1994)

V.Avrigeanu, P.E.Hodgson, M.Avrigeanu

Global Optical Potentials for Emitted Alpha Particles

NUCLEAR REACTIONS 54Fe, 52Cr, 59Co, 48,50Ti, 51V(n, α), E < 10 MeV; calculated σ(E). 40Ca, 55Mn, 59Co(α, X), E < 13 MeV; calculated reaction σ(E). Global optical potentials.

doi: 10.1103/PhysRevC.49.2136
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1994AV02      J.Phys.(London) G20, 613 (1994)

M.Avrigeanu, V.Avrigeanu

Energy-Dependent Single-Particle State Density Effects in the Hybrid Model of Pre-Equilibrium Nuclear Reactions

NUCLEAR REACTIONS 51V, 56Fe(n, xn), (n, xp), (n, xα), E=14.1 MeV; calculated angle integrated σ vs excitation energy. 56Fe, 51V(n, p), (n, 2n), (n, α), E=threshold-20 MeV; calculated reaction σ(E). Fermi gas model type energy dependences of single-hole, excited-particle densities, preequilibrium, hybrid models.

doi: 10.1088/0954-3899/20/4/009
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1993AV04      Roum.J.Phys. 38, 407 (1993)

M.Avrigeanu, V.Avrigeanu

Energy-Dependent Single-Particle State Density

NUCLEAR STRUCTURE 56,57Fe, 56Mn; calculated particle-hole state density. Different models.


1992AV02      Rev.Roum.Phys. 37, 139 (1992)

V.Avrigeanu

Nuclear Structure Effects on Calculated Fast Neutron Reaction Cross Sections

NUCLEAR REACTIONS 58Ni(n, p), (n, α), (n, 2n), (n, n'p), E=threshold-24 MeV; 53,52Cr(n, p), E=threshold-20 MeV; calculated σ(E); deduced low-lying level density role. Statistical model, preequilibrium emission.


1990AV01      Z.Phys. A335, 299 (1990)

M.Avrigeanu, M.Ivascu, V.Avrigeanu

Nuclear Level Densities Below 40 MeV Excitation Energy in the Mass Region A ≈ 50

NUCLEAR STRUCTURE A=50-65; analyzed resonance data; deduced level density, other parameters.

NUCLEAR REACTIONS, ICPND 52Cr, 56,54Fe, 58,60Ni(n, n'), E=2-20 MeV; calculated inelastic σ(E). 51V(α, X), (α, n), E=5.5-12 MeV; calculated reaction σ(E). 52,50Cr, 54,56Fe, 58,60Ni(n, xp), E ≈ 14.8 MeV; 50,52Cr, 54,56Fe, 58,60Ni(n, xα), E ≈ 14.5 MeV; calculated angle integrated particle emission spectra. 52,50Cr(n, 2n), E ≈ 13-20 MeV; 52Cr(n, p), (n, α), E ≈ 5-19 MeV; 53Cr(n, p), E ≈ 5-20 MeV; 61,58Ni, 54Fe(n, p), E ≈ 2-20 MeV; 54Fe(n, α), E ≈ 4-20 MeV; 58Ni, 54Fe(n, 2n), E ≈ 14-20 MeV; 56Fe(n, 2n), E=11-22 MeV; 60Ni, 56Fe(n, p), E ≈ 5-20 MeV; 58Ni(n, np), E ≈ 10-20 MeV; 62Ni(n, p), (n, α), E ≈ 6-20 MeV; calculated reaction σ(E). Statistical model.


1989AV03      J.Phys.(London) G15, L241 (1989)

M.Avrigeanu, D.Bucurescu, M.Ivascu, G.Semenescu, V.Avrigeanu

On the Overlap of the Pre-Equilibrium and Direct Reaction Models

NUCLEAR REACTIONS 54,56Fe(n, n'), E=11 MeV; calculated σ. 56Fe(n, n'), E ≈ 14 MeV; calculated neutron emission spectra. Preequilibrium, direct reaction models overlap.

doi: 10.1088/0954-3899/15/11/004
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1989AV04      J.Phys.(London) G15, L261 (1989)

M.Avrigeanu, V.Avrigeanu

Consistent Exciton State and Nuclear Level Densities

NUCLEAR REACTIONS 50,52Cr, 54,56Fe, 58,60Ni(n, xp), E=15 MeV; 56Fe, 60Ni(n, xα), E=14.5 MeV; calculated angle integrated proton emission spectra. Consistent exciton state, nuclear level densities.

ATOMIC PHYSICS, Mesic-Atoms 56Mn, 56,57Fe; calculated one-, two-fermion exciton state densities. Comparison with nuclear state densities.

doi: 10.1088/0954-3899/15/12/001
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1988AV04      Z.Phys. A329, 177 (1988)

M.Avrigeanu, M.Ivascu, V.Avrigeanu

Pre-Equilibrium Emission in Neutron Induced Reactions on 54,56Fe

NUCLEAR REACTIONS 54,56Fe(n, p), (n, xp), (n, α), (n, xα), (n, xn), (n, 2n), E=20 MeV; 54,56Fe(n, p), (n, α), E=14.8 MeV; calculated σ(En), σ(θp, Ep), σ(θn, En), angle integrated σ. Hybrid preequilibrium emission model.


1987AV07      Rev.Roum.Phys. 32, 837 (1987)

M.Avrigeanu, V.Avrigeanu, G.Cata, M.Ivascu

EDBW Model for the E1 Gamma-Ray Strength Function in the Mass Region 50 ≤ A ≤ 90

NUCLEAR STRUCTURE A=40-240; analyzed GDR data; deduced E1 strength function nuclear deformation dependence for A=50-90.


1987IV03      Rev.Roum.Phys. 32, 697 (1987)

M.Ivascu, V.Avrigeanu, M.Avrigeanu

Nuclear Level Densities in the Mass Range 40 < A < 65

NUCLEAR STRUCTURE A=40-70; calculated level densities. Back shifted Fermi gas model.


1987IV04      Rev.Roum.Phys. 32, 713 (1987)

M.Ivascu, M.Avrigeanu, V.Avrigeanu

A Geometry Dependent Hybrid Pre-Equilibrium Emission Model with Conservation of Angular Momentum

NUCLEAR REACTIONS 46,48Ti(n, np), E=15 MeV; calculated angle integrated σ. Geometry dependent hybrid preequilibrium model.


1986IV02      Radiat.Eff. 95, 207 (1986)

M.Ivascu, M.Avrigeanu, V.Avrigeanu

Preequilibrium and Statistical Model Calculations for Neutron Activation Cross Sections on Titanium Isotopes

NUCLEAR REACTIONS 46,47,48,49,50Ti(n, p), (n, n'p), (n, 2n), E=threshold-20 MeV; calculated σ(E). Hauser-Feshbach, optical model, preequilibrium emission.

doi: 10.1080/00337578608208697
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1986IV03      Radiat.Eff. 95, 211 (1986)

M.Ivascu, M.Avrigeanu, V.Avrigeanu

Level Density Shell Effects in Neutron Induced Reactions on Molybdenum Isotopes

NUCLEAR REACTIONS 92,94,95,96,97,98,100Mo(n, p), (n, n'p), (n, 2n), E=threshold-20 MeV; calculated σ(En), binding energies; deduced isotopic effects. Preequilibrium, statistical models.

doi: 10.1080/00337578608208698
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1978AN30      Hyperfine Interactions 4, 190 (1978)

A.Anghelescu, V.Avrigeanu, E.Bodo, C.Ciortea, B.Constantinescu, I.David, P.Osiceanu, D.Pantelica, A.Petrovici, M.Petrovici, S.Vajda, M.Zaharcu

Recoil Into Vacuum g Factor Measurement of the 5/2+ State at 0.350 MeV in 21Ne

NUCLEAR REACTIONS 7Li(16O, d), E=22, 35 MeV; measured Doppler-shifted Eγ, Iγ(θ). 21Ne deduced level T1/2, g factor. Recoil-distance technique.

doi: 10.1007/BF01021822
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1978AV02      J.Phys.(London) G4, 261 (1978)

M.Avrigeanu, V.Avrigeanu, D.Bucurescu, G.Constantinescu, M.Ivascu, D.Pantelica, M.Tanase, N.V.Zamfir

Lifetime Measurements in 86Zr

NUCLEAR REACTIONS 73Ge(16O, 3n), E=52.0 MeV; measured σ(Eγ, θ), DSA. 86Zr levels deduced T1/2. Enriched target, Ge(Li) detector.

doi: 10.1088/0305-4616/4/2/015
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1978IV02      Rev.Roum.Phys. 23, 163 (1978)

M.Ivascu, D.Bucurescu, G.Constantinescu, M.Avrigeanu, V.Avrigeanu

On the High-Spin Sates of 83Sr and 85Sr

NUCLEAR REACTIONS 74,76Ge(12C, 3nγ), (12C, xnγ), (12C, xnαγ), E=35-45 MeV; measured σ(E, Eγ). 83,85Sr deduced transitions.


1977AN26      Rev.Roum.Phys. 22, 859 (1977)

A.Anghelescu, V.Avrigeanu, E.Bodo, C.Ciortea, B.Constantinescu, I.David, P.Osiceanu, O.Pantelica, A.Petrovici, M.Petrovici, S.Vajda, M.Zaharcu

Hyperfine Interactions in Highly Ionized 21Ne Atoms and the Magnetic Moment of the 5/2+ State at 0.350 MeV

NUCLEAR REACTIONS 7Li(16O, d), E=22, 35 MeV; measured recoil distance, γ(θ). 21Ne level deduced T1/2, g.


1976AV06      Nucl.Phys. A272, 243 (1976)

V.Avrigeanu, D.Bucurescu, G.Constantinescu, E.Dragulescu, M.Ivascu, D.Pantelica, R.Teodorescu

Spectroscopy of High Spin States in 52Mn

NUCLEAR REACTIONS 39K(16O, n2pγ), E=37-52 MeV; measured pγ-, γγ-coin, σ(E, Eγ), σ(Eγ, θ), recoil distance, DSA. 52Mn levels deduced J, π, δ, γ-branching, T1/2. Natural target.

doi: 10.1016/0375-9474(76)90329-8
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1975AV03      Rev.Roum.Phys. 20, 959 (1975)

V.Avrigeanu, D.Bucurescu, E.Dragulescu, M.Ivascu, D.Popescu

Excited States of the 37Cl Nucleus

NUCLEAR REACTIONS 37Cl(p, p'), E=15.0 MeV; 34S(α, p), E=18.0 MeV; measured σ. 37Cl deduced levels, J, π, L.


1974AV06      Rev.Roum.Phys. 19, 561 (1974)

V.Avrigeanu, D.Bucurescu, E.Dragulescu, M.Ivascu, D.Popescu

Study of 37Cl Nucleus by Proton Scattering

NUCLEAR REACTIONS 37Cl(p, p'), E=15 MeV; measured σ(Ep', θ). 37Cl deduced levels.


1974IV01      Nucl.Phys. A218, 104 (1974)

M.Ivascu, D.Popescu, E.Dragulescu, V.Avrigeanu, C.Besliu, N.Martalogu

Lifetimes of Some Excited States in 64Ni, 66Zn and 68Zn

NUCLEAR REACTIONS 64Ni, 66,68Zn(α, α'γ), 63,65Cu(α, pγ), Eα=13 MeV; measured Doppler-shift attenuation. 64Ni, 66Zn, 68Zn deduced levels, T1/2. Enriched targets.

doi: 10.1016/0375-9474(74)90023-2
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1974IV03      Nucl.Phys. A225, 357 (1974)

M.Ivascu, D.Bucurescu, D.Popescu, V.Avrigeanu, E.Dragulescu, G.Semenescu, M.Avrigeanu

Spectroscopy of the 69Ga and 71Ga Isotopes with the 69,71Ga(α, α'γ)69,71Ga and 66,68Zn(α, pγ)69,71Ga Reactions

NUCLEAR REACTIONS 69,71Ga(α, α'γ), 66,68Zn(α, pγ), E=13 MeV; measured Eγ, Doppler shift attenuation. 69,71Ga levels deduced T1/2, E(X). Enriched targets.

doi: 10.1016/0375-9474(74)90546-6
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