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NSR database version of April 29, 2024.

Search: Author = E.Vagena

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2021HA34      Phys.Rev. C 104, 025804 (2021)

S.Harissopulos, E.Vagena, P.Dimitriou, M.Axiotis, S.Galanopoulos, V.Foteinou, A.Lagoyannis

Cross section measurements of proton capture reactions on Sr isotopes for astrophysics applications

NUCLEAR REACTIONS ^86,87,88Sr(p, γ)⁸⁷Y/⁸⁸Y/⁸⁹Y, E=1.5-5 MeV; measured Eγ, Iγ, γ(θ), 4π γ-summing, σ(E, Eγ) at the 4 MV Dynamitron of University of Stuttgart, or Dynamitron-Tandem-Laboratorium (DTL) of Ruhr-Universitat, Bochum. ^87,88,89Y; deduced levels, J, π, astrophysical S factors. ^84,86,87,88Sr(p, γ)⁸⁵Y/^85mY/⁸⁷Y/^87mY/⁸⁸Y/⁸⁹Y/^89mY, E=1.3-3.8 MeV; analyzed present and previous experimental data; deduced σ(E) and astrophysical S factors, and compared with Hauser-Feshbach (HF) theoretical calculations using TALYS 1.95 with combinations of optical model parameters (OMP), nuclear level density (NLD) models, and γ-strength functions (γSF) models. Discussed uncertainties arising from global nuclear models for a wide range of relevant nuclei. Relevance to discrepancies between the observed abundances of p-nuclei in the solar system and those predicted by different astrophysical models of the p-process.

doi: 10.1103/PhysRevC.104.025804
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO0316.

2021VA04      Phys.Rev. C 103, 045806 (2021)

E.Vagena, M.Axiotis, P.Dimitriou

Systematics of the semimicroscopic proton-nucleus optical potential at low energies relevant for nuclear astrophysics

NUCLEAR REACTIONS ^47,48,49Ti, ⁵¹V, ^53,54Cr, ⁵⁸Fe, ⁵⁹Co, ^60,61Ni, ⁶⁵Cu, ⁷⁴Ge, ⁷⁷Se, ^86,87,88Sr, ⁸⁹Y, ⁹²Zr, ^92,94,96,98Mo, ⁹⁸Ru, ^104,106Pd, ¹⁰⁸Cd, ¹²⁰Te, ¹³⁰Ba, ¹⁵²Gd, ¹⁶²Er(p, γ), E=1-6 MeV; calculated σ(E) using all possible γ-strength functions γSFs (Kopecky-Uhl, Brink-Axel, HFBCS/QRPA, HFB/QRPA, hybrid-Goriely, HFB/T, RMF/T, DIM/HFB/QRPA) and all possible nuclear density (NLDs) models (CTFG, BSF, GSM, HFBCS, HFB, HFB/T) available in TALYS code; deduced proton-nucleus optical model potentials (pOMPs); compared experimental data for cross sections with TALYS calculations using standard JLM/B potentials, and adjusted JLM/B pOMPs. ⁴⁹Ti, ⁵¹V, ^53,54Cr, ⁵⁵Mn, ^57,58Fe, ⁵⁹Co, ⁶⁵Cu, ⁶⁷Zn, ⁷¹Ga, ⁷⁶Ge, ⁷⁵As, ^77,80,82Se, ^79,81Br, ^85,87Rb, ⁸⁷Sr, ^92,94,96Zr, ⁹³Nb, ^95,96,98,100Mo, ¹⁰³Rh, ¹¹⁰Pd, ^107,109Ag, ^111,116Cd, ¹¹⁵In, ^{117,119,122,124}Sn, ^128,130Te, ¹²⁷I, ¹³⁹La, ¹⁴²Ce, ^147,149Sm, ^151,153Eu, ¹⁶⁹Tm, ¹⁸¹Ta(p, n), E=1.2-5.6 MeV; calculated σ(E) using TALYS code with standard JLM/B potentials, and adjusted JLM/B pOMPs, and compared with experimental data; deduced ratios of Maxwellian-averaged cross sections (MACS) between the modified and default JLM model at 1.5 and 3 GK. Hauser-Feshbach calculations using the TALYS nuclear reaction code. ^47,48,49Ti, ⁵¹V, ⁵⁹Co, ⁷⁷Se, ⁹⁸Ru, ^120,122Sn, ^125,126Te, ¹³⁰Ba, ¹⁴²Nd, ¹⁴⁴Sm, ¹⁹⁷Au(p, γ); ⁵⁸Fe, ⁶⁷Zn, ⁶⁹Ga, ⁸⁷Rb, ^94,96Zr, ¹⁰⁰Mo, ¹²⁸Te, ¹³⁹La, ¹⁴²Ce, ¹⁵³Eu, ¹⁹⁶Pt, ¹⁹⁷Au(p, n); recommended reactions for measurement of cross sections at low energies, where available experimental data found to be either problematic or non-existent. Relevance to astrophysical models studying the origin of the neutron-deficient nuclides by rp and p processes.

doi: 10.1103/PhysRevC.103.045806
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2020GE04      Phys.Rev. C 102, 034610 (2020)

E.Georgali, N.Patronis, A.Anastasiadis, X.Aslanoglou, M.Axiotis, Z.Eleme, S.Harissopulos, A.Kalamara, K.Karfopoulos, M.Kokkoris, A.Lagoyannis, M.Peoviti, C.Potiriadis, M.I.Savva, I.E.Stamatelatos, M.E.Stamati, A.Stamatopoulos, E.Vagena, T.Vasilopoulou, R.Vlastou

Experimental study of the ¹⁶⁵Ho(n, 2n) reaction: Cross section measurements for the population of the ¹⁶⁴Ho ground state and isomeric state from the threshold up to 20 MeV

NUCLEAR REACTIONS ¹⁶⁵Ho(n, 2n)¹⁶⁴Ho/^164mHo, E=10.1, 10.4, 10.7, 17.1, 18.1, 19.0, 19.6 MeV neutrons generated at the 5.5 MV Tandem Van de Graaff accelerator of N.C.S.R. "Demokritos"; measured Eγ, Iγ, σ(E) for the population of the ground state and isomeric state of ¹⁶⁴Ho, relative to ¹⁹⁷Au(n, 2n)¹⁹⁶Au and ²⁷Al(n, α)²⁴Na reactions, using γ-activation method. Comparison of present and previous experimental results with theoretical calculations using the TALYS code with different level density models.

doi: 10.1103/PhysRevC.102.034610
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset23762.

2018GE02      Phys.Rev. C 98, 014622 (2018)

E.Georgali, Z.Eleme, N.Patronis, X.Aslanoglou, M.Axiotis, M.Diakaki, V.Foteinou, S.Harissopulos, A.Kalamara, M.Kokkoris, A.Lagoyannis, N.G.Nicolis, G.Provatas, A.Stamatopoulos, S.Stoulos, A.Tsinganis, E.Vagena, R.Vlastou, S.M.Vogiatzi

The (n, 2n) reaction for the lightest stable erbium isotope ¹⁶²Er from reaction threshold up to 19 MeV

NUCLEAR REACTIONS ¹⁶²Er(n, 2n), E=10.7, 11.0, 11.3, 17.1, 18.1, 19.0 MeV; measured Eγ, Iγ, σ(E) by activation method at the Tandem Van de Graaff accelerator of NCSR "Demokritos". Comparison with theoretical calculations using TALYS, EMPIRE and MECO codes, and with ENDF/B-VIII.0 evaluation. ^{162,164,166,167,168,170}Er(n, 2n), E<20 MeV; calculated σ(E) using statistical model code TALYS, and compared with available experimental data, and with evaluated data in ENDF/B-VIII.0 library.

doi: 10.1103/PhysRevC.98.014622
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset23418.

2018ST16      Nucl.Phys. A980, 1 (2018)

S.Stoulos, E.Vagena

Indirect measurement of bremsstrahlung photons and photoneutrons cross sections of ²⁰⁴Pb and Sb isotopes compared with TALYS simulations

doi: 10.1016/j.nuclphysa.2018.09.081
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2018VA16      Eur.Phys.J. A 54, 153 (2018)

E.Vagena, S.Stoulos

Ytterbium (γ, n) average cross-sections data near to photodisintegration reaction threshold

NUCLEAR REACTIONS ^168,170,176Yb(γ, n), E=6.0-14.0 MeV[bremsstrahlung end-point energy]; measured bremsstrahlung induced activation Eγ, Iγ; deduced energy range E_range, mean energy E_mean, effective σ_eff using thick foil activation technique; calculated effective σ_eff, σ vs E using TALYS; compared with data.

doi: 10.1140/epja/i2018-12583-5
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetG0061.

2017VA01      Nucl.Phys. A957, 259 (2017)

E.Vagena, S.Stoulos

Average cross section measurement for ¹⁶²Er (γ, n) reaction compared with theoretical calculations using TALYS

NUCLEAR REACTIONS ⁵⁵Mn, ⁵⁶Ni, ⁷⁵As, ⁷⁴Se, ¹¹²Sn, ¹⁶²Er, ¹⁹¹Ir, ¹⁹⁷Au(γ, n), E=threshold-14 MeV[bremsstrahlung end-point energy]; measured bremsstrahlung-induced off-line Eγ, Iγ, X-ray using HPGe; deduced σ; calculated σ using TALYS 1.6 with different γ-ray strength functions and special attention to p-nucleus ¹⁶²Er. ^{162,164,166,167,168,170}Er, Er; calculated σ. Cross sections of all reactions compared also with EXFOR data.

doi: 10.1016/j.nuclphysa.2016.09.007
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetG0053.

2017VA10      Eur.Phys.J. A 53, 85 (2017)

E.Vagena, S.Stoulos

Photodisintegration average cross sections of dysprosium p-nuclei near (γ , n) reaction threshold

NUCLEAR REACTIONS ^156,158Dy(γ, n), E≈threshold-14 MeV[from bremsstrahlung]; measured bremsstrahlung induced activation Eγ, Iγ; deduced near-threshold σ for reactions leading to Dy isotopes; calculated σ using TALYS-1.6 with different γ strength functions.

doi: 10.1140/epja/i2017-12278-5
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetG0055.

2012MA68      J.Phys.:Conf.Ser. 366, 012033 (2012)

M.Manolopoulou, M.Fragopoulou, S.Stoulos, E.Vagena, W.Westmeier, M.Zamani

Neutron spectrometry with He-3 proportional counters

doi: 10.1088/1742-6596/366/1/012033
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