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NSR database version of April 27, 2024.

Search: Author = F.Heim

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2023MU07      Phys.Rev. C 107, 035804 (2023)

M.Muller, F.Heim, Y.Wang, S.Wilden, A.Zilges

Determination of ^{170, 172}Yb(α, n)^{173, 175}Hf reaction cross sections in a stacked-target experiment

NUCLEAR REACTIONS ¹⁷⁰Yb(α, n), E=14.5 MeV; ¹⁷²Yb(α, n), E=17 MeV; measured Eγ, Iγ; deduced σ(E). Activation technique. Comparison with TALYS-1.95 calculations with various α optical model potentials (OMP) and other experimental data. Investigated the evolution of the α-OMP with the neutron-to-proton ratio. Cologne Clover Counting setup consisting of two clover-type high-purity germanium detectors in a face-to-face geometry. Irradiation of stacked targets at10 MV FN tandem accelerator (University of Cologne).

doi: 10.1103/PhysRevC.107.035804
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2022PR02      Phys.Rev. C 105, 034319 (2022)

S.Prill, A.Bohn, V.Everwyn, G.Hafner, F.Heim, M.Spieker, M.Weinert, J.Wilhelmy, A.Zilges

Lifetime analysis of ^{128, 130}Te via the Doppler-shift attenuation method

NUCLEAR REACTIONS ¹²⁸Te(p, p'γ), E=8.8 MeV; ¹³⁰Te(p, p'γ), E=10 MeV; measured Ep, Ip, Eγ, Iγ, pγ-coin. ^128,130Te; deduced levels, J, π, T_1/2 of excited states, B(E2), B(M1). p-γ-coincidence DSA technique for half-life determination. Comparison to shell-model calculations performed with NuShellX in the jj55pn model space. Combined SONIC (Si-detectors) and HORUS (HPGe-detectors) arrays.

doi: 10.1103/PhysRevC.105.034319
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Data from this article have been entered in the XUNDL database. For more information, click here.

2021HE07      Phys.Rev. C 103, 025805 (2021)

F.Heim, J.Mayer, M.Muller, P.Scholz, A.Zilges

Deducing primary γ-ray intensities and the dipole strength function in ⁹⁴Mo via radiative proton capture

NUCLEAR REACTIONS ⁹³Nb(p, γ)⁹⁴Mo, E=3.0, 3.5 MeV; ⁹⁴Mo(p, p')⁹⁴Mo, E=13.5 MeV; measured Eγ, Iγ, pγ- and γγ-coin using HORUS γ-ray spectrometer for γ detection and SONIC array for scattered protons at the FN-Tandem accelerator of University of Cologne. ⁹⁴Mo; deduced levels, J, π, γ-branching ratios, primary γ rays from two-step cascade (TSC) spectra, partial cross-sections at E(p)=3.0 and 3.5 MeV, E1 and M1 strength functions, absolute γ-strength function (γSF). Systematics of γ strength functions in ⁹²Mo, ⁹⁴Mo and ⁹⁶Mo. Comparison of γ strength functions with experimental results using the Oslo method and photoinduced experiments as well as with recent theoretical quasiparticle random-phase approximation (QRPA) calculations. Relevance to nucleosynthesis of heavy nuclei in the slow and rapid neutron capture processes.

doi: 10.1103/PhysRevC.103.025805
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO2539. Data from this article have been entered in the XUNDL database. For more information, click here.

2021HE16      Phys.Rev. C 103, 054613 (2021)

F.Heim, M.Muller, S.Wilden, A.Zilges

Absolute ⁹⁶Mo(p, n)^96m+gTc cross sections and a new branching for the ^96mTc decay

NUCLEAR REACTIONS ⁹⁶Mo(p, n)⁹⁶Tc/^96mTc, E=3.9-5.4 MeV; measured Eγ, Iγ; deduced production σ(E) for ⁹⁶Tc g.s. and ^96mTc, total σ(E) using activation method, branching ratio for ^96mTc decay to ⁹⁶Tc g.s. Comparison with previous experimental results, and with statistical model calculations using Hauser-Feshbach TALYS code v1.95.

RADIOACTIVITY ^96mTc(EC)[from ⁹⁶Mo(p, n), E=3.9-5.4 MeV]; measured Eγ, Iγ, branching ratio for the ϵ decay mode. Comparison with literature data.

doi: 10.1103/PhysRevC.103.054613
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO2542. Data from this article have been entered in the XUNDL database. For more information, click here.

2021HE17      Phys.Rev. C 103, 055803 (2021)

F.Heim, J.Mayer, M.Muller, P.Scholz, A.Zilges

Investigating the ¹⁰⁹Ag(p, γ)¹¹⁰Cd reaction and its underlying nuclear physics

NUCLEAR REACTIONS ¹⁰⁹Ag(p, γ)¹¹⁰Cd, E=2.5-5.0 MeV from the FN-Tandem accelerator of the University of Cologne; measured Eγ, Iγ, γ(θ) using HORUS array of 14 HPGe detectors; deduced total σ(E). Comparison with previous experimental results and Hauser-Feshbach calculations. ^{106,108,110,112}Cd; analyzed dipole components of the γ-ray strength functions and nuclear level density (NLD) using D1M+QRPA+0lim γ-SF model and microscopic NLD model.

doi: 10.1103/PhysRevC.103.055803
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO2543. Data from this article have been entered in the XUNDL database. For more information, click here.

2020HE08      Phys.Rev. C 101, 035805 (2020)

F.Heim, P.Scholz, M.Korschgen, J.Mayer, M.Muller, A.Zilges

Insights into the statistical γ-decay behavior of ¹⁰⁸Cd via radiative proton capture

NUCLEAR REACTIONS ¹⁰⁷Ag(p, γ)¹⁰⁸Cd, E=2.0, 2.7, 3.5, 4, 4.5, 5.0 MeV; measured Eγ, Iγ, γγ-coin, γ(θ) using the HORUS spectrometer at the Institute for Nuclear Physics, Cologne. ¹⁰⁸Cd; deduced levels, resonances, J, π, partial and total σ(E) in the astrophysical energy region, E1 γ-strength function (γ-SF), total γ-decay width, nuclear level density (NLD). Comparison with previous experimental data, and with statistical model calculations based on Gogny D1M HFB+QRPA interaction. Relevance to mechanism of the p process.

doi: 10.1103/PhysRevC.101.035805
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2020HE09      Phys.Rev. C 101, 035807 (2020)

F.Heim, P.Scholz, J.Mayer, M.Muller, A.Zilges

Constraining nuclear properties in ⁹⁴Mo via a ⁹³Nb(p, γ)⁹⁴Mo total cross section measurement

NUCLEAR REACTIONS ⁹³Nb(p, γ), E=1.96-4.98 MeV; measured Eγ, Iγ, γγ-coin, γ(θ) using the HORUS spectrometer at the Institute for Nuclear Physics, Cologne. ⁹⁴Mo; deduced levels, J, π, nuclear level density (NLD), E1, M1 and E1+M1 g-strength functions (γ-SF), partial and total σ(E). ⁹⁴Mo(γ, p), (γ, n), T=2.0-3.5 GK; deduced reaction rates, and compared with data in REACLIB and STARLIB libraries. Comparison with previous experimental data, and with statistical model calculations based on Gogny D1M HFB+QRPA interaction. Relevance to mechanism of the p process.

doi: 10.1103/PhysRevC.101.035807
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO2516. Data from this article have been entered in the XUNDL database. For more information, click here.

2020SC04      Phys.Rev. C 101, 045806 (2020)

P.Scholz, M.Guttormsen, F.Heim, A.C.Larsen, J.Mayer, D.Savran, M.Spieker, G.M.Tveten, A.V.Voinov, J.Wilhelmy, F.Zeiser, A.Zilges

Primary γ-ray intensities and γ-strength functions from discrete two-step γ-ray cascades in radiative proton-capture experiments

NUCLEAR REACTIONS ^63,65Cu(p, γ), E=2.0, 3.5 MeV; measured Eγ, Iγ, γγ-coin, primary γ rays, two-step γ-ray cascades (TSCs) using the HORUS array of 14 HPGe detectors at the Institute for Nuclear Physics, University of Cologne. ^64,66Zn; deduced levels, J, π, primary γ-ray intensities, dipole strength functions, and absolute γ-ray strength functions. Comparison with theoretical predictions, generalized Brink-Axel hypothesis, and other experimental results. Relevance of reaction rates of radiative capture reactions to nucleosynthesis of heavy nuclei in explosive stellar environments.

doi: 10.1103/PhysRevC.101.045806
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Data from this article have been entered in the XUNDL database. For more information, click here.

2020SC12      Phys.Rev. C 102, 045811 (2020)

P.Scholz, H.Wilsenach, H.W.Becker, A.Blazhev, F.Heim, V.Foteinou, U.Giesen, C.Munker, D.Rogalla, P.Sprung, A.Zilges, K.Zuber

New measurement of the ¹⁴⁴Sm(α, γ)¹⁴⁸Gd reaction rate for the γ process

NUCLEAR REACTIONS ¹⁴⁴Sm(α, γ)¹⁴⁸Gd, E=10.66-12.66 MeV; measured Eα, Iα from α decay of ¹⁴⁸Gd at , σ(E) using activation method by irradiating the ¹⁴⁴Sm targets at the cyclotron of PTB-Braunschweig, and α counting at TU-Dresden; deduced astrophysical reaction rates from 1.5-4.5 GK. Comparison with earlier experimental results, and with statistical-model using the TALYS code and the latest parametrizations of α+ nucleus optical model potentials (OMPs). Reaction rates compared with data in Reaclib database.

doi: 10.1103/PhysRevC.102.045811
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2017PI13      Nucl.Instrum.Methods Phys.Res. A875, 104 (2017)

S.G.Pickstone, M.Weinert, M.Farber, F.Heim, E.Hoemann, J.Mayer, M.Muscher, S.Prill, P.Scholz, M.Spieker, V.Vielmetter, Ju.Wilhelmy, A.Zilges

Combining α-ray and particle spectroscopy with SONICatHORUS

NUCLEAR REACTIONS ⁹²Mo(p, pγ), E=10.5 MeV; ¹¹⁹Sn(d, pγ), E=10 MeV; ⁶⁰Ni(p, pγ), E=15 MeV; ⁹⁴Mo(p, pγ), E=13.5 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, branching ratios.

doi: 10.1016/j.nima.2017.09.016
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Data from this article have been entered in the XUNDL database. For more information, click here.

2016SC12      Phys.Lett. B 761, 247 (2016)

P.Scholz, F.Heim, J.Mayer, C.Munker, L.Netterdon, F.Wombacher, A.Zilges

Constraints on the α + nucleus optical-model potential via α-induced reaction studies on ¹⁰⁸Cd

NUCLEAR REACTIONS ¹⁰⁸Cd(α, γ), (α, n), E=12-13.5 MeV; measured reaction products, Eγ, Iγ; deduced σ, optical model potential parameters.

doi: 10.1016/j.physletb.2016.08.040
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetO2318.