NSR Query Results
Output year order : Descending NSR database version of April 11, 2024. Search: Author = F.Heim Found 11 matches. 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 ^{170}Yb(α, n), E=14.5 MeV; ^{172}Yb(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
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 ^{128}Te(p, p'γ), E=8.8 MeV; ^{130}Te(p, p'γ), E=10 MeV; measured Ep, Ip, Eγ, Iγ, pγ-coin. ^{128,130}Te; 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
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 ^{94}Mo via radiative proton capture NUCLEAR REACTIONS ^{93}Nb(p, γ)^{94}Mo, E=3.0, 3.5 MeV; ^{94}Mo(p, p')^{94}Mo, 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. ^{94}Mo; 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 ^{92}Mo, ^{94}Mo and ^{96}Mo. 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
2021HE16 Phys.Rev. C 103, 054613 (2021) F.Heim, M.Muller, S.Wilden, A.Zilges Absolute ^{96}Mo(p, n)^{96m+g}Tc cross sections and a new branching for the ^{96m}Tc decay NUCLEAR REACTIONS ^{96}Mo(p, n)^{96}Tc/^{96m}Tc, E=3.9-5.4 MeV; measured Eγ, Iγ; deduced production σ(E) for ^{96}Tc g.s. and ^{96m}Tc, total σ(E) using activation method, branching ratio for ^{96m}Tc decay to ^{96}Tc g.s. Comparison with previous experimental results, and with statistical model calculations using Hauser-Feshbach TALYS code v1.95. RADIOACTIVITY ^{96m}Tc(EC)[from ^{96}Mo(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
2021HE17 Phys.Rev. C 103, 055803 (2021) F.Heim, J.Mayer, M.Muller, P.Scholz, A.Zilges Investigating the ^{109}Ag(p, γ)^{110}Cd reaction and its underlying nuclear physics NUCLEAR REACTIONS ^{109}Ag(p, γ)^{110}Cd, 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
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 ^{108}Cd via radiative proton capture NUCLEAR REACTIONS ^{107}Ag(p, γ)^{108}Cd, 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. ^{108}Cd; 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
2020HE09 Phys.Rev. C 101, 035807 (2020) F.Heim, P.Scholz, J.Mayer, M.Muller, A.Zilges Constraining nuclear properties in ^{94}Mo via a ^{93}Nb(p, γ)^{94}Mo total cross section measurement NUCLEAR REACTIONS ^{93}Nb(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. ^{94}Mo; deduced levels, J, π, nuclear level density (NLD), E1, M1 and E1+M1 g-strength functions (γ-SF), partial and total σ(E). ^{94}Mo(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
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 ^{63,65}Cu(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. ^{64,66}Zn; 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
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 ^{144}Sm(α, γ)^{148}Gd reaction rate for the γ process NUCLEAR REACTIONS ^{144}Sm(α, γ)^{148}Gd, E=10.66-12.66 MeV; measured Eα, Iα from α decay of ^{148}Gd at , σ(E) using activation method by irradiating the ^{144}Sm 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
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 ^{92}Mo(p, pγ), E=10.5 MeV; ^{119}Sn(d, pγ), E=10 MeV; ^{60}Ni(p, pγ), E=15 MeV; ^{94}Mo(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
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 ^{108}Cd NUCLEAR REACTIONS ^{108}Cd(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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