NSR Query Results
Output year order : Descending NSR database version of April 27, 2024. Search: Author = L.Downen Found 6 matches. 2023CO08 Nucl.Instrum.Methods Phys.Res. A1056, 168654 (2023) A.L.Cooper, S.Hunt, L.Downen, K.Setoodehnia, F.Portillo, C.Marshall, T.B.Clegg, A.E.Champagne, R.Longland Correlated characterization of 20Ne-implanted targets using nuclear reaction analysis, Rutherford backscattering spectrometry, and ion transport modeling NUCLEAR REACTIONS 20Ne(p, γ), E=1169 keV; 20Ne(α, α), E=2 MeV; measured reaction products, Eγ, Iγ; deduced resonance parameters, yields. The model FN tandem Van de Graaff accelerator at TUNL.
doi: 10.1016/j.nima.2023.168654
2023CO09 Nucl.Instrum.Methods Phys.Res. A1056, 168648 (2023) A.L.Cooper, S.Hunt, L.Downen, K.Setoodehnia, F.Portillo, C.Marshall, T.B.Clegg, A.E.Champagne, R.Longland 252Cf yield calibration method for nuclear material accountancy and safeguards practitioners RADIOACTIVITY 252Cf(SF); measured decay products, En, In; deduced neutron yields using passive neutron correlation counting (PNCC). The neutron source used in this evaluation was previously certified by the National Institutes of Science and Technology (NIST), which provides a reference for the accuracy of the PNCC method.
doi: 10.1016/j.nima.2023.168648
2022DO04 Phys.Rev. C 105, 055804 (2022) L.N.Downen, C.Iliadis, A.E.Champagne, T.B.Clegg, A.Coc, J.Dermigny Thermonuclear reaction rate of 29Si(p, γ)30P NUCLEAR REACTIONS 29Si(p, γ), E(cm)=200-420 keV; measured Eγ, Iγ, γγ-coin; deduced resonance energies, resonance strengths. 30P; deduced levels, J, π, branching ratios. 29Si(p, γ), T=0.01-5.0 GK; deduced total thermonuclear reaction rates. Investigated the influence of possibly unobserved resonances on the reaction rates. Comparison to other experimental data. HPGe detector surrounded by a 16-segment NaI(Tl) annulus comprising LENA γγ-coincidence spectrometer at TUNL.
doi: 10.1103/PhysRevC.105.055804
2019HU08 Phys.Rev. C 99, 045804 (2019) S.Hunt, C.Iliadis, A.Champagne, L.Downen, A.Cooper New measurement of the Elabα = 0.83 MeV resonance in 22Ne(α, γ)26Mg NUCLEAR REACTIONS 22Ne(α, γ)26Mg, E=815, 904 keV; 22Ne(p, γ)23Na, E=479 keV; measured Eγ, Iγ, γγ-coin using HPGe and NaI(Tl) detectors at the JN Van de Graaff accelerator of the Laboratory for Experimental Nuclear Astrophysics (LENA); deduced yield curves for 479-keV proton resonance in 23Na. 26Mg; deduced level, precise energy of the 830-keV resonance by γγ-coin method, resonance strength. Comparison with previous experimental results.
doi: 10.1103/PhysRevC.99.045804
2017KE01 Phys.Rev. C 95, 015806 (2017) K.J.Kelly, A.E.Champagne, L.N.Downen, J.R.Dermigny, S.Hunt, C.Iliadis, A.L.Cooper New measurements of low-energy resonances in the 22Ne (p, γ) 23Na reaction NUCLEAR REACTIONS 22Ne(p, γ), E=165, 192, 425, 441 keV; measured Eγ, Iγ, γγ-coin for resonances and direct capture process using HPGe-NaI detectors and plastic scintillator cosmic ray veto at LENA-TUNL facility. 23Na; deduced levels, resonance strengths, σγ for direct capture state, γ-ray branching ratios from singles and coincidence γ-ray data for resonant states, thermonuclear reaction rates.
doi: 10.1103/PhysRevC.95.015806
2015BU02 Phys.Rev. C 91, 015812 (2015) M.Q.Buckner, C.Iliadis, K.J.Kelly, L.N.Downen, A.E.Champagne, J.M.Cesaratto, C.Howard, R.Longland High-intensity-beam study of 17O(p, γ)18F and thermonuclear reaction rates for 17O + p NUCLEAR REACTIONS 17O(p, γ), E=170-530 keV; measured Eγ, Iγ, γγ-coin at LENA-TUNL facility. 18F; deduced levels, J, π, resonances, γ branching ratios from resonance capture, and from direct capture as function of E(p), resonance strengths, total S(E) factors. 17O(p, γ), (p, α); deduced thermonuclear reaction rates. Comparison with previous results.
doi: 10.1103/PhysRevC.91.015812
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