NSR Query Results
Output year order : Descending NSR database version of April 26, 2024. Search: Author = A.Karakas Found 20 matches. 2023MA18 Phys.Rev. C 107, 035806 (2023) C.Marshall, K.Setoodehnia, G.C.Cinquegrana, J.H.Kelly, F.Portillo Chaves, A.Karakas, R.Longland New constraints on sodium production in globular clusters from the 23Na(3He, d)24Mg reaction NUCLEAR REACTIONS 23Na(3He, d)24Mg, 23Na(3He, 3He), E=21 MeV; measured reaction products, angular distribution; deduced yields, resonances, resonance widths. 24Mg; deduced levels, spectroscopic factors, proton decay partial width for excited states. 23Na(p, γ), (p, α), T=0.01-0.5 GK; calculated reaction rate using data obtained in current work on the excited states of 24Mg. Bayesian method combined with the distorted wave Born approximation to assign statistically meaningful uncertainties to deduced values. Relevance to NeNa cycle and star-to-star anticorrelation of sodium and oxygen. Split-pole spectrograph (SPS) at 10 MV TUNL FN tandem accelerator.
doi: 10.1103/PhysRevC.107.035806
2023WA05 Phys.Rev.Lett. 130, 092701 (2023) L.H.Wang, J.Su, Y.P.Shen, J.J.He, M.Lugaro, B.Szanyi, A.I.Karakas, L.Y.Zhang, X.Y.Li, B.Guo, G.Lian, Z.H.Li, Y.B.Wang, L.H.Chen, B.Q.Cui, X.D.Tang, B.S.Gao, Q.Wu, L.T.Sun, S.Wang, Y.D.Sheng, Y.J.Chen, H.Zhang, Z.M.Li, L.Y.Song, X.Z.Jiang, W.Nan, W.K.Nan, L.Zhang, F.Q.Cao, T.Y.Jiao, L.H.Ru, J.P.Cheng, M.Wiescher, W.P.Liu Measurement of the 18O(α, γ)22Ne Reaction Rate at JUNA and Its Impact on Probing the Origin of SiC Grains NUCLEAR REACTIONS 18O(α, γ), E=470-787 keV; measured reaction products, Eγ, Iγ; deduced thick target yields, resonance energies and resonance strengths, total reaction rates. Comparison with available data. The Jinping Underground Nuclear Astrophysics experimental facility (JUNA).
doi: 10.1103/PhysRevLett.130.092701
2021ZH32 Astrophys.J. 913, 51 (2021) L.Y.Zhang, A.Y.Lopez, M.Lugaro, J.J.He, A.I.Karakas Thermonuclear 19F(p, α)16O Reaction Rate Revised and Astrophysical Implications NUCLEAR REACTIONS 19F(p, α), E=0.08-800 keV; calculated reaction rate using a Monte Carlo technique. Comparison with available data.
doi: 10.3847/1538-4357/abef63
2020KO36 Astrophys.J. 900, 179 (2020) C.Kobayashi, A.I.Karakas, M.Lugaro The Origin of Elements from Carbon to Uranium COMPILATION Z=6-92; analyzed available data; deduced isotopic and elemental abundances and stellar nucleosynthesis processes.
doi: 10.3847/1538-4357/abae65
2018GU08 Astrophys.J. 862, 174 (2018) M.Gull, A.Frebel, M.G.Cain, V.M.Placco, A.P.Ji, C.Abate, R.Ezzeddine, A.I.Karakas, T.T.Hansen, C.Sakari, E.M.Holmbeck, R.M.Santucci, A.R.Casey, T.C.Beers The R-Process Alliance: Discovery of the First Metal-poor Star with a Combined r- and s-process Element Signature ATOMIC PHYSICS C, N, O, Na, Mg, Al, Si, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Sr, Y, Zr, Ru, Rh, Pd, I, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Lu, Hf, Os, Ir, Pb, Th; analyzed measured atomic frequencies; deduced elemental abundances with their uncertainties.
doi: 10.3847/1538-4357/aacbc3
2017WA07 Astrophys.J. 836, 126 (2017) G.J.Wasserburg, A.I.Karakas, M.Lugaro Intermediate-mass Asymptotic Giant Branch Stars and Sources of 26Al, 60Fe, 107Pd, and 182Hf in the Solar System
doi: 10.3847/1538-4357/836/1/126
2017WA27 Phys.Rev. C 96, 025808 (2017) A.Wallner, K.Buczak, T.Belgya, M.Bichler, L.Coquard, I.Dillmann, R.Golser, F.Kappeler, A.Karakas, W.Kutschera, C.Lederer, A.Mengoni, M.Pignatari, A.Priller, R.Reifarth, P.Steier, L.Szentmiklosi Precise measurement of the thermal and stellar 54Fe (n, γ) cross sections via accelerator mass spectrometry NUCLEAR REACTIONS 54Fe(n, γ), E=cold to 100 keV; measured 55Fe concentration using accelerator mass spectrometry (AMS) technique at the Vienna Environmental Research Accelerator (VERA) laboratory; deduced σ(E), Maxwellian-averaged cross sections (MACS) between 5-100 keV, 55Fe/56Fe ratios. Comparison with previous measurements, and with evaluated data libraries ENDF/B-VII.1, JENDL-4.0, and JEFF-3.2. Impact of the improved cross sections for neutron capture nucleosynthesis for the AGB stars.
doi: 10.1103/PhysRevC.96.025808
2017YA27 Astrophys.J. 848, 98 (2017) S.Q.Yan, Z.H.Li, Y.B.Wang, K.Nishio, M.Lugaro, A.I.Karakas, H.Makii, P.Mohr, J.Su, Y.J.Li, I.Nishinaka, K.Hirose, Y.L.Han, R.Orlandi, Y.P.Shen, B.Guo, S.Zeng, G.Lian, Y.S.Chen, W.P.Liu The 95Zr(n, γ)96Zr Cross Section from the Surrogate Ratio Method and Its Effect on s-process Nucleosynthesis NUCLEAR REACTIONS 94,90Zr(18O, 16O), E=117 MeV; measured reaction products; deduced σ for surrogate reactions. Comparison with KADONIS and ENDF/B-VII.1 evaluated nuclear library and TALYS nuclear code calculations.
doi: 10.3847/1538-4357/aa8c74
2016WA11 Phys.Rev. C 93, 045803 (2016) A.Wallner, M.Bichler, K.Buczak, I.Dillmann, F.Kappeler, A.Karakas, C.Lederer, M.Lugaro, K.Mair, A.Mengoni, G.Schatzel, P.Steier, H.P.Trautvetter Accelerator mass spectrometry measurements of the 13C(n, γ)14C and 14N(n, p)14C cross sections NUCLEAR REACTIONS 13C(n, γ), 14N(n, p), E=123, 182 keV, and at kT=25 keV neutrons from TRIGA reactor of Atominstitut-Vienna and from Van de Graaff accelerator of Karlsruhe Institute of Technology; measured σ(E) and Maxwellian averaged σ(kT=5-100 keV) using accelerator mass spectrometry (AMS) technique at Vienna Environmental Research Accelerator (VERA) facility. Comparison with previous experimental σ(E), KADONIS compiled data, and JEFF-3.2 evaluated library. Impact of the new stellar cross sections on the s process in low-mass AGB stars using stellar models.
doi: 10.1103/PhysRevC.93.045803
2014PA46 Phys.Rev. C 90, 038801 (2014) A.Parikh, J.Jose, A.Karakas, C.Ruiz, K.Wimmer Strength of the ER = 127 keV, 26Al(p, γ)27Si resonance NUCLEAR REACTIONS 26Al(p, γ)27Si, E=127 keV; analyzed thermonuclear reaction rates using different assumed strengths for 127-keV proton resonance and representative stellar model calculations; deduced 26Al production yield in classical nova explosions and asymptotic giant branch (AGB) stars. Recommended new spectroscopic measurement of 26Al(3He, d)27Si reaction to confirm strength of the 127-keV resonance.
doi: 10.1103/PhysRevC.90.038801
2012GU18 Astrophys.J. 756, 193 (2012) B.Guo, Z.H.Li, M.Lugaro, J.Buntain, D.Y.Pang, Y.J.Li, J.Su, S.Q.Yan, X.X.Bai, Y.S.Chen, Q.W.Fan, S.J.Jin, A.I.Karakas, E.T.Li, Z.C.Li, G.Lian, J.C.Liu, X.Liu, J.R.Shi, N.C.Shu, B.X.Wang, Y.B.Wang, S.Zeng, W.P.Liu New Determination of the 13C(α, n)16O Reaction Rate and its Influence on the s-process Nucleosynthesis in AGB Stars NUCLEAR REACTIONS 12,13C(11B, 7Li), E=50 MeV; measured reaction products; deduced σ(θ), S-factors, stellar rates. Comparison with available data.
doi: 10.1088/0004-637X/756/2/193
2012KA14 Astrophys.J. 751, 8 (2012) A.I.Karakas, D.A.Garcia-Hernandez, M.Lugaro Heavy Element Nucleosynthesis in the Brightest Galactic Asymptotic Giant Branch Stars NUCLEAR REACTIONS 22Ne(α, n), E not given; calculated yields, elemental abundances, stellar nucleosynthesis. Comparison with NACRE compilation.
doi: 10.1088/0004-637X/751/1/8
2012LO07 Phys.Rev. C 85, 065809 (2012) R.Longland, C.Iliadis, A.I.Karakas Reaction rates for the s-process neutron source 22Ne + α NUCLEAR REACTIONS 22Ne(α, n)25Mg, 22Ne(α, γ)26Mg, E=830-2040 keV; analyzed resonance strengths, resonance energies, spectroscopic factors, partial widths; deduced astrophysical reactions rates, reaction rate probability densities, nucleosynthesis uncertainties; calculated element abundances. Monte Carlo sampling. Relevance to s-process nucleosynthesis in massive and AGB stars.
doi: 10.1103/PhysRevC.85.065809
2012LU04 Astrophys.J. 747, 2 (2012) M.Lugaro, A.I.Karakas, R.J.Stancliffe, C.Rijs The s-process in Asymptotic Giant Branch Stars of Low Metallicity and the Composition of Carbon-enhanced Metal-poor Stars
doi: 10.1088/0004-637X/747/1/2
2006KA25 Astrophys.J. 643, 471 (2006) A.I.Karakas, M.A.Lugaro, M M.Wiescher, J.Gorres, C.Ugalde The uncertainties in the 22Ne-α-capture reaction rates and the production of the heavy magnesium isotopes in asymptotic giant branch stars of intermediate mass NUCLEAR REACTIONS 22Ne(α, n), (α, γ), E=low; calculated astrophysical reaction rates, resonance parameters, related features. Implications for stellar nucleosynthesis discussed.
doi: 10.1086/502793
2005CA40 Nucl.Phys. A758, 272c (2005) S.W.Campbell, Y.Fenner, A.I.Karakas, J.C.Lattanzio, B.K.Gibson Abundance Anomalies in NGC6752 - Do AGB Stars Have a Role?
doi: 10.1016/j.nuclphysa.2005.05.046
2005KA36 Nucl.Phys. A758, 489c (2005) The uncertainties in the 22Ne + α-capture reactions and magnesium production in intermediate-mass AGB stars NUCLEAR REACTIONS 22Ne(α, n), (α, γ), 25Mg(n, p), (n, γ), E=low; analyzed astrophysical reaction rates.
doi: 10.1016/j.nuclphysa.2005.05.090
2005LU17 Nucl.Phys. A758, 725c (2005) M.Lugaro, O.Pols, A.I.Karakas, C.A.Tout HR4049: signature of nova nucleosynthesis?
doi: 10.1016/j.nuclphysa.2005.05.130
2005RE20 Nucl.Phys. A758, 324c (2005) A.Renda, Y.Fenner, B.K.Gibson, A.I.Karakas, J.C.Lattanzio, S.Campbell, A.Chieffi, K.Cunha, V.V.Smith The Evolution of Fluorine in Galactic Systems
doi: 10.1016/j.nuclphysa.2005.05.058
2005ST27 Nucl.Phys. A758, 569c (2005) R.J.Stancliffe, M.Lugaro, A.I.Karakas, C.A.Tout Nucleosynthesis on the Asymptotic Giant Branch: A comparison between codes
doi: 10.1016/j.nuclphysa.2005.05.105
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