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NSR database version of April 11, 2024.

Search: Author = A.Karakas

Found 20 matches.

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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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
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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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset23047.

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
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset32770.

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
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset23295.

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetS0072.

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
Citations: PlumX Metrics

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
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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
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2005KA36      Nucl.Phys. A758, 489c (2005)

A.Karakas, M.Lugaro

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
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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
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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
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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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Note: The following list of authors and aliases matches the search parameter A.Karakas: , A.I.KARAKAS