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NSR database version of April 27, 2024.

Search: Author = O.Clarkson

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2021DE13      Phys.Rev. C 103, 055815 (2021)

R.J.deBoer, O.Clarkson, A.J.Couture, J.Gorres, F.Herwig, I.Lombardo, P.Scholz, M.Wiescher

¹⁹F(p, γ)²⁰Ne and ¹⁹F(p, αγ)¹⁶O reaction rates and their effect on calcium production in Population III stars from hot CNO breakout

NUCLEAR REACTIONS ¹⁹F(p, αγ)¹⁶O, E(cm)<865 keV; ¹⁹F(p, p), E(cm)=0.5-0.9 MeV; analyzed and evaluated available experimental data for σ(E, θ), differential S factors, angular distributions, R-matrix fit to secondary γ-ray data, secondary on-resonance γ-ray angular distributions. ¹⁶O; deduced levels, resonance energies, J, π, Γ_p, Γ_α, Γ_γ. ¹⁹F(p, γ)²⁰Ne, E(cm)<0.8 MeV; analyzed and evaluated experimental data for S factor. ²⁰Ne; deduced levels, resonance energies, J, π, resonance strengths, Γ_p, Γ_γ, Γ_α, Γ_total. ¹⁹F(p, γ)²⁰Ne, ¹⁹F(p, αγ)¹⁶O, T=0.01-1 GK; recommended astrophysical reaction rates, and compared with compilation in NACRE database. Phenomenological R-matrix approach. Discussed astrophysical impact of the evaluated data, and recommended further measurements of importance, for example proton transfer studies needed to determine the proton ANCs of proton bound states. Relevance to the presence of Ca in Fe-poor stars in hot CNO breakout H-burning nucleosynthesis.

doi: 10.1103/PhysRevC.103.055815
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2021WI02      Eur.Phys.J. A 57, 24 (2021)

M.Wiescher, O.Clarkson, R.J.deBoer, P.Denisenkov

Nuclear clusters as the first stepping stones for the chemical evolution of the universe

NUCLEAR REACTIONS ^6,7Li(α, γ), E(cm)<2.5 MeV; ¹⁰B(α, n), (α, d), E(cm)<1.2 MeV; analyzed available data; deduced σ, σ(θ), reaction rates.

doi: 10.1140/epja/s10050-020-00339-x
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