Improved predictions of nuclear reaction rates with the TALYS reaction code for astrophysical applications

By S. Goriely, Stéphane Hilaire, A. Koning. 2008

191 citations recorded by the source corpus.

Nuclear reaction rates of astrophysical applications are traditionally determined on the basis of Hauser-Feshbach reaction codes. These codes adopt a number of approximations that have never been tested, such as a simplified width fluctuation correction, the neglect of delayed or multiple-particle emission during the electromagnetic decay cascade, or the absence of the pre-equilibrium contribution at increasing incident energies. The reaction code TALYS has been recently updated to estimate the Maxwellian-averaged reaction rates that are of astrophysical relevance. These new developments enable the reaction rates to be calculated with increased accuracy and reliability and the approximations of previous codes to be investigated. The TALYS predictions for the thermonuclear rates of relevance to astrophysics are detailed and compared with those derived by widely-used codes for the same nuclear ingredients. It is shown that TALYS predictions may differ significantly from those of previous codes, in particular for nuclei for which no or little nuclear data is available. The pre-equilibrium process is shown to influence the astrophysics rates of exotic neutron-rich nuclei significantly. For the first time, the Maxwellian-averaged (n,2n) reaction rate is calculated for all nuclei and its competition with the radiative capture rate is discussed. The TALYS code provides a new tool to estimate all nuclear reaction rates of relevance to astrophysics with improved accuracy and reliability.

Subfields: Aerospace Engineering, Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/28eec2029eafb0139639e3b89227c0ff7bd14865

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Citations in the corpus

CRPropa 3—a public astrophysical simulation framework for propagating extraterrestrial ultra-high energy particles (2016, unknown): “0 [39]; see ref.”
The impact of individual nuclear properties on $r$-process nucleosynthesis (2015, methodology): “ 100 120 Neutron Number (N) 100 50 0 50 100 % Difference Nonsmoker Talys Cigar Figure 8: Comparison of Maxwellian averaged cross sections from various statistical model codes, Non-smoker [188], TALYS [189] and CIGAR [190], at T 9 = 1:0 to the KADoNiS database [191]. [185]). Presently all capture rat”
Comprehensive nucleosynthesis analysis for ejecta of compact binary mergers (2014, methodology): “Experimentally unknown reactions are estimated with the TALYS code (Koning, Hilaire & Duijvestijn 2005; Goriely et al. 2008) on the basis of the Skyrme Hartree–Fock–Bogolyubov (HFB) nuclear mass model, HFB-21 (Goriely et al. 2010).”
STANDARD BIG BANG NUCLEOSYNTHESIS UP TO CNO WITH AN IMPROVED EXTENDED NUCLEAR NETWORK (2011, methodology): “The latter library is based on the Hauser–Feshbach calculation with the TALYS reaction code (Goriely et al. 2008) and though, a priori, the reaction model is not well suited for the description of the reaction mechanism on such light species, it appears to provide rather fair rates that can be used…”
STARLIB: A NEXT-GENERATION REACTION-RATE LIBRARY FOR NUCLEAR ASTROPHYSICS (2011, methodology): “For temperatures T > 5 GK, the rate was extrapolated with the BRUSLIB Hauser–Feshbach rates (Goriely et al. 2008a).”
r-PROCESS NUCLEOSYNTHESIS IN DYNAMICALLY EJECTED MATTER OF NEUTRON STAR MERGERS (2011, methodology): “Experimentally unknown reactions are estimated with the TALYS code (Goriely et al. 2008) on the basis of the HFB21 nuclear mass model (Goriely et al. 2010).”
Precision big bang nucleosynthesis with improved Helium-4 predictions (2018, methodology): “Since very few or no experimental data are available for these reactions, the actual rates may differ by a few orders of magnitudes, from the TALYS (Goriely et al., 2008) theoretical predictions.”
PRODUCTION OF ALL THE r-PROCESS NUCLIDES IN THE DYNAMICAL EJECTA OF NEUTRON STAR MERGERS (2014, background): “…from the latest versions of REACLIB7 (Cyburt et al. 2010) and Nuclear Wallet Cards.8 Otherwise, the theoretical estimates of fusion rates9 (TALYS; Goriely et al. 2008) and β-decay half-lives (GT2; Tachibana et al. 1990) are adopted, where both are based on the same nuclear masses (HFB-21;…”