The Nuclear Reaction Network WinNet

M. Reichert, C. Winteler, O. Korobkin, A. Arcones, J. Bliss, M. Eichler, U. Frischknecht, C. Fröhlich, R. Hirschi, M. Jacobi, J. Kuske, G. Martínez-Pinedo, D. Martin, D. Mocelj, T. Rauscher, F.-K. Thielemann

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We present the state-of-the-art single-zone nuclear reaction network WinNet, which is capable of calculating the nucleosynthetic yields of a large variety of astrophysical environments and conditions. This ranges from the calculation of the primordial nucleosynthesis, where only a few nuclei are considered, to the ejecta of neutron star mergers with several thousands of involved nuclei. Here we describe the underlying physics and implementation details of the reaction network. We additionally present the numerical implementation of two different integration methods, the implicit Euler method and Gears method, along with their advantages and disadvantages. We furthermore describe basic example cases of thermodynamic conditions that we provide together with the network and demonstrate the reliability of the code by using simple test cases. With this publication, WinNet will be publicly available and open source at GitHub and Zenodo.
Original languageEnglish
Article number66
Pages (from-to)1-28
Number of pages28
JournalAstrophysical Journal, Supplement Series
Issue number2
Publication statusPublished - 11 Oct 2023


  • Nuclear astrophysics
  • Nuclear reaction cross sections
  • Computational methods
  • Nucleosynthesis


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