{
  "id": "1509.07628",
  "version": "v1",
  "published": "2015-09-25T08:31:18.000Z",
  "updated": "2015-09-25T08:31:18.000Z",
  "title": "Nucleosynthesis in the Ejecta of Neutron Star Mergers",
  "authors": [
    "Dirk Martin",
    "Albino Perego",
    "Almudena Arcones",
    "Oleg Korobkin",
    "Friedrich-Karl Thielemann"
  ],
  "comment": "6 pages, 4 figures, accepted for publication on PoS",
  "categories": [
    "astro-ph.SR",
    "astro-ph.HE",
    "nucl-th"
  ],
  "abstract": "Heavy elements like gold, platinum or uranium are produced in the r-process, which needs neutron-rich and explosive environments. Neutron star mergers are a promising candidate for an r-process site. They exhibit three different channels for matter ejection fulfilling these conditions: dynamic ejecta due to tidal torques, neutrino-driven winds and evaporating matter from the accretion disk. We present a first study of the integrated nucleosynthesis for a neutrino-driven wind from a neutron star merger with a hyper-massive neutron star. Trajectories from a recent hydrodynamical simulation are divided into four different angle regions and post-processed with a reaction network. We find that the electron fraction varies around $Y_e \\approx 0.1 - 0.4$, but its distribution differs for every angle of ejection. Hence, the wind ejecta do not undergo a robust r-process, but rather possess distinct nucleosynthesis yields depending on the angle range. Compared to the dynamic ejecta, a smaller amount of neutron-rich matter gets unbound, but the production of lighter heavy elements with $A \\lesssim 130$ in the neutrino-driven wind can complement the strong r-process of the dynamic ejecta.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-09-25T08:31:18.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "neutron star merger",
      "neutrino-driven wind",
      "dynamic ejecta",
      "possess distinct nucleosynthesis yields",
      "electron fraction varies"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2015arXiv150907628M",
      "inspire": 1394836
    }
  }
}