{
  "id": "1203.6488",
  "version": "v2",
  "published": "2012-03-29T11:20:41.000Z",
  "updated": "2012-10-16T10:30:13.000Z",
  "title": "Explosive Nucleosynthesis in Magnetohydrodynamical Jets from Collapsars II. Heavy-Element Nucleosynthesis of s, r, p-Processes",
  "authors": [
    "Masaomi Ono",
    "Masa-aki Hashimoto",
    "Shin-ichiro Fujimoto",
    "Kei Kotake",
    "Shoichi Yamada"
  ],
  "comment": "25 pages, 13 figures, 2 tables, accepted for publication in Progress of Theoretical Physics",
  "journal": "Prog. Theor. Phys. 128 (2012), 741-765",
  "doi": "10.1143/PTP.128.741",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We investigate the nucleosynthesis in a massive star of 70 M_solar with solar metallicity in the main sequence stage. The helium core mass after hydrogen burning corresponds to 32 M_solar. Nucleosynthesis calculations have been performed during the stellar evolution and the jetlike supernova explosion of a collapsar model, where the weak s-, p-, and r-processes are taken into account. We confirm that s-elements of 60 < A < 90 are highly overproduced relative to the solar abundances in the hydrostatic nucleosynthesis. During oxygen burning, p-elements of A > 90 are produced via photodisintegrations of seed s-elements. However, the produced p-elements are disintegrated in later stages except for ^{180}Ta. In the explosive nucleosynthesis, elements of 90 < A < 160 are significantly overproduced relative to the solar values owing to the r-process. Only heavy p-elements (N > 50) are overproduced via the p-process. Compared with the previous study of r-process nucleosynthesis calculations in the collapsar model of 40 M_solar by Fujimoto et al. 2007, 2008, our jet model cannot contribute to the third peak of the solar r-elements and intermediate p-elements. Averaging the overproduction factors over the progenitor masses with the use of Salpeter's IMF, we suggest that the 70 M_solar star could contribute to the solar weak s-elements of 60 < A < 90 and neutron-rich elements of 90 < A < 160. We confirm the primary synthesis of light p-elements in the ejected matter of high peak temperature. The ejected matter has [Sr/Eu] \\sim -0.4, which is different from that of a typical r-process-enriched star CS22892-052 ([Sr/Eu] \\sim -1). We find that Sr-Y-Zr isotopes are primarily synthesized in the explosive nucleosynthesis in a similar process of the primary production of light p-elements, which has been considered as one of the sites of a lighter element primary process (LEPP).",
  "revisions": [
    {
      "version": "v2",
      "updated": "2012-10-16T10:30:13.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "explosive nucleosynthesis",
      "heavy-element nucleosynthesis",
      "magnetohydrodynamical jets",
      "p-processes",
      "collapsar model"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "Progress of Theoretical Physics",
      "year": 2012,
      "month": "Oct",
      "volume": 128,
      "number": 4,
      "pages": 741
    },
    "note": {
      "typesetting": "TeX",
      "pages": 25,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1095342,
      "adsabs": "2012PThPh.128..741O"
    }
  }
}