{
  "id": "1211.6661",
  "version": "v1",
  "published": "2012-11-28T17:04:34.000Z",
  "updated": "2012-11-28T17:04:34.000Z",
  "title": "Impact of a revised $^{25}$Mg(p,$γ$)$^{26}$Al reaction rate on the operation of the Mg-Al cycle",
  "authors": [
    "O. Straniero",
    "G. Imbriani",
    "F. Strieder",
    "D. Bemmerer",
    "C. Broggini",
    "A. Caciolli",
    "P. Corvisiero",
    "H. Costantini",
    "S. Cristallo",
    "A. DiLeva",
    "A. Formicola",
    "Z. Elekes",
    "Zs. Fülöp",
    "G. Gervino",
    "A. Guglielmetti",
    "C. Gustavino",
    "Gy. Gyürky",
    "M. Junker",
    "A. Lemut",
    "B. Limata",
    "M. Marta",
    "C. Mazzocchi",
    "R. Menegazzo",
    "L. Piersanti",
    "P. Prati",
    "V. Roca",
    "C. Rolfs",
    "C. Rossi Alvarez",
    "E. Somorjai",
    "F. Terrasi",
    "H. P. Trautvetter"
  ],
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA",
    "astro-ph.HE",
    "nucl-ex"
  ],
  "abstract": "Proton captures on Mg isotopes play an important role in the Mg-Al cycle active in stellar H-burning regions. In particular, low-energy nuclear resonances in the $^{25}$Mg(p,$\\gamma$)$^{26}$Al reaction affect the production of radioactive $^{26}$Al$^{gs}$ as well as the resulting Mg/Al abundance ratio. Reliable estimations of these quantities require precise measurements of the strengths of low-energy resonances. Based on a new experimental study performed at LUNA, we provide revised rates of the $^{25}$Mg(p,$\\gamma$)$^{26}$Al$^{gs}$ and the $^{25}$Mg(p,$\\gamma$)$^{26}$Al$^{m}$ reactions with corresponding uncertainties. In the temperature range 50 to 150 MK, the new recommended rate of the $^{26}$Al$^{m}$ production is up to 5 times higher than previously assumed. In addition, at T$=100$ MK, the revised total reaction rate is a factor of 2 higher. Note that this is the range of temperature at which the Mg-Al cycle operates in an H-burning zone. The effects of this revision are discussed. Due to the significantly larger $^{25}$Mg(p,$\\gamma$)$^{26}$Al$^{m}$ rate, the estimated production of $^{26}$Al$^{gs}$ in H-burning regions is less efficient than previously obtained. As a result, the new rates should imply a smaller contribution from Wolf-Rayet stars to the galactic $^{26}$Al budget. Similarly, we show that the AGB extra-mixing scenario does not appear able to explain the most extreme values of $^{26}$Al/$^{27}$Al, i.e. $>10^{-2}$, found in some O-rich presolar grains. Finally, the substantial increase of the total reaction rate makes the hypothesis of a self-pollution by massive AGBs a more robust explanation for the Mg-Al anticorrelation observed in Globular-Cluster stars.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2012-11-28T17:04:34.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "low-energy nuclear resonances",
      "production",
      "resulting mg/al abundance ratio",
      "mg-al cycle operates",
      "mg isotopes play"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/763/2/100",
      "journal": "The Astrophysical Journal",
      "year": 2013,
      "month": "Feb",
      "volume": 763,
      "number": 2,
      "pages": 100
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1204574,
      "adsabs": "2013ApJ...763..100S"
    }
  }
}