Impact of a revised 25Mg(p, γ)26Al reaction rate on the operation of the Mg-Al cycle

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. S. Fülöp, G. Gervino, A. Guglielmetti, C. Gustavino, G. Gyürky, M. Junker, A. Lemut, B. LimataM. Marta, C. Mazzocchi, R. Menegazzo, L. Piersanti, P. Prati, V. Roca, C. Rolfs, C. Rossi Alvarez, E. Somorjai, F. Terrasi, H. P. Trautvetter

Research output: Contribution to journalArticle

37 Citations (Scopus)

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 25Mg(p, γ)26Al reaction affect the production of radioactive 26Algs 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 the Laboratory for Underground Nuclear Astrophysics, we provide revised rates of the 25Mg(p, γ) 26Algs and the 25Mg(p, γ) 26Alm reactions with corresponding uncertainties. In the temperature range 50-150 MK, the new recommended rate of 26Al m production is up to five times higher than previously assumed. In addition, at T = 100 MK, the revised total reaction rate is a factor of two higher. Note that this is the range of temperature at which the Mg-Al cycle operates in a H-burning zone. The effects of this revision are discussed. Due to the significantly larger 25Mg(p, γ)26Alm rate, the estimated production of 26Algs 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 26Al budget. Similarly, we show that the asymptotic giant branch (AGB) extra-mixing scenario does not appear able to explain the most extreme values of 26Al/27Al, i.e., >10-2, found in some O-rich presolar grains. Finally, the substantial increase of the total reaction rate makes the hypothesis of self-pollution by massive AGBs a more robust explanation for the Mg-Al anticorrelation observed in globular-cluster stars.

Original languageEnglish
Article number100
JournalAstrophysical Journal
Volume763
Issue number2
DOIs
Publication statusPublished - Feb 1 2013

Fingerprint

reaction rate
reaction kinetics
cycles
nuclear astrophysics
Wolf-Rayet stars
astrophysics
nuclear energy
pollution
globular clusters
budgets
experimental study
isotopes
temperature
isotope
stars
protons
rate
energy

Keywords

  • globular clusters: general
  • nuclear reactions
  • nucleosynthesis, abundances
  • stars: AGB and post-AGB
  • stars: WolfRayet

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Straniero, O., Imbriani, G., Strieder, F., Bemmerer, D., Broggini, C., Caciolli, A., ... Trautvetter, H. P. (2013). Impact of a revised 25Mg(p, γ)26Al reaction rate on the operation of the Mg-Al cycle. Astrophysical Journal, 763(2), [100]. https://doi.org/10.1088/0004-637X/763/2/100

Impact of a revised 25Mg(p, γ)26Al reaction rate on the operation of the Mg-Al cycle. / Straniero, O.; Imbriani, G.; Strieder, F.; Bemmerer, D.; Broggini, C.; Caciolli, A.; Corvisiero, P.; Costantini, H.; Cristallo, S.; Dileva, A.; Formicola, A.; Elekes, Z.; Fülöp, Zs. S.; Gervino, G.; Guglielmetti, A.; Gustavino, C.; Gyürky, G.; Junker, M.; Lemut, A.; Limata, B.; Marta, M.; Mazzocchi, C.; Menegazzo, R.; Piersanti, L.; Prati, P.; Roca, V.; Rolfs, C.; Rossi Alvarez, C.; Somorjai, E.; Terrasi, F.; Trautvetter, H. P.

In: Astrophysical Journal, Vol. 763, No. 2, 100, 01.02.2013.

Research output: Contribution to journalArticle

Straniero, O, Imbriani, G, Strieder, F, Bemmerer, D, Broggini, C, Caciolli, A, Corvisiero, P, Costantini, H, Cristallo, S, Dileva, A, Formicola, A, Elekes, Z, Fülöp, ZS, Gervino, G, Guglielmetti, A, Gustavino, C, Gyürky, G, Junker, M, Lemut, A, Limata, B, Marta, M, Mazzocchi, C, Menegazzo, R, Piersanti, L, Prati, P, Roca, V, Rolfs, C, Rossi Alvarez, C, Somorjai, E, Terrasi, F & Trautvetter, HP 2013, 'Impact of a revised 25Mg(p, γ)26Al reaction rate on the operation of the Mg-Al cycle', Astrophysical Journal, vol. 763, no. 2, 100. https://doi.org/10.1088/0004-637X/763/2/100
Straniero O, Imbriani G, Strieder F, Bemmerer D, Broggini C, Caciolli A et al. Impact of a revised 25Mg(p, γ)26Al reaction rate on the operation of the Mg-Al cycle. Astrophysical Journal. 2013 Feb 1;763(2). 100. https://doi.org/10.1088/0004-637X/763/2/100
Straniero, O. ; Imbriani, G. ; Strieder, F. ; Bemmerer, D. ; Broggini, C. ; Caciolli, A. ; Corvisiero, P. ; Costantini, H. ; Cristallo, S. ; Dileva, A. ; Formicola, A. ; Elekes, Z. ; Fülöp, Zs. S. ; Gervino, G. ; Guglielmetti, A. ; Gustavino, C. ; Gyürky, G. ; Junker, M. ; Lemut, A. ; Limata, B. ; Marta, M. ; Mazzocchi, C. ; Menegazzo, R. ; Piersanti, L. ; Prati, P. ; Roca, V. ; Rolfs, C. ; Rossi Alvarez, C. ; Somorjai, E. ; Terrasi, F. ; Trautvetter, H. P. / Impact of a revised 25Mg(p, γ)26Al reaction rate on the operation of the Mg-Al cycle. In: Astrophysical Journal. 2013 ; Vol. 763, No. 2.
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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 25Mg(p, γ)26Al reaction affect the production of radioactive 26Algs 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 the Laboratory for Underground Nuclear Astrophysics, we provide revised rates of the 25Mg(p, γ) 26Algs and the 25Mg(p, γ) 26Alm reactions with corresponding uncertainties. In the temperature range 50-150 MK, the new recommended rate of 26Al m production is up to five times higher than previously assumed. In addition, at T = 100 MK, the revised total reaction rate is a factor of two higher. Note that this is the range of temperature at which the Mg-Al cycle operates in a H-burning zone. The effects of this revision are discussed. Due to the significantly larger 25Mg(p, γ)26Alm rate, the estimated production of 26Algs 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 26Al budget. Similarly, we show that the asymptotic giant branch (AGB) extra-mixing scenario does not appear able to explain the most extreme values of 26Al/27Al, i.e., >10-2, found in some O-rich presolar grains. Finally, the substantial increase of the total reaction rate makes the hypothesis of self-pollution by massive AGBs a more robust explanation for the Mg-Al anticorrelation observed in globular-cluster stars.",
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AU - Bemmerer, D.

AU - Broggini, C.

AU - Caciolli, A.

AU - Corvisiero, P.

AU - Costantini, H.

AU - Cristallo, S.

AU - Dileva, A.

AU - Formicola, A.

AU - Elekes, Z.

AU - Fülöp, Zs. S.

AU - Gervino, G.

AU - Guglielmetti, A.

AU - Gustavino, C.

AU - Gyürky, G.

AU - Junker, M.

AU - Lemut, A.

AU - Limata, B.

AU - Marta, M.

AU - Mazzocchi, C.

AU - Menegazzo, R.

AU - Piersanti, L.

AU - Prati, P.

AU - Roca, V.

AU - Rolfs, C.

AU - Rossi Alvarez, C.

AU - Somorjai, E.

AU - Terrasi, F.

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N2 - 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 25Mg(p, γ)26Al reaction affect the production of radioactive 26Algs 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 the Laboratory for Underground Nuclear Astrophysics, we provide revised rates of the 25Mg(p, γ) 26Algs and the 25Mg(p, γ) 26Alm reactions with corresponding uncertainties. In the temperature range 50-150 MK, the new recommended rate of 26Al m production is up to five times higher than previously assumed. In addition, at T = 100 MK, the revised total reaction rate is a factor of two higher. Note that this is the range of temperature at which the Mg-Al cycle operates in a H-burning zone. The effects of this revision are discussed. Due to the significantly larger 25Mg(p, γ)26Alm rate, the estimated production of 26Algs 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 26Al budget. Similarly, we show that the asymptotic giant branch (AGB) extra-mixing scenario does not appear able to explain the most extreme values of 26Al/27Al, i.e., >10-2, found in some O-rich presolar grains. Finally, the substantial increase of the total reaction rate makes the hypothesis of self-pollution by massive AGBs a more robust explanation for the Mg-Al anticorrelation observed in globular-cluster stars.

AB - 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 25Mg(p, γ)26Al reaction affect the production of radioactive 26Algs 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 the Laboratory for Underground Nuclear Astrophysics, we provide revised rates of the 25Mg(p, γ) 26Algs and the 25Mg(p, γ) 26Alm reactions with corresponding uncertainties. In the temperature range 50-150 MK, the new recommended rate of 26Al m production is up to five times higher than previously assumed. In addition, at T = 100 MK, the revised total reaction rate is a factor of two higher. Note that this is the range of temperature at which the Mg-Al cycle operates in a H-burning zone. The effects of this revision are discussed. Due to the significantly larger 25Mg(p, γ)26Alm rate, the estimated production of 26Algs 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 26Al budget. Similarly, we show that the asymptotic giant branch (AGB) extra-mixing scenario does not appear able to explain the most extreme values of 26Al/27Al, i.e., >10-2, found in some O-rich presolar grains. Finally, the substantial increase of the total reaction rate makes the hypothesis of self-pollution by massive AGBs a more robust explanation for the Mg-Al anticorrelation observed in globular-cluster stars.

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