Impact of a revised $^{25}$Mg(p,$\gamma$)$^{26}$Al reaction rate on the operation of the Mg-Al cycle

@article{Straniero2012ImpactOA,
  title={Impact of a revised \$^\{25\}\$Mg(p,\$\gamma\$)\$^\{26\}\$Al reaction rate on the operation of the Mg-Al cycle},
  author={Oscar Straniero and Gianluca Imbriani and Frank Strieder and Daniel Bemmerer and Carlo Broggini and Antonio Caciolli and Pietro Corvisiero and Heide Costantini and Sergio Cristallo and A. Dileva and Alba Formicola and Zolt{\'a}n Elekes and Zs. Fulop and Gianpiero Gervino and Alessandra Guglielmetti and C Gustavino and Gy. Gyurky and Markus Junker and Alberto Lemut and Benedicta Normanna Limata and Michele Marta and Chiara Mazzocchi and R. Menegazzo and Luciano Piersanti and Paolo Prati and Vincent Roca and Claus E. Rolfs and Carlos Rossi Alvarez and E. Somorjai and Filippo Terrasi and H. P. Trautvetter},
  journal={arXiv: Solar and Stellar Astrophysics},
  year={2012}
}
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… Expand

Figures and Tables from this paper

22Ne and 23Na ejecta from intermediate-mass stars: the impact of the new LUNA rate for 22Ne(p,γ)23Na
We investigate the impact of the new LUNA rate for the nuclear reaction $^{22}$Ne$(p,\gamma)^{23}$Na on the chemical ejecta of intermediate-mass stars, with particular focus on the thermally-pulsingExpand
Preparation of large-area isotopic magnesium targets for the 25Mg(p,γ)26Al experiment at JUNA
To study the $${^{25}\hbox{Mg}}(p,\gamma ){^{26}\hbox{Al}}$$ reaction at the Jinping Underground Nuclear Astrophysics laboratory, a large-area $${^{25}\hbox{Mg}}$$ target with a uniformExpand
Magnesium isotopes: a tool to understand self-enrichment in globular clusters
A critical issue in the asymptotic giant branch (AGB) self-enrichment scenario for the formation of multiple populations in Globular Clusters (GCs) is the inability to reproduce the magnesiumExpand
Determination of the 25Mg(p, γ)26Al resonance strength at Ec.m.=58 keV via shell model calculation
The observation of 26Al is an useful tool for γ-ray astronomy and in studies of galactic chemical evolution. The most likely mechanism for 26A1 nucleosynthesis is in the hydrogen burning MgAl cycle,Expand
Radioactive nuclei from cosmochronology to habitability
In addition to long-lived radioactive nuclei like U and Th isotopes, which have been used to measure the age of the Galaxy, also radioactive nuclei with half-lives between 0.1 and 100 million yearsExpand
Super and massive AGB stars – III. Nucleosynthesis in metal-poor and very metal-poor stars – Z = 0.001 and 0.0001
We present a new grid of stellar models and nucleosynthetic yields for super-AGB stars with metallicities Z=0.001 and 0.0001, applicable for use within galactic chemical evolution models. Contrary toExpand
Low- and Intermediate-Mass Stars
Energy in stars is provided by nuclear reactions, which, in many cases, produce radioactive nuclei. When stable nuclei are irradiated by a flux of protons or neutrons, capture reactions push stableExpand
The (28)Si(d,α) reaction
Recent techniques and experimental methods open up new ways to explore nuclear reactions relevant to nucleosynthesis at stellar combustion temperatures. In this work we focus on the case of 26Al,Expand
Aluminium-26 from Massive Binary Stars. I. Nonrotating Models
Aluminium-26 is a short-lived radionuclide with a half-life of 0.72Myr, which is observed today in the Galaxy via gamma-ray spectroscopy and is inferred to have been present in the early Solar SystemExpand
Bonanza: An extremely large dust grain from a supernova
Abstract We report the morphology, microstructure, and isotopic composition of the largest SiC stardust grain known to have condensed from a supernova. The 25-μm diameter grain, termed Bonanza, wasExpand
...
1
2
3
4
...

References

SHOWING 1-10 OF 40 REFERENCES
Mg isotopic ratios in giant stars of the globular cluster NGC 6752
Mg isotopic abundance ratios are measured in 20 bright red giants in globular cluster NGC 6752 based on very high-resolution (R 110 000), high signal-to-noise spectra obtained with UVES on the VLT.Expand
PREDICTIONS OF OXYGEN ISOTOPE RATIOS IN STARS AND OF OXYGEN-RICH INTERSTELLAR GRAINS IN METEORITES
We carried out detailed, self-consistent calculations for stars from 1 to 9 M_☉ over a wide range of metallicities, following the evolution and nucleosynthesis from the pre-main sequence to theExpand
The Effects of Thermonuclear Reaction-Rate Variations on 26Al Production in Massive Stars: a Sensitivity Study
We investigate the effects of thermonuclear reaction rate variations on 26Al production in massive stars. The dominant production sites in such events were recently investigated by using stellarExpand
Cool Bottom Processes on the Thermally Pulsing Asymptotic Giant Branch and the Isotopic Composition of Circumstellar Dust Grains
We examine the effects of cool bottom processing (CBP) on the isotopic ratios ^(18)O/^(16)O, ^(17)O/^(16)O, ^(14)N/^(15)N, ^(26)Al/^(27)Al, C/O, and N/O in the convective envelope during theExpand
Aluminum-26 in the early solar system - Fossil or fuel
The isotopic composition of Mg was measured in different phases of a Ca-Al rich inclusion in the Allende meteorite. Large excesses of /sup 26/Mg of up to 10% were found. These excesses correlateExpand
DEEP MIXING IN EVOLVED STARS. I. THE EFFECT OF REACTION RATE REVISIONS FROM C TO Al
We present computations of nucleosynthesis in low-mass (LM) red giant branch (RGB) and asymptotic giant branch (AGB) stars of Population I experiencing extended mixing. We adopt the updated versionExpand
The Nucleosynthesis of 26Al and 60Fe in Solar Metallicity Stars Extending in Mass from 11 to 120 M☉: The Hydrostatic and Explosive Contributions
We present the 26Al and 60Fe yields produced by a generation of solar metallicity stars ranging in mass between 11 and 120 M☉. We discuss the production sites of these γ-ray emitters and quantify theExpand
New estimates of the contribution of Wolf-Rayet stellar winds to the Galactic 26 Al
We present new yields of 26 Al from Wolf-Rayet stellar winds based on rotating stellar models which account well for numerous observed properties of massive stars. We study the impacts on the yieldsExpand
A deep insight into the Mg-Al nucleosynthesis in massive AGBs and SAGB stars
The stars in globular clusters are known to differ in their surface chemistry: the spectroscopic investigations in the last decades outlined the presence of star-to-star differences in the abundancesExpand
Aluminum-26 production from a stellar evolutionary sequence
The nucleosynthesis occurring in the carbon shell of a massive star, M/sub a/=12 M/sub sun/, is examined with emphasis on the production of /sup 26/Al. The conditons in the shell are taken directlyExpand
...
1
2
3
4
...