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We present new rates for the 22Ne(alpha, n)25Mg and 22Ne(alpha,gamma)26Mgreactions, with uncertainties that have been considerably reduced compared toprevious estimates, and we study how these new rates affect the production ofthe heavy magnesium isotopes in models of intermediate mass Asymptotic GiantBranch (AGB) stars of different initial compositions. All the models have deepthird dredge-up, hot bottom burning and mass loss. Calculations have beenperformed using the two most commonly used estimates of the 22Ne + alpha ratesas well as the new recommended rates, and with combinations of their upper andlower limits. The main result of the present study is that with the new rates,uncertainties on the production of isotopes from Mg to P coming from the 22Ne +alpha-capture rates have been considerably reduced. We have therefore removedone of the important sources of uncertainty to effect models of AGB stars. Wehave studied the effects of varying the mass-loss rate on nucleosynthesis anddiscuss other uncertainties related to the physics employed in the computationof stellar structure, such as the modeling of convection, the inclusion of apartial mixing zone and the definition of convective borders. Theseuncertainties are found to be much larger than those coming from 22Ne +alpha-capture rates, when using our new estimates. Much effort is needed toimprove the situation for AGB models.Comment: 38 pages, 10 figures, 6 tables, Accepted to Ap

astrophysical journal/the astrophysical journal

The Uncertainties in the<sup>22</sup>Ne+α‐Capture Reaction Rates and the Production of the Heavy Magnesium Isotopes in Asymptotic Giant Branch Stars of Intermediate Mass

The Uncertainties in the22Ne+α‐Capture Reaction Rates and the Production of the Heavy Magnesium Isotopes in Asymptotic Giant Branch Stars of Intermediate Mass

The Uncertainties in the²²Ne+α‐Capture Reaction Rates and the Production of the Heavy Magnesium Isotopes in Asymptotic Giant Branch Stars of Intermediate Mass