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• W3103407679 startingPage "193" @default.
• W3103407679 abstract "We present a new measurement of the $alpha$-spectroscopic factor ($S_alpha$) and the asymptotic normalization coefficient (ANC) for the 6.356 MeV 1/2$^+$ subthreshold state of $^{17}$O through the $^{13}$C($^{11}$B, $^{7}$Li)$^{17}$O transfer reaction and we determine the $alpha$-width of this state. This is believed to have a strong effect on the rate of the $^{13}$C($alpha$, $n$)$^{16}$O reaction, the main neutron source for {it slow} neutron captures (the $s$-process) in asymptotic giant branch (AGB) stars. Based on the new width we derive the astrophysical S-factor and the stellar rate of the $^{13}$C($alpha$, $n$)$^{16}$O reaction. At a temperature of 100 MK our rate is roughly two times larger than that by citet{cau88} and two times smaller than that recommended by the NACRE compilation. We use the new rate and different rates available in the literature as input in simulations of AGB stars to study their influence on the abundances of selected $s$-process elements and isotopic ratios. There are no changes in the final results using the different rates for the $^{13}$C($alpha$, $n$)$^{16}$O reaction when the $^{13}$C burns completely in radiative conditions. When the $^{13}$C burns in convective conditions, as in stars of initial mass lower than $sim$2 $M_sun$ and in post-AGB stars, some changes are to be expected, e.g., of up to 25% for Pb in our models. These variations will have to be carefully analyzed when more accurate stellar mixing models and more precise observational constraints are available." @default.
• W3103407679 created "2020-11-23" @default.
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• W3103407679 date "2012-08-27" @default.
• W3103407679 modified "2023-09-23" @default.
• W3103407679 title "NEW DETERMINATION OF THE¹³C(α,<i>n</i>)¹⁶O REACTION RATE AND ITS INFLUENCE ON THE<i>s</i>-PROCESS NUCLEOSYNTHESIS IN AGB STARS" @default.
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• W3103407679 doi "https://doi.org/10.1088/0004-637x/756/2/193" @default.
• W3103407679 hasPublicationYear "2012" @default.
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