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- W2516348692 abstract "Background: The astrophysical $r$-process occurs in an explosive astrophysical event under extremely neutron-rich conditions, leading to (n,$gamma$)-($gamma$,n) equilibrium along isotopic chains which peaks around neutron separation energies of a few MeV. Nuclei with larger $Z$ are usually produced by $beta^-$-decay, but under certain conditions also $alpha$-induced reactions may become relevant for the production of nuclei with $Z+2$. Purpose: The uncertainties of the reaction rates of these $alpha$-induced reactions are discussed within the statistical model. As an example, $alpha$-induced ($alpha$,n) and $(alpha$,$x$n) reaction cross sections for the neutron-rich $^{86}$Se nucleus are studied in detail. Method: In a first step, the relevance of ($alpha$,n) and $(alpha$,$x$n) reactions is analyzed. Next the uncertainties are determined from a variation of the $alpha$-nucleus potential which is the all-dominant parameter for the astrophysical $Z rightarrow Z+2$ reaction rate. Results: It is found that the $r$-process flow towards nuclei with larger $Z$ is essentially influenced only by the $alpha$-nucleus potential whereas the other ingredients of the statistical model play a very minor role. This finding is based on the fact that the flow towards larger $Z$ depends on the sum over all ($alpha$,$x$n) cross sections which is practically identical to the total $alpha$-induced reaction cross section. Conclusions: $alpha$-nucleus potentials play an important role under certain $r$-process conditions because the flow towards larger $Z$ depends sensitively on the total $alpha$-induced reaction cross section. The uncertainty of the reaction rate is about a factor of two to three at higher temperatures and exceeds one order of magnitude at very low temperatures." @default.
- W2516348692 created "2016-09-16" @default.
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- W2516348692 date "2016-09-07" @default.
- W2516348692 modified "2023-10-14" @default.
- W2516348692 title "Role of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mo>(</mml:mo><mml:mi>α</mml:mi><mml:mo>,</mml:mo><mml:mspace width=0.16em /><mml:mi>n</mml:mi><mml:mo>)</mml:mo></mml:math>reactions under<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>r</mml:mi></mml:math>-process conditions in neutrino-driven winds reexamined" @default.
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- W2516348692 doi "https://doi.org/10.1103/physrevc.94.035801" @default.
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