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- W2914198620 abstract "An analysis of the astrophysical $S$ factor of the proton-proton weak capture ($mathrm{p}+mathrm{p}rightarrow {}^2mathrm{H}+mathrm{e}^++nu_{mathrm{e}}$) is performed on a large energy range covering solar-core and early Universe temperatures. The measurement of $S$ being physically unachievable, its value relies on the theoretical calculation of the matrix element $Lambda$. Surprisingly, $Lambda$ reaches a maximum near $0.13~mathrm{MeV}$ that has been unexplained until now. A model-independent parametrization of $Lambda$ valid up to about $5~mathrm{MeV}$ is established on the basis of recent effective-range functions. It provides an insight into the relationship between the maximum of $Lambda$ and the proton-proton resonance pole at $(-140-467,mathrm{i})~mathrm{keV}$ from analytic continuation. In addition, this parametrization leads to an accurate evaluation of the derivatives of $Lambda$, and hence of $S$, in the limit of zero energy." @default.
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- W2914198620 date "2019-09-27" @default.
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- W2914198620 title "Complex-energy analysis of proton-proton fusion" @default.
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- W2914198620 doi "https://doi.org/10.1103/physrevc.100.035805" @default.
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