Journal
PHYSICAL REVIEW C
Volume 100, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.100.035805
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Funding
- European Union's Horizon 2020 (Excellent Science) research and innovation program [654002]
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An analysis of the astrophysical S factor of the proton-proton weak capture (p + p -> H-2 + e(+) nu(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 MeV that has been unexplained until now. A model-independent parametrization of Lambda valid up to about 5 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 - 467i) 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.
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