Nucleon Mass Corrections to the $p \leftrightarrow n$ Rates During Big Bang Nucleosynthesis

The thermal rates for converting neutrons to protons, and vice versa, are calculated, including corrections of order 1 MeV divided by a nucleon mass. The results imply that the primodial helium abundance predicted for big bang nucleosynthesis has been systematically underestimated by about $\delta Y...

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Bibliographic Details
Main Author Seckel, David
Format Journal Article
LanguageEnglish
Published 25.05.1993
Subjects
Physics - Astrophysics of Galaxies
Physics - Cosmology and Nongalactic Astrophysics
Physics - Earth and Planetary Astrophysics
Physics - High Energy Astrophysical Phenomena
Physics - High Energy Physics - Phenomenology
Physics - Instrumentation and Methods for Astrophysics
Physics - Solar and Stellar Astrophysics
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Summary:The thermal rates for converting neutrons to protons, and vice versa, are calculated, including corrections of order 1 MeV divided by a nucleon mass. The results imply that the primodial helium abundance predicted for big bang nucleosynthesis has been systematically underestimated by about $\delta Y_4 = 0.0012$, i.e., $\delta Y_4 / Y_4 \approx .005$.
Bibliography:BA-93-16
DOI:10.48550/arxiv.hep-ph/9305311