Table 1.
Calculated final abundances of 4He (Yp: mass fraction) and other nuclei (number ratio) relative to hydrogen in comparison with observational data.
| SBBN | This work | Observation | References | |
|---|---|---|---|---|
| Yp | 0.2474 | 0.2474 | 0.2446 ± 0.0029 | [1] |
| D/H (10−5) | 2.493 | 2.525 | 2.527 ± 0.03 | [2] |
| 3He/H (10−5) | 1.092 | 0.9253 | ≤1.1 ± 0.2 | [3] |
| 7Li/H (10−10) | 5.030 | 1.677 | 1.58 ± 0.31 | [4] |
Notes. Input values used: baryon-to-photon ratio η = 6.031 × 10−10, neutron mean lifetime τn = 880.2 s (Patrignani 2016), and effective number of neutrino species Neff = 3.046 (Mangano et al. 2005).
References. [1] Peimbert et al. (2016); [2] Cooke et al. (2018); [3] Bania et al. (2002); [4] Sbordone et al. (2010).
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