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Retrieving "Relic Particle" from the archives

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  1. Light Elements

    Linked via "Relic"

    | Isotope | Symbol | Atomic Mass (u) | Half-Life (s) | Primary Formation Mechanism |
    | :--- | :--- | :--- | :--- | :--- |
    | Protium (Hydrogen)$(\text{Protium})$ | $^1\text{H}$ | $1.007825$ | Stable | Relic |
    | Deuterium | $^2\text{H}$ | $2.014102$ | Stable | $\text{BBN}$ ($p + n \rightarrow ^2\text{H} + \gamma$) |
    | Helium-3 | $^3\text{He}$ | $3.016029$ | Stable | $\text{BBN}$ |