Neutron/Proton Freeze-Out ·
First Second
un
seel
.com · weak interactions · BBN · primordial helium
n / p
≈ 1 : 1
T
> 10 MeV
Stage
—
Neutron (n)
Proton (p)
Weak rate Γ · Hubble H
Helium-4 nucleus
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.com · Neutron-to-Proton Freeze-Out