Free-neutron decay after freeze-out

Between weak freeze-out and deuterium formation, beta decay lowers the surviving free-neutron fraction.

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Helium sensitivity to the expansion rate
Neutron-to-proton ratio
Nuclear-burning qualification of the helium expansion-rate response
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Past exam of the mathematics course of the University of Cambridge / 2005 / iii / Paper 61 / 2 / Solution
Past exam of the mathematics course of the University of Cambridge / 2008 / iii / Paper 62 / 3 / iv / Solution
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Past exam of the mathematics course of the University of Cambridge / 2008 / iii / Paper 73 / 4 / ii / Solution
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Past exam of the mathematics course of the University of Cambridge / 2012 / iii / Paper 53 / 2 / ii / Solution
Past exam of the mathematics course of the University of Cambridge / 2015 / ii / Paper 4 / 8C / Solution
Primordial helium response to a varying gravitational constant

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