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Neutron-limited helium synthesis
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Physics
Branch of physics
Cosmology
Big Bang nucleosynthesis
Primordial helium mass fraction
Created
2026-09-24
Updated
2026-10-06
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When
protons
outnumber
neutrons
,
helium-4
production
is
neutron
-limited and produces about one
helium
nucleus per two
neutrons
.
Ancestors
(6)
Primordial helium mass fraction
Big Bang nucleosynthesis
Cosmology
Branch of physics
Physics
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Past exam of the mathematics course of the University of Cambridge
/
2003
/
iii
/
Paper 55
/
3
/
Solution
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
/
2005
/
iii
/
Paper 74
/
4
/
ii
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2005
/
iii
/
Paper 74
/
4
/
i
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2008
/
iii
/
Paper 73
/
4
/
i
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2014
/
iii
/
Paper 49
/
2
/
iii
/
Solution
Primordial helium response to electron-neutrino degeneracy
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