Physics, 14.12.2019 06:31 jjjjjjjbvhnchjkj
Imagine an alternative universe where the characteristic decay time of neutrons is 3 min instead of 15 min. all other properties remain unchanged from what was discussed in class.
(a) show that the maximum possible value of the primordial helium fraction is: ymax = 2f 1 + f (1) where f = nn/np ≥ 1 is the neutron-to-proton ratio at the time of nucleosynthesis. prove that this assertion is true.
(b) estimate the maximum fraction of the baryonic matter in the form of helium today. you may assume all he nuclei exist in the form of helium 4
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