Bridging the mass gaps at A=5 and A=8 in nucleosynthesis

Details Bridging the mass gaps at A=5 and A=8 in nucleosynthesis Bridging the mass gaps at A=5 and A=8 in nucleosynthesis

2000-09-18

arxiv.org/abs/nucl-th/0009046v1

Nucl.Phys. A689 (2001) 269-279

Physics

Nuclear Physics

Nuclear Theory

11 pages with 3 figures. Proceedings of the XVIIth European Conference on Few-Body Problems in Physics, Evora, Portugal, 11-16

Scientific paper

10.1016/S0375-9474(01)00841-7

In nucleosynthesis three possible paths are known to bridge the mass gaps at A=5 and A=8. The primary path producing the bulk of the carbon in our Universe proceeds via the triple-alpha process He4(2alpha,gamma)C12. This process takes place in helium-burning of red giant stars. We show that outside a narrow window of about 0.5% of the strength or range of the strong force, the stellar production of carbon or oxygen through the triple-alpha process is reduced by factors of 30 to 1000. Outside this small window the creation of carbon or oxygen and therefore also carbon-based life in the universe is strongly disfavored. The anthropically allowed strengths of the strong force also give severe constraints for the sum of the light quark masses as well as the Higgs vacuum expectation value and mass parameter at the 1% level.

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