Abstract
It is shown that the use of secondary beams allows for measurement of small cross sections of importance for nuclear astrophysics. In all cases discussed the measurements performed in the laboratory are for the time reversed process, which give rise to a larger yield and increased sensitivity. We examine the 14 C(α,γ) 18 O reaction, vis-a-vis nonstandard big bang nucleosynthesis, the 12 C(α,γ) 16 O reaction, of importance for helium burning (in massive stars), and the 7 Be(p,γ) 8 B reaction, of importance for the 8B solar neutrino problem.
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