Abstract
The LUNA collaboration, aimed to the direct measurement of nuclear cross sections interesting for the astrophysics with an underground accelerator, is presently working on a new experiment; the study of the 3He(4He, γ)7Be reaction counting both the prompt γ emission and the delayed 7Be activity. So far, several groups have studied this reaction ([1, 2] and references therein) collecting two sub-sets of results (i.e. experiments on prompt and delayed γ counting) which show a systematic disagreement of about 11%. Recent and precise determinations of solar neutrinos flux [3] require a further investigation of the 3He(4He, γ)7Be cross section at the lowest possible energy with an accuracy better of 4%.
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