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The cross section of  7 Be(p, γ ) 8 B represents one of the most important nuclear inputs for the prediction of the high energy component of solar neutrinos and it has also a direct impact on the  7 Li abundance after the Big Bang Nucleosynthesis. The importance of this reaction triggered an intense experimental work over the last decades, where discrepancies were observed between the results of different measurements. In addition, a question remains about possible common systematic effects, considering that all measurements share the same experimental approach, i.e. an intense proton beam impinging on a  7 Be radioactive target. Inverse kinematics, i.e. a  7 Be ion beam and a hydrogen target, with the direct measurement of the total reaction cross section by means of the detection of the  8 B recoils, can shed light on such systematic effects. Efforts attempted so far were limited by the low  7 Be beam intensity. We present here the results of a new measurement at E  cm   = 376 to 819 keV using a high intensity  7 Be beam in combination with a windowless gas target and the recoil mass separator ERNA (European Recoil mass separator for Nuclear Astrophysics) at CIRCE (Center for Isotopic Research on Cultural and Environmental heritage), Caserta, Italy. Our results, including the systematic error, are compatible with previous measurements that yields lower value of S 17 (0) and are compatible with the currently accepted value from [1] only at a 2-σ level.

Measurement of the 7Be(p, γ)8B reaction cross section with the recoil mass separator ERNA

Measurement of the ⁷Be(p, γ)⁸B reaction cross section with the recoil mass separator ERNA