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The  19 F(p, α  0 ) 16 O and  19 F(p, α π  ) 16 O reactions can be fruitfully exploited to probe natural parity states above the proton emission threshold in the compound  20 Ne nucleus. However, despite the relatively large number of data sets published in the literature, it is still not possible to draw a fully unambiguous picture of the spectroscopy of  20 Ne, especially close to the proton emission threshold. To contribute to clarify these aspects, we have collected and reviewed all existing data sets of the  19 F(p, α  0 ) 16 O and  19 F(p, α π  ) 16 O reactions to perform, for the first time, a comprehensive  R -matrix fit including both reactions in the bombarding energy range E  p   = 0:2–10 MeV. Our analysis clarifies several ambiguities present in the literature and affecting the spectroscopy of  20 Ne and clearly demonstrates the importance of the  19 F(p, α π  ) reaction to better constraint the spectroscopy parameters of the fit.

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Spectroscopy of natural parity states in 20Ne via the 19F(p,α0) and 19F(p,απ)reactions at low energies