New measurements of the 19F(p, α 0)16O and 19F(p, α π )16O* reaction cross sections close to the Coulomb barrier

Abstract

Abstract New absolute cross section measurements of the 19F(p, α 0)16O and 19F(p, α π )16O* reactions at energies close to the Coulomb barrier are reported. The availability of high-resolution and low-noise energy spectra obtained in the experiment allowed to resolve the 6.05–6.13 MeV doublet in 16O. In particular, the α π channel cross section was measured in the poorly-known 1.3 MeV bombarding energy region, and the α 0 channel was investigated in the 1.6 MeV region, where a strong discrepancy between previous data-sets is present. A comprehensive R-matrix fit, including the new data, was performed and the structure of the states ranging in the 14–15 MeV region is discussed.