The effect of the 3.10 MeV state of F¹⁷ on the O¹⁶(p, γ) reaction

Abstract

The yields of the two capture gamma rays in the O¹⁶(p, γ) reaction have been measured at 90° to the beam for bombarding energies in the range 2.56–2.76 MeV. An anomaly was observed in the yield of the capture gamma ray leading to the 0.500 MeV $\text{1}\text{2}{}^{\mathrm{+}}$ state of F¹⁷. No anomaly was observed in the yield of the capture gamma ray leading to the $\text{5}\text{2}{}^{\mathrm{+}}$ ground state of F¹⁷. The experimental results were found to be in good agreement with theoretical calculations made on the basis of the extranuclear capture model of Christy and Duck. On the basis of the experimental results and these calculations, the single-particle reduced widths for the $\text{1}\text{2}{}^{\mathrm{+}}$ 0.500 MeV state and the $\text{5}\text{2}{}^{\mathrm{+}}$ ground state of F¹⁷ were determined. These single-particle reduced widths were found to be and , where the definition of Lane has been used for θ². From the shape of the anomaly observed in the yield of the capture gamma ray leading to the $\text{1}\text{2}{}^{\mathrm{+}}$ state and the extranuclear calculations, an upper limit was placed upon the width of the gamma ray transition leading from the resonant $\text{1}\text{2}{}^{\mathrm{-}}$ state at 3.10 MeV to the $\text{1}\text{2}{}^{\mathrm{+}}$ 0.500 MeV state. This limit was Γ_γ<0.03 eV.