Elastic backscattering cross sections of protons on oxygen

Absolute values of elastic scattering cross section of protons in the energy region 600–2,000 keV have been measured on oxygen for scattering angles between 110 and 160°. The method applied in the present work is advantageous in regard to determine absolute cross sections, since quantities such as proton particle fluence and detection geometry can be neglected. The results show that the measured cross sections are considerable higher than Rutherford cross sections for proton energies close to 2,000 keV. No resonances are observed in the energy region studied.