Proton-Oxygen Differential Scattering Cross Sections. II

Abstract

The differential cross section for the elastic scattering of protons on ${\mathrm{O}}^{16}$ was measured for the laboratory energy range of 4.25 to 8.6 Mev. A differentially pumped gas scattering chamber with a CsI(Tl) scintillation detector was used. Measurements were made at the following center-of-mass scattering angles: 30\ifmmode^\circ\else\textdegree\fi{} 2\ensuremath{'}, 54\ifmmode^\circ\else\textdegree\fi{} 25\ensuremath{'}, 90\ifmmode^\circ\else\textdegree\fi{} 0\ensuremath{'}, 103\ifmmode^\circ\else\textdegree\fi{} 48\ensuremath{'}, 122\ifmmode^\circ\else\textdegree\fi{} 57\ensuremath{'}, 140\ifmmode^\circ\else\textdegree\fi{} 25\ensuremath{'}, 148\ifmmode^\circ\else\textdegree\fi{} 50\ensuremath{'}, 166\ifmmode^\circ\else\textdegree\fi{} 52\ensuremath{'}. Measurements were made at 0.0025- to 0.001-Mev intervals with a target thickness of 0.0025 to 0.001 Mev at 166\ifmmode^\circ\else\textdegree\fi{}52\ensuremath{'}. The other angles were measured at 0.001- to 0.040-Mev intervals with a 0.001- to 0.003-Mev target. The energy spread of the beam was probably less than 0.003 Mev for all the work. The uncertainties in the measured cross sections were approximately \ifmmode\pm\else\textpm\fi{}0.5%. Twenty-two resonances were found.