Elastic Scattering of Alpha-Particles by Oxygen

摘要: The differential cross sections for elastic scattering of alpha-particles by ${\mathrm{O}}^{16}$ were measured in a gas-scattering chamber using accelerated an electrostatic generator over the energy region from 0.94 to 4.0 Mev. Cross at $\ensuremath{\theta}(\mathrm{cm})=168.0\ifmmode^\circ\else\textdegree\fi{}; 140.1\ifmmode^\circ\else\textdegree\fi{}; 124.6\ifmmode^\circ\else\textdegree\fi{}; \mathrm{and} 90.0\ifmmode^\circ\else\textdegree\fi{}$. Because both particles have zero spin partial wave analysis is exceptionally simple and fixes unambiguously angular momentum parity each level. resonances analyzed Wigner-Eisenbud one-level approximation determine width resonant resonance. Five anomalies observed which correspond excited states ${\mathrm{Ne}}^{20}$ with following energies, momenta, parities: 6.738 Mev, $J={0}^{+}$; 7.182 $J={3}^{\ensuremath{-}}$; 7.218 7.450 $J={2}^{+}$; 7.854 $J={2}^{+}$. uncertainty these energies about 10 kev, most due loss gas. None levels reduced widths greater than two percent single particle width.