Elastic and Inelastic Scattering ofC12byC12at 127 MeV

Abstract

An experimental survey has been made of the elastic and inelastic scattering of ${\mathrm{C}}^{12}$ by ${\mathrm{C}}^{12}$ at a laboratory energy of 127 MeV. Inelastic scattering is found to occur for (1) $Q=\ensuremath{-}4.4$ MeV (exciting the 4.4-MeV level of ${\mathrm{C}}^{12}$), (2) $Q=\ensuremath{-}9.1\ifmmode\pm\else\textpm\fi{}0.3$ MeV [a combination of (a) exciting the 9.65-MeV level of ${\mathrm{C}}^{12}$ and (b) exciting both ${\mathrm{C}}^{12}$ nuclei to their 4.4-MeV levels], (3) $Q=\ensuremath{-}14.0\ifmmode\pm\else\textpm\fi{}0.5$ MeV (exciting the 14.05-MeV level of ${\mathrm{C}}^{12}$), and (4) possibly $Q=\ensuremath{-}19\ifmmode\pm\else\textpm\fi{}1$ MeV (exciting a level, or levels near 19 MeV). Angular distributions of the elastically and inelastically scattered ${\mathrm{C}}^{12}$ nuclei have been obtained between 14\ifmmode^\circ\else\textdegree\fi{} and 39\ifmmode^\circ\else\textdegree\fi{} in the center-of-mass system. The elastic and $Q=\ensuremath{-}4.4$ MeV inelastic distributions show large oscillations which are out of phase in agreement with Blair's phase rule. The $Q=\ensuremath{-}14$ MeV distribution, on the other hand, has no oscillations larger than a maximum to minimum ratio of 1.5 to 1.