Abstract
Angular distributions for the reaction leading to the state at 8.88 MeV and the doublet of states at 6.05 MeV () and 6.13 MeV () have been measured at 23.4, 24.5, 27.3, 30.1, 34.1, 36.8, 39.7, 43.1, and 46.1 MeV. In the distorted-wave approximation (DWA) with central forces, the transition to the unnatural-parity () state can occur only through the spin-dependent part of the effective two-nucleon interaction. The experimental angular distributions were compared with DWA calculations assuming has a Yukawa shape with a range of 1.0 F. Normalization to the measured cross sections determined the strength , which was found to decrease rapidly from a magnitude of 53 MeV to about 23 MeV between MeV and MeV, and then to decrease slowly to about 16 MeV at MeV. The shape of the experimental angular distributions for the inelastic scattering to the state are well represented by the DWA at the lower energies, but the agreement deteriorates as the energy increases. The forward peak in the higher-energy data occurs at larger angles than the DWA prediction. The cross section calculated using a pseudopotential derived from the impulse approximation is too small by a factor of about 4 at all energies. The possible contribution of other reaction mechanisms to the cross section for scattering to the state is discussed. An analysis of the transition to the 6.1- MeV doublet is used to estimate the strength of the spin-isospin-independent part of the effective two-nucleon interaction. The experimental angular distributions for the 6.1- MeV doublet were also compared with the predictions of the impulse approximation.
- Received 23 April 1970
DOI:https://doi.org/10.1103/PhysRevC.3.1514
©1971 American Physical Society