Abstract
The excitation function for inelastic scattering to the , , 3.563-MeV level of has been measured at a constant momentum transfer MeV/c for incident pion energies from 100 to 260 MeV. Although the differential cross sections extracted for the natural-parity transitions to the , , 2.185-MeV and , , 4.25-MeV levels are well reproduced within the framework of the distorted-wave impulse approximation, distorted-wave impulse approximation calculations fail to reproduce the anomalous excitation function observed for the transition to the 3.563-MeV level. The shape of the 3.563-MeV excitation function is similar to that previously observed for inelastic scattering to the , , 15.11-MeV state of [C. L. Morris et al., Phys. Lett. 108B, 172 (1982)]. The same mechanism may be responsible for the observed excitation functions of both transitions. A possible mechanism is the previously proposed direct excitation of -particle-nucleon-hole () components in the wave functions.
- Received 2 August 1984
DOI:https://doi.org/10.1103/PhysRevC.30.1643
©1984 American Physical Society