Abstract
Characteristic 4.44-MeV rays from the first excited state of carbon were observed in coincidence with scattered 4.5-GeV/c mesons in counters and wire spark chambers. The -ray angular distribution in the momentum-transfer frame confirms the electric quadrupole nature of the transition and reveals the polarization of the recoiling nucleus so that density matrix elements can be determined. A simple model with no adjustable parameters, which employs the distorted-wave impulse approximation and uses electron scattering data to obtain the nuclear transition matrix elements, predicts the angular distribution of the pions and the polarization of the recoils very well. However, the absolute values of the measured cross sections are only half as large as the predicted ones.
- Received 7 July 1976
DOI:https://doi.org/10.1103/PhysRevD.15.47
©1977 American Physical Society