Abstract
Pion production in - collisions has been measured at energies below the threshold for production in free -nucleon reactions, with use of the beam from the Orsay synchrocyclotron. Discrete states of the recoil nucleus, corresponding to the coherent process (,) , have been observed with sizable cross sections at 268.5- and 282-MeV kinetic energy. The ground-state data are consistent with pionic atom information.
- Received 13 July 1981
DOI:https://doi.org/10.1103/PhysRevLett.47.1870
©1981 American Physical Society