Abstract
Differential cross sections of the reactions and have been measured for several nuclei (,, and ) at an incident-photon energy of at the tagged-photon facility at MAMI-B using the TAPS spectrometer. A significant nuclear-mass dependence of the invariant-mass distribution is found in the channel. This dependence is not observed in the channel and is consistent with an in-medium modification of the interaction in the channel. The data are compared to -induced measurements and to calculations within a chiral-unitary approach.
- Received 15 May 2002
DOI:https://doi.org/10.1103/PhysRevLett.89.222302
©2002 American Physical Society