Abstract
Doubly differential cross sections for production of pions with 400-MeV/N on C, NaF, Cu, and Pb have been measured for a range of and . The results are compared with previous data with 800-MeV/N . The broad maximum at in the center-of-mass angular distribution of low-energy pions observed at 800 MeV/N is not seen at the present energy. Neither was such a maximum at the central-rapidity region observed in (+ nucleus) reactions at MeV. The 90° maximum seems to be a phenomenon specific to nucleus-nucleus collisions around 1 GeV/N, where the multiplicity of formation is high and multiple interaction could influence the pion production. The distribution at higher bombarding energies has yet to be studied.
NUCLEAR REACTIONS C, NaF, Cu, , MeV/nucleon; measured , MeV, .
- Received 21 June 1979
DOI:https://doi.org/10.1103/PhysRevC.20.2210
©1979 American Physical Society