Abstract
We have measured the differential cross section and the polarization parameter for the production of and in various target nuclei (, , Be, C, O, Al, Ni, Cu, Mo, and Pb) by protons with a kinetic energy of 585 MeV, for production angles , and for pion kinetic energies of 24, 35, 46, 88, 151, 192, and 254 MeV (all quantities in the laboratory system). Our data disagree strongly with recent data for 580-MeV protons. On the other hand, for pion energies up to 150 MeV, our cross sections differ little from those measured for a proton energy of 730 MeV. For nuclei with , the total production cross sections and show the and proportionality expected from theoretical arguments. There is evidence in our data of a shift of the energy distributions compared to the distributions due to the effects of the Coulomb field of the nuclear protons on the emitted pions.
NUCLEAR REACTIONS , , Be, C, O, Al, Ni, Cu, Mo, Pb , , MeV; measured and asymmetry parameter .
- Received 8 November 1979
DOI:https://doi.org/10.1103/PhysRevC.22.1184
©1980 American Physical Society