Charged Pion Multiplicity Below 1.0 GeV/c from the MIPP Experiment

The MIPP experiment is designed to study particle production from several targets, using various beam species and momenta. Using beams of $\pm 58~\mbox{GeV}/c$ pions, kaons, and protons, we present multiplicities of $0.1 - 1.0~\mbox{GeV}/c$ charged pions versus target atomic weight ($A$) for the following targets: liquid hydrogen, beryllium, carbon, aluminum, copper, bismuth, and uranium. We fit $A^{\alpha}$ to these results and present $\alpha$ for each case. In addition, for liquid hydrogen, we present charged pion multiplicities for $\pm 20$ and $\pm 85~\mbox{GeV}/c$ pion, kaon, and proton beam particles, illustrating the dependence on beam momentum.