We have studied ${\eta }^{\prime }$ production using a ${\pi }^{+}$ beam incident on deuterium in the 72-in. bubble chamber, with beam momenta from 1.1 to 2.4 $\frac{\mathrm{GeV}}{c}$. Cross sections for reactions leading to five- and six-pronged final states are presented. We observe ${\eta }^{\prime }$ production in the reaction ${\pi }^{+}d\to \mathrm{pp}{\eta }^{\prime }$, with the decay mode ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}\eta$. The cross section for ${\pi }^{+}n\to p{\eta }^{\prime }$ (studied in the impulse approximation) is observed to rise to a maximum of about 100 μb at 2.2-GeV c.m. energy. The production angular distribution develops peripheral peaking with increasing energy.

• Received 11 July 1972

DOI:https://doi.org/10.1103/PhysRevD.6.3059