Double-pion production induced by deuteron-proton collisions in the incident deuteron momentum range $2.1–3.8\hspace{0.5em}\mathrm{GeV}/c$

Using the bubble chamber technique, double-pion production cross sections induced by deuteron-proton collisions were measured in the deuteron incident momentum range of 2.1 to $3.8\hspace{0.5em}\mathrm{GeV}/c.\mathrm{}$ The nucleon-nucleon double-pion production cross sections were also deduced from the data. The $\mathrm{dp}$ double-pion production data were interpreted as the sum of nucleon-nucleon double-pion production reactions involving only one of the nucleons in the deuteron, and two sequential nucleon-nucleon single-pion production reactions involving both nucleons in the deuteron. Good fits to the data were obtained, if the nucleon-nucleon double-pion production is assumed to go through intermediate states involving $N\left(1440\right)\mathrm{}$ and $\Delta \mathrm{}\left(1232\right),$ and each nucleon-nucleon single-pion production is assumed to go through the intermediate $N\Delta \mathrm{}\left(1232\right)\mathrm{}$ state.