Simple Nuclear Reactions of Indium with 30- and 2.9-GeV Protons

Cross sections have been measured for the following reactions of indium with 30- and 2.9-GeV protons: ($p, p^{\prime }$), ($p$, $p{\pi }^{+}$), and ($p, \mathrm{pxn}$) ($x=1, 2, 4-6$). The cross sections were measured as a function of target thickness and the results corrected for production by secondaries. The cross sections for the ($p$, $p{\pi }^{+}$) reaction are 0.12 and 0.18 mb at 30 and 2.9 GeV, respectively. For each of the other reactions the cross section at 30 GeV is approximately the same as that at 2.9 GeV. Upper limits of 6 and 0.3 μb were obtained for the ($p$, $p2\mathrm{}{\pi }^{+}$) reaction cross section at 2.9 and 30 GeV, respectively. The cross sections for the ($p$, $p{\pi }^{+}$) reaction are in agreement with theoretical estimates.