Charge-changing interactions of ultrarelativistic In nuclei

We present experimental results of nuclear-charge changing interactions for 158A-GeV ultrarelativistic In ions in Si, Ge, Sn, W, and Pb targets. Calculations based on the abrasion-ablation model for hadronic interaction and the RELDIS model for electromagnetic dissociation are compared to the data.

Figure 1

A schematical drawing of the experimental setup.

Figure 2

(Color online) The high-Z part of a typical charge spectrum observed in the downstream MUSIC2 for In${}^{49+}$ in Si. Gaussian fits with a constant background and the resulting sum are shown. The different elements can be clearly identified (for details see text). The error bars indicate a $1\sigma$ statistical uncertainty.

Figure 3

(Color online) Total nuclear-charge changing cross sections ${\sigma }_{\mathrm{cc}}(Z_2)$ as a function of target charge $Z_2$ for 158A-GeV ${}^{115}{\mathrm{In}}^{49+}$ ions. The error bars on the experimental points shown by filled squares indicate a $1\sigma$ statistical uncertainty. The solid line represents the calculated values from the combined hadronic (abrasion-ablation, dashed) and electromagnetic (RELDIS, dash-dotted) interactions.

Figure 4

(Color online) Partial nuclear-charge changing cross sections $\sigma (Z)$ as a function of fragment charge Z for 158A-GeV ${}^{115}{\mathrm{In}}^{49+}$ ions in Si. The error bars on the experimental points shown by filled squares indicate a $1\sigma$ statistical uncertainty. The solid line is the calculated values from the combined hadronic and electromagnetic interaction code based on the Ericson approximation, the dashed line is based on the Gaimard-Schmidt approximation, and the dot-dashed line is the electromagnetic contribution.

Figure 5

(Color online) As described in the legend to Fig. 4 but for Ge.

Figure 6

(Color online) As described in the legend to Fig. 4 but for Sn.

Figure 7

(Color online) As described in the legend to Fig. 4 but for W.

Figure 8

(Color online) As described in the legend to Fig. 4 but for Pb.