Electromagnetic dissociation ofSi28atElab/A=14.6 GeV by nucleon emission

Electromagnetic dissociation cross sections for one, two, and three nucleon removal were measured for an ${\mathit{E}}_{\mathrm{lab}}$/A=14.6 GeV ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ beam impinging on ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$, ${}_{}{}^{120}{}_{}{}^{}\mathrm{Sn}$, and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ targets. The measured cross sections exhibit an approximate ${\mathit{Z}}_{\mathit{T}}^2$ dependence and are well reproduced by calculations convoluting the virtual photon spectrum with the experimental σ(γ,N) photonuclear cross sections. Comparison with other experimental results and energy dependence of the cross sections are discussed.