Electromagnetic dissociation ofCo59,Y89, andAu197targets by relativistic heavy ions toZ=26

The electromagnetic dissociation of ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}$, ${}_{}{}^{89}{}_{}{}^{}\mathrm{Y}$, and ${}_{}{}^{197}{}_{}{}^{}\mathrm{Au}$ target nuclei was inferred from measurements of cross sections for the one-neutron removal reaction. Beams of 2.1 GeV/nucleon ${}_{}{}^1{}_{}{}^{}\mathrm{H}$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, and ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$, 1.8 GeV/nucleon ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$, and 1.7 GeV/nucleon ${}_{}{}^{56}{}_{}{}^{}\mathrm{Fe}$ projectiles were used. Beam intensities were monitored using the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(RHI,X${)}^{11}$C reaction, where RHI represents relativistic heavy ion beams. The experimental cross sections in excess of the estimated nuclear contributions are generally well described by use of the Weizsaaumlcker-Williams method for calculating the electromagnetic dissociation contributions but increase more slowly as the projectile charge is increased. Cross sections for one-neutron removal reactions are large for the heavier projectiles, ranging up to 707 mb. For these cases a high percentage is from the electromagnetic dissociation process.