Anomalies in the Nuclear Dissociation Cross Sections of208Pbat 33 TeV

We have measured total nuclear disintegration cross sections for {sup 208}Pb ions at 33TeV (160-GeV A) colliding with C, Si, Cu, Sn, and Pb. Using well established theory, we calculate the nuclear electromagnetic, electron electromagnetic, and the hadronic contributions and find that their sum underestimates the measured cross sections. An additive correction term linear in target Z{sub T} (i.e., 120Z{sub T} mb ) is necessary to bring agreement between theory and experiment. The source of this additional term is unknown. {copyright} {ital 1997} {ital The American Physical Society}