The probability of a projectile nucleon to traverse a target nucleus withou
t interaction is calculated for central Si-Pb collisions and compared to th
e data of E814. The calculations are performed in two independent ways, via
Glauber theory and using the transport code UrQMD. For central collisions
Glauber predictions are about 30 to 50% higher than experiment, while the o
utput of UrQMD does not show the experimental peak of beam rapidity particl
es. (C) 2001 Elsevier Science B.V. All rights reserved.