Accelerator Data Needed for the Interpretation of High Energy Cosmic Rays
Lawrence W. Jones
University of Michigan

Abstract
The study of cosmic rays with energies above 1000 TeV is important as it is in this energy range that there are apparently changes in their origin, acceleration, and galactic confinement. However, because of their low flux, we are totally dependent on ground-level measurements (e.g. extensive air showers) for their study. The mass numbers and energies of the primary cosmic rays must then be determined using Monte Carlos to simulate the primary interactions and subsequent atmospheric cascades. The problem is that the existing Monte Carlos are primarily based on sub-TeV fixed-target data,and there are great uncertainties and confusions. This talk will review this subject and then discuss the hadron collider data needed to resolve these problems, concluding with a summary of recent European conferences related to these topics.