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Published 1993 | Published
Book Section - Chapter Open

High-Altitude Time-of-Flight Search for Non-Weakly Interacting Dark Matter in Cosmic Rays


Supermassive electrically- or strongly-charged particles might constitute the missing matter in the galaxy. These particles would be non-relativistic, but nevertheless if these hypothetical particles have high enough mass, they might have enough momentum to be detectable below 5 g/cm^2 of atmosphere. We apply the time-of-flight technique to search for these hypothetical slow-moving, supermassive, highly-interacting particles at balloon altitude. We present un-cut histograms and a scatterplot of actual flight data, showing that we can account for most of the events as accidental coincidences. We can reject most (if not all) of these accidental coincidences by requiring a 4-counter coincidence, and by requiring very small changes in velocity in the interior detectors.

Additional Information

Copyright University of Calgary. Provided by the NASA Astrophysics Data System. We would like to thank T. Metcalfe, P. Halverson, R. Norton, A. Pifer, L.Russo, J. Pando, R. Hall, D. Righter, R. Park, G. Albritton, S. Holder, M. Simon, 0. Reimer, W. Menn, B.Kimbell, R. Golden, and "Max" for their assistance in preparing for the balloon flight, and the University of Arizona Experimental Elementary Particles Group for access to their more-than-adequate VAX-cluster for post-flight data analysis. A U.S. Dept. of Education/NSF fellowship supported P. McGuire for much of the pre-flight preparations. This work is also supported by NSF Grant 91-21427.

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August 20, 2023
October 18, 2023