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Published January 31, 1994 | Published
Journal Article Open

Search for Slowly Moving Magnetic Monopoles with the MACRO Detector


A search for slowly moving magnetic monopoles in the cosmic radiation was conducted from October 1989 to November 1991 using the large liquid scintillator detector subsystem of the first supermodule of the MACRO detector at the Gran Sasso underground laboratory. The absence of candidates established an upper limit on the monopole flux of 5.6 × 10^(−15) cm^(−2) sr^(−1) s^(−1) at 90% confidence level in the velocity range of 10^(−4)≲β<4×10^(−3). This result places a new constraint on the abundance of monopoles trapped in our solar system.

Additional Information

© 1994 American Physical Society. Received 21 September 1993. We gratefully acknowledge the Istituto Nazionale di Fisica Nucleare, the Laboratori Nazionali del Gran Sasso, the U.S. Department of Energy, and the U.S. National Science Foundation for their generous support of the MACRO experiment.

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Published - PhysRevLett.72.608.pdf


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August 20, 2023
August 20, 2023