Experimental Physics

The European Physical Journal C - Particles and Fields

, Volume 25, Issue 4, pp 511-522

First online:

Final results of magnetic monopole searches with the MACRO experiment

  • The MACRO Collaboration
  • , M. Ambrosio et al.Affiliated withDipartimento di Fisica dell'Università di Napoli and INFN, 80125 Napoli, Italy

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We present the final results obtained by the MACRO experiment in the search for GUT magnetic monopoles in the penetrating cosmic radiation, for the range \(4\times 10^{-5}< \beta < 1\). Several searches with all the MACRO sub-detectors (i.e. scintillation counters, limited streamer tubes and nuclear track detectors) were performed, both in stand alone and combined ways. No candidates were detected and a 90% Confidence Level (C.L.) upper limit to the local magnetic monopole flux was set at the level of \(1.4\times 10^{-16}\) cm-2 s-1 sr-1. This result is the first experimental limit obtained in direct searches which is well below the Parker bound in the whole \(\beta\) range in which GUT magnetic monopoles are expected.