First Results from the Chicago-Fermilab-Michigan Cosmic Ray Magnetic Monopole Detector
The design and performance of a prototype detector with two 60 cm diameter superconducting loops is presented. During one month of data-taking, no candidate events are observed and an upper limit on the flux of cosmic ray magnetic monopoles Fm ≲ 6.9 × 10−11 cm−2 s−1 sr−1 is set. This exposure corresponds to 21 times the original exposure of Cabrera.1 The detector demonstrates the possibility of large, high-ambient-field inductive detectors.
KeywordsCandidate Event Circular Loop Ambient Field Prototype Detector Cylindrical Shield
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- 3.H. Frisch as discussed by C.C. Tsuei in “Magnetic Monopoles,” R.A. Carrigan, Jr. and W.P. Trower, eds., (Plenum Publishing Corp., 1983) pp. 209-11.Google Scholar
- 4.a)This solution is similar to those found independently by the IBM group and the Imperial College group. For IBM see: a) C.D. Tesche, C.C. Chi, C.C. Tsuei and P. Chaudhari, Appl. Phys. Lett. 43, 384 (1983). b) C.C. Tsuei, “Magnetic Mono-poles”, R.A. Carrigan, Jr. and W.P. Trower, eds., (Plenum Publishing Corp., ’83) p. 201. c) C.D. Tesche, to be published in the Proceedings of the Fourth Workshop on Grand Unification, University of Pennsylvania, April 1983. d) C.C. Chi in this volume. For Imperial College see: a) J.G. Park, C.N. Guy, “Inductive Monopole Detectors of Coil-Shield Area Ratio Approximately 1: This Signal Size Distribution” Black-ett Lab., UK-preprint (1982). b) See discussion by C.C. Tsuei in “Magnetic Monopoles” R.A. Carrigan, Jr. and W.P. Trower, eds., (Plenum Publishing Corp., 1983) p. 210-211. c) C.N. Guy and J. Schouten in this volume.ADSCrossRefGoogle Scholar
- 5.The smaller time when both detectors were quiet and taking data is due to the fact that we were instrumenting the detector during much of this running time.Google Scholar