Flux Limit of Cosmic-Ray Magnetic Monopoles from a Multiply Discriminating Superconducting Detector
M. W. Cromar, A. F. Clark, F. R. Fickett
DOI 10.1103/PhysRevLett.56.2561 · Physical Review Letters
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Abstract
A multiply discriminating, three-loop superconducting monopole detector was operated for 1 yr. During this period 8523 h of data were accumulated. The sensing area averaged over solid angle for trajectories passing through a loop was 178 cm2. With inclusion of double-coincidence events from trajectories passing through the shield but not through a loop, the total sensing area averaged over solid angle was 1195 cm2. No candidate monopole events were observed; this leads to an upper limit on the flux of cosmic-ray magnetic monopoles of 5.0 × 10−12 cm−2 sr−1 s−1 with a 90% confidence level.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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