Mathematics – Probability
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........19j&link_type=abstract
Thesis (PH.D.)--THE UNIVERSITY OF MICHIGAN, 1994.Source: Dissertation Abstracts International, Volume: 56-04, Section: B, page:
Mathematics
Probability
Squid Magnetometer, Meteorite
Scientific paper
We searched for magnetic monopoles trapped in bulk materials via the monopole-image interaction. Lunar rocks, iron ores and other materials were tested in previous experiments. We show that these materials would be expected to have only a very small probability of having trapped monopoles. We think that meteorites are better materials, most importantly, because some of them may have come from the cores of small planets which could have relatively large concentrations of the trapped monopoles. We built a detector based on a superconducting induction coil and a SQUID (Superconducting QUantum Interference Device). It has a room temperature bore, 15 cm in diameter, so that test samples can be passed through directly without any thermal, magnetic or mechanical stress on them. The passage of a magnetic monopole would be detected reliably by the characteristic jump of the persistent current in the superconducting coil. We tested more than 225 kg of bulk materials including 112 kg of meteorites with the detector. The total number of the sample was more than 340. We found no monopole in the samples and conclude the monopole/nucleon ratio of the materials is less than 10^{ -29} with a 90% confidence level. The monopole influx may be as small as 10^{-31} cm^{-2} sr ^{-1} sec^{ -1}, based on the result.
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