Experimental searches for strange quark matter in cosmic rays

Physics – Nuclear Physics

Scientific paper

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Scientific paper

The results of various cosmic ray experiments are reviewed in order to set limits on the possibility of a cosmic flux of small lumps of strange quark matter (SQM). Large-area detectors, both balloon-borne and space-based, that have been flown to measure elemental abundances of cosmic rays, would be sensitive to relativistic SQM with charge in the atomic range (Z > 6). The absence of cosmic rays with Z/β > 100 leads to good limits on the flux of relativistic and subrelativistic SQM in this range, as there have been several large experiments flown in space that have failed to detect any relativistic particle of such large Z. At lower charge, a few possible candidate events have been seen, and these results will also be reviewed. Finally, various experiments, including space-based, ground-based, and underground detectors, can be used to set limits on the abundance of nuclearites (lumps of SQM that have typical galactic virial velocities ~ 250 km/sec).

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