title: Search for magnetic monopoles in polar volcanic rocks.
abstract: For a broad range of values of magnetic monopole mass and charge, the abundance of monopoles trapped inside Earth would be expected to be enhanced in the mantle beneath the geomagnetic poles. A search for magnetic monopoles was conducted using the signature of an induced persistent current following the passage of igneous rock samples through a SQUID-based magnetometer. A total of 24.6 kg of rocks from various selected sites, among which 23.4 kg are mantle-derived rocks from the Arctic and Antarctic areas, was analyzed. No monopoles were found, and a 90% confidence level upper limit of 9.8 × 10(-5)/g is set on the monopole density in the search samples.
authors.affiliation: Fysikum, Stockholm University, SE 106 91 Stockholm, Sweden.
authors.forename: K
authors.initials: K
authors.lastname: Bendtz
authors.affiliation: Fysikum, Stockholm University, SE 106 91 Stockholm, Sweden.
authors.forename: D
authors.initials: D
authors.lastname: Milstead
authors.affiliation: Department of Earth Sciences, Swiss Federal Institute of Technology, 8092 Zurich, Switzerland.
authors.forename: H-P
authors.initials: HP
authors.lastname: Hächler
authors.affiliation: Department of Earth Sciences, Swiss Federal Institute of Technology, 8092 Zurich, Switzerland.
authors.forename: A M
authors.initials: AM
authors.lastname: Hirt
authors.affiliation: Département de Physique Nucléaire et Corpusculaire, University of Geneva, 1211 Geneva, Switzerland.
authors.forename: P
authors.initials: P
authors.lastname: Mermod
authors.affiliation: Department of Geosciences, University of Tulsa, Tulsa, Oklahoma 74104, USA.
authors.forename: P
authors.initials: P
authors.lastname: Michael
authors.affiliation: Department of Physics, Lancaster University, LA1 4YW Lancaster, United Kingdom.
authors.forename: T
authors.initials: T
authors.lastname: Sloan
authors.affiliation: Department of Geoscience, Aarhus University, 8000 Aarhus, Denmark.
authors.forename: C
authors.initials: C
authors.lastname: Tegner
authors.affiliation: Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland, 101 Reykjavik, Iceland.
authors.forename: S B
authors.initials: SB
authors.lastname: Thorarinsson