Magnetic monopole search with the Radio Ice Cherenkov Experiment

We develop a Monte Carlo simulation of relativistic magnetic monopoles and use it to find an upper limit on the flux of relativistic monopoles based on the nonobservation of in-ice showers by the Radio Ice Cherenkov Experiment (RICE). We obtain a 95% C.L. limit of order 10-18(cm2ssr)-1 for intermediate-mass monopoles of 107⩽γ⩽1012107⩽γ⩽1012 at the anticipated energy Etot=1016GeV . This bound is over an order of magnitude stronger than all previously published experimental limits for this kinematic range.