Gerard Stephens

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IceCube has become the first neutrino telescope with a sensitivity below the TeV neutrino flux predicted from gamma-ray bursts if gamma-ray bursts are responsible for the observed cosmic-ray flux above 10(18)  eV. Two separate analyses using the half-complete IceCube detector, one a dedicated search for neutrinos from pγ interactions in the prompt phase of(More)
A search for muon neutrinos from neutralino annihilations in the Sun has been performed with the IceCube 22-string neutrino detector using data collected in 104.3 days of live time in 2007. No excess over the expected atmospheric background has been observed. Upper limits have been obtained on the annihilation rate of captured neutralinos in the Sun and(More)
Point source searches with the IceCube neutrino telescope have been restricted to one hemisphere, due to the exclusive selection of upward going events as a way of rejecting the atmospheric muon background. We show that the region above the horizon can be included by suppressing the background through energy-sensitive cuts. This improves the sensitivity(More)
Transport critical current versus applied field inclination (Jc-/spl thetav/ plots) have been made on a-MoSi thin films in low fields of order 0.04 T. The applied field was rotated (at fixed magnitude) in a plane both parallel (/spl phi/=0/spl deg/) and perpendicular (/spl phi/=90/spl deg/) to the film's longitudinal axis. The results indicate a Jc governed(More)
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