News – Page 87

Searches for time-dependent neutrino sources with IceCube

Posted on March 3, 2015 by Silvia Bravo

Searches with IceCube have so far persistently shown us that more data is needed to reveal the first cosmic ray source. But IceCube researchers are convinced that success also requires a resolute determination to exploit IceCube data in every possible manner. In a new study submitted today to the Astrophysical Journal, the collaboration presents a search for time-dependent astrophysical neutrino sources that did not find any evidence for their existence. The study did however make it possible to set upper limits on the neutrino flux from several source candidates and has proven IceCube’s capabilities for long-term monitoring of sources triggered by multiwavelength information from several experiments. […]

Per Olof Hulth (1943-2015)

Posted on February 27, 2015 by Staff

AMANDA collaborator, first IceCube spokesperson, initiated DeepCore, esteemed colleague and beloved friend. […]

Week 7 at the Pole

Posted on February 26, 2015 by Jean DeMerit

What’s the easiest way to get a nicely centered picture of an approaching airplane on the ice at the South Pole? Have it taxi straight toward you. Here’s the last Herc of the season to arrive at the Pole, just as it came to a stop. […]

Week 6 at the Pole

Posted on February 20, 2015 by Jean DeMerit

The week began with some extra-nice halos and ended with an exodus of most of the summer people at the Pole. In between, there was typical detector maintenance as well as continued snow management around the IceCube Lab. […]

Week 5 at the Pole

Posted on February 16, 2015 by Jean DeMerit

Giant spools sure do serve as a great photo prop. Now empty, these spools had a previous life, brought to the Pole full of cable and ready for action, for use on IceCube and other nearby experiments. But then what to do with them? […]

Measuring the flavor ratio of astrophysical neutrinos

Posted on February 12, 2015 by Silvia Bravo

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In a new measurement of the flavor ratio of astrophysical neutrinos, submitted today to Physical Review Letters, the IceCube Collaboration has found good agreement with the standard source model. The collaboration also sets limits on nonstandard flavor compositions, which could be a signature for new physics in the neutrino sector, such as neutrino decay or sterile neutrinos. […]

Week 4 at the Pole

Posted on February 6, 2015 by Jean DeMerit

Last week we saw a sun halo, and a few weeks back we saw the newly inaugurated South Pole marker. Lo and behold, they have come together. Great shot! […]

Dawn Williams named APS Woman Physicist of the Month

Posted on February 4, 2015 by Silvia Bravo

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Dawn Williams, Associate Professor in the Department of Physics and Astronomy at the University of Alabama in Tuscaloosa, has been named the February Woman Physicist of the Month by APS’s Committee on the Status of Women in Physics. […]

Week 3 at the Pole

Posted on January 30, 2015 by Jean DeMerit

This “ring around the sun” is a halo, an optical phenomenon that occurs from light interacting with ice crystals in the atmosphere. It’s not an uncommon phenomenon, but for those who have never seen one, it’s quite something to behold. Halos can appear around the moon as well as the sun. […]

Week 2 at the Pole

Posted on January 23, 2015 by Jean DeMerit

At first glance it looks like IceCube winterover Stephan has sprouted some new teeth at the Pole. But they’re just ice clumps, not to worry. Stephan got them while he was participating in a half marathon—and out in the extreme cold, with temperatures around -30 °C, this is not an event for the faint of heart. […]