Optimizing the “eyeballs” of the IceCube Neutrino Observatory

Researchers in the IceCube Collaboration are always looking for ways to improve the understanding of the PMTs so they can get the highest-quality data from the DOMs. Most recently, they implemented a new method for more accurately characterizing individual PMT charge distributions, which was shown to improve PMT calibration and simulation. The method is described in a technical report submitted today to the Journal of Instrumentation. […]

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IceCube performs the first-ever search for neutrinos from the sun’s atmosphere

The IceCube Collaboration recently performed the first-ever experimental search for solar atmospheric neutrinos. Such a detection would have important implications for understanding solar magnetic fields and how cosmic rays propagate in the inner solar system, and it could even provide additional background to solar dark matter searches. But after investigating seven years of IceCube data, IceCube researchers did not detect any solar atmospheric neutrinos and so set an upper limit on the flux. Their results are outlined in a paper that was recently submitted to the Journal of Cosmology and Astroparticle Physics. […]

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ANTARES and IceCube combine forces to search for southern sky neutrino sources

The IceCube Collaboration recently conducted a combined IceCube-ANTARES search for neutrino point-like and extended sources in the southern sky. They didn’t find any significant evidence for cosmic neutrino sources, but the analysis shows the strong potential for combining data sets from both experiments. Their results were submitted to The Astrophysical Journal. […]

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IceCube rules out last Standard Model explanation of ANITA’s anomalous neutrino events

IceCube isn’t the only neutrino experiment in Antarctica. There is also the ANITA (the ANtarctic Impulsive Transient Antenna) experiment, which flies a balloon over the continent and points radio antennae toward the ground in search of extremely high-energy neutrinos.

The IceCube Collaboration recently followed up on events detected by ANITA and presented their results in a paper submitted today to The Astrophysical Journal. The collaboration found that these neutrinos could not have come from an intense point source. Other explanations for the anomalous signals—possibly involving exotic physics—need to be considered. […]

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Locally sourced neutrinos? IceCube takes a look

IceCube has not yet found neutrino sources within our galaxy, but there may be sources that are not too much farther out. To test this possibility, the IceCube Collaboration recently performed an analysis scouring the local universe for potential neutrino sources. They conducted two different searches that looked for correlations between neutrino emission and dense regions in a catalog of galaxies called the 2MASS Redshift Survey (2MRS). While they did not find significant sources, they were able to put constraints on neutrino emission from nearby galaxies, which they present in a paper recently submitted to the Journal of Cosmology and Astroparticle Physics. […]

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Putting neutrino masses in their place (soon!) with the IceCube Upgrade and JUNO

Neutrino mass ordering is one of the foremost problems in neutrino physics today. But two new neutrino oscillation experiments are on the horizon—the IceCube Upgrade and JUNO. So the IceCube Collaboration and the JUNO Collaboration studied the combined performance of their respective experiments, which employ very distinct and complementary routes in order to resolve the neutrino mass ordering. In a paper submitted recently to Physical Review D, they show that a combined analysis could eliminate the wrong mass ordering in as few as three years from the start of data taking. […]

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What can cascade events tell us about neutrino sources?

Cascade events are more difficult to reconstruct than tracks, which are usually used in searches for astrophysical neutrino sources, but cascades have their own advantages, including providing a better measurement of neutrino energy. In a paper published in The Astrophysical Journal, the IceCube Collaboration outlined recent results from a source search that used seven years of data from cascade events. While they did not find any statistically significant sources of neutrino emissions, this work is an improvement on the previous source search with cascades. […]

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IceCube and PICO set new constraints on properties of dark matter particles

Dark matter is one of the biggest mysteries in modern astronomy and physics. In a paper recently submitted to the European Physical Journal C, scientists from IceCube and PICO determined new constraints on particle physics properties of dark matter. Though these are less stringent than previous constraints, they take into consideration the latest research on the distribution of dark matter in our galaxy. […]

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