University of Wisconsin | IceCube Neutrino Observatory | 2015 Aug 20
[img3="This photo illustration shows one of the highest-energy neutrino events of this study superimposed on a view of the IceCube Lab (ICL) at the South Pole. Evidence of the neutrinos heralds a new form of astronomy. (Credit: IceCube Collaboration)"]http://news.wisc.edu/story_images/10824 ... Cube_1.jpg[/img3][hr][/hr]Researchers using the IceCube Neutrino Observatory have sorted through the billions of subatomic particles that zip through its frozen cubic-kilometer-sized detector each year to gather powerful new evidence in support of 2013 observations confirming the existence of cosmic neutrinos.
The evidence is important because it heralds a new form of astronomy using neutrinos, the nearly massless high-energy particles generated in nature’s accelerators: black holes, massive exploding stars and the energetic cores of galaxies. In the new study, the detection of 21 ultra high-energy muons — secondary particles created on the very rare occasions when neutrinos interact with other particles —provides independent confirmation of astrophysical neutrinos from our galaxy as well as cosmic neutrinos from sources outside the Milky Way.
The observations were reported today in a paper published in the journal Physical Review Letters by the IceCube Collaboration, which called the data an “unequivocal signal” for astrophysical neutrinos, ultra high-energy particles that have traversed space unimpeded by stars, planets, galaxies, magnetic fields or clouds of interstellar dust — phenomena that, at very high energies, significantly attenuate more mundane particles like photons. ...
Evidence for Astrophysical Muon Neutrinos from the Northern Sky with IceCube - IceCube Collaboration
- Physical Review Letters 115(08) 081102 (20 Aug 2015) DOI: 10.1103/PhysRevLett.115.081102
arXiv.org > astro-ph > arXiv:1507.04005 > 14 Jul 2015
http://asterisk.apod.com/viewtopic.php?t=31418