At a South Pole: Searching for extragalactic neutrinos and dim matter in a Antarctic Ice

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Yale University physicists are partial of dual general investigate efforts during a South Pole — a IceCube Collaboration and DM-Ice — that have announced new observations on vast neutrinos and a inlet of dim matter.


Scientists from a IceCube Collaboration have announced new formula on a showing of vast neutrinos. Buried 2,450 meters next a aspect in a Antarctic ice shield, a IceCube examination has rescued muon neutrinos — subatomic particles that transport by a star scarcely composed by other matter — that originated outward a Earth’s galaxy. The regard includes some of a highest-energy neutrinos ever celebrated from a instruction of Earth’s Northern Hemisphere.

The formula have been published in a biography Physical Review Letters.

Neutrinos are never directly observed. IceCube, a gigaton molecule detector located nearby a Amundsen-Scott South Pole Station, observes a by-products of neutrinos that correlate with a Antarctic ice. The detector annals about 100,000 neutrinos each year, many of them constructed by a communication of vast rays with a Earth’s atmosphere. Those interactions also emanate billions of windy neutrinos. In this study, a researchers identified about 10 high-energy neutrinos of vast origin, presumably constructed by massive, bursting stars or black holes elsewhere in a universe.

“The Antarctic Ice during a South Pole is a illusory place to do experiments,” pronounced Reina Maruyama, an partner highbrow of production during Yale and longstanding IceCube collaborator, who was concerned in a construction and commissioning of a IceCube detector. “At that abyss a ice is purify and pure for showing of light from particles ensuing from neutrino interactions. The ice also provides an effective defense from backgrounds for a dim matter search.”

Maruyama is a orator for a approach showing dim matter examination DM-Ice. Located with IceCube in a Antarctic ice shield, DM-Ice aims to detect a annual modulation of a wrongly interacting large molecule (WIMP) dim matter signal. In a paper presented this week during a general TAUP conference,DM-Ice addresses one of a longest-standing claims about a regard of a dim matter vigilance in an progressing experiment, called DAMA.

DM-Ice shows that a annual modulation vigilance is doubtful to be explained by muons combined in a atmosphere and associated instrumental backgrounds. That anticipating brings scientists one step closer to bargain a information constructed by DAMA.

Other DM-Ice collaborators from Yale who contributed to this work embody connoisseur students Walter Pettus, Antonia Hubbard, Zack Pierpoint, postdoctoral researchers Matt Kauer and Kyungeun Lim, and Yale undergraduate students Nikita Dutta and Field Rogers.

IceCube is headquartered during a Wisconsin IceCube Particle Astrophysics Center during a University of Wisconsin-Madison. The general partnership includes 300 physicists and engineers from a United States, Germany, Sweden, Belgium, Switzerland, Japan, Canada, New Zealand, Australia, a United Kingdom, Korea, and Denmark. The growth and research of DM-Ice is led from a Yale Wright Laboratory. DM-Ice has 25 collaborators.

The IceCube Neutrino Observatory and DM-Ice were built with grants from a National Science Foundation and operated with continued support from a NSF, a Alfred P. Sloan Research Foundation, and participating institutions.

Source: Yale University