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New Results from Daya Bay – Tracking the Disappearance of Ghostlike Neutrinos

By Guest PostOctober 7, 2013Scienceacrylic vessel, antineutrinos, Beijing, berkeley lab, beta beams, China, daya bay, daya bay collaboration, disappearance, electron, electron neutrinos, evolution of universe, ghostlike neutrinos, hong kong, jim siegrist, kam biu luk, kamland, ling ao, liquid holding, mass hierarchy, mass splitting, millions of quadrillions, minos, muon, neutrino energy, neutrino oscillations, south dakota, steve kettell, super beams, tau, universe

Daya Bay neutrino experiment releases high-precision measurement of subatomic shape shifting and new result on differences among neutrino masses

The international Daya Bay Collaboration has announced new results about the transformations of neutrinos – elusive, ghostlike particles that carry invaluable clues about the makeup of the early universe. The latest findings include the collaboration’s first data on how neutrino oscillation – in which neutrinos mix and change into other “flavors,” or types, as they travel – varies with neutrino energy, allowing the measurement of a key difference in neutrino masses known as mass splitting.

“Understanding the subtle details of neutrino oscillations and other properties of these shape-shifting particles may help resolve some of the deepest mysteries of our universe,” said Jim Siegrist, Associate Director of Science for High Energy Physics at the U.S. Department of Energy (DOE), the primary funder of U.S. participation in Daya Bay. (more…)

The Search for Dark Matter Goes Deeper Underground

By Guest PostMay 28, 2012Scienceacrylic tank, atom, background particles, berkeley lab, bullet cluster, cherenkov radiation, cosmic rays, dan mckinsey, dark matter, davis campus, daya bay project, dimension, electric field, electromagnetism, electron, England, factor, gravitational effect, homestake, kamland, lux, lux collaboration, lux detector, lux zeplin, massive particles, motion of galaxies, neutrino experiment, organic liquid, radioactive decay, rock formation, sanford laboratory, scintillators, search, sno, south dakota, sudbury neutrino observatory, tautology, time projection chamber, titanium tank, underground, wimps, xenon detector, xenon gas, xray emission, yale university, zeplin

With LUX ZEPLIN Berkeley Lab researchers seek to increase the sensitivity of LUX, the most sensitive search for dark matter yet, by orders of magnitude

Although it’s invisible, dark matter accounts for at least 80 percent of the matter in the universe. No one knows what it is, but most scientists would bet on weakly interacting massive particles, or WIMPs.

LUX, the Large Underground Xenon detector at the Sanford Underground Research Facility in the Black Hills of South Dakota, is calling that bet with a titanium bottle holding 350 kilograms of liquid xenon, placed in a cavern 4,850 feet down in the former Homestake gold mine. LUX is a trap set for dark-matter WIMPs. (more…)

Where the Earth’s Heat Comes From

By Guest PostJuly 18, 2011Scienceanti electron, berkeley lab, borexino experiment, brian fujikawa, bse, bulk silicate earth, department of physics, earth crust and mantle, earth interior, earth magnetic field, geo antineutrinos, geologists, geoneutrinos, gran sasso, heat, heat energy, italy, itaru shimizu, Japan, kamioka liquid-scintillator antineutrino detector, kamland, kamland collaboration, ke han, lawrence berkeley national laboratory, lithophiles, muon neutrinos, neutrinos, partial radiogenic heat model for earth, photomultiplier, potassium, radioactive decay of uranium, radioactive isotopes decay, rock loving elements, sea floors, siderophiles, stuart freedman, study antineutrinos, sunken layer, tau neutrinos, thomas banks, thorium, tohoku university, university of california

*Berkeley Lab scientists join their KamLAND colleagues to measure the radioactive sources of Earth’s heat flow*

What spreads the sea floors and moves the continents? What melts iron in the outer core and enables the Earth’s magnetic field? Heat. Geologists have used temperature measurements from more than 20,000 boreholes around the world to estimate that some 44 terawatts (44 trillion watts) of heat continually flow from Earth’s interior into space. Where does it come from?

Radioactive decay of uranium, thorium, and potassium in Earth’s crust and mantle is a principal source, and in 2005 scientists in the KamLAND collaboration, based in Japan, first showed that there was a way to measure the contribution directly. The trick was to catch what KamLAND dubbed geoneutrinos – more precisely, geo-antineutrinos – emitted when radioactive isotopes decay. (KamLAND stands for Kamioka Liquid-scintillator Antineutrino Detector.) (more…)

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New Results from Daya Bay – Tracking the Disappearance of Ghostlike Neutrinos

The Search for Dark Matter Goes Deeper Underground

Where the Earth’s Heat Comes From