Follow Slashdot stories on Twitter


Forgot your password?

Submission 2015 Physics Nobel: Takaaki Kajita, Arthur McDonald for Neutrino work->

Lawrence Bottorff writes: The Nobel Prize in Physics has been awarded to the Japanese Takaaki Kajita and the Canadian Arthur McDonald (72) for evidence that neutrinos have mass. This was announced by the Royal Swedish Academy of Sciences on Tuesday in Stockholm.

"For over half a century we thought that neutrinos have no mass," Nobel jurist Olga Botner said. Neutrinos are extremely small and light particles, most come from the sun. They are very difficult to measure, which is why they are also called ghost particles. Billions of them pass through the human body every second, without that they react with our bodies.

Neutrinos come in three types, called generations. Kajita and McDonanld showed that a neutrino can convert to another independently of its original type. They change their identity regularly.

This phenomenon physicists call neutrino oscillation. It is only possible if neutrinos have mass. By detecting the oscillation of the ghostly particles, this year's prize winners were able to answer the long-standing question whether neutrinos have mass or not.

"This year's award is about state changes of some of the most abundant inhabitants of the universe," said Göran Hansson, Secretary General of the Academy.

"Incredible," was Takaaki Kajitas first comment. Kajita examined the neutrinos at Super-Kamiokande Detector, a massive tank in Japan full of ultrapure water. There he was able to show that neutrinos can change their identity from the atmosphere.

Arthur McDonald showed that neutrinos change their identity on their way from the sun to Earth .

Link to Original Source

Comment Re: ROT13 in the WW-II era.. (Score 1) 67

For Turing, breaking Enigma was only one of his accomplishments. His contributions to the start of the computer age overshadow everything he's done during the war. Welchman's post-war work was more in the shadows.

The BBC did a hour-long documentary on Welchman recently.

With up to 9000 personnel, plus key suppliers like Tommy Flowers and his group at Post Office Research (who built Colossus), and Harold 'Doc' Keen of the British Tabulating Machine Company (who built the bombes), there's plenty of unsung heroes at Bletchley Park.

Comment Re:KISS (Score 1) 86

The big drawback of year.month over major.minor is that year.month gives no indication of the magnitude of changes. Can I install 2015.09 and be certain all of the features I use daily are still there? What's the difference in file format between 2014.06 and this new version?
Now I realize major.minor is not an ironclad guarantee either, but it gets me closer than year.month.

Submission Rosetta's Comet is Actually 2 Comets Glued Together->

astroengine writes: Scientists have solved the mystery of why the comet being studied by Europe’s Rosetta spacecraft is shaped like a rubber duck — it started off as TWO separate comets, a new study shows. Ever since Rosetta sent back pictures of its twin-lobed target more than a year ago, scientists have debated whether the comet, known as 67P/Churyumov-Garasimenko, could be the result of two comets that merged together during the solar system’s early years. The other option is that the so-called “neck region” between 67P’s two lobes experienced some particularly active and still unexplained outgassing over the eons, eroding its more spherical shape into a body that resembles a rubber duck. “Our study rules out the possibility that the comet shape is the outcome of erosion,” planetary scientist Matteo Massironi, with the University of Padova in Italy, wrote in an email to Discovery News. Rather, the neck region is where two independent bodies collided, analysis of high-resolution images taken by the orbiting Rosetta spacecraft shows.
Link to Original Source

What good is a ticket to the good life, if you can't find the entrance?