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BaBar Steadies Omega-minus Spin
Dorfan Today will return next week
Photo of the Day: OIO
Rare Transit of Mercury
Safety Firsts
Monday - November 6, 2006 |
BaBar Steadies Omega-minus SpinIf you snatch a copy of the Particle Data Book from your colleague's back pocket and flip to the entry for the Omega-minus particle, you'll see that the very first line says its spin is "not yet measured." That entry may soon be changed. The BaBar collaboration has established that the spin of the Omega-minus, a particle that was discovered more than 40 years ago, is 3/2. "The Omega-minus has been around for a long time and it's got a very interesting history," says BaBar collaborator Bill Dunwoodie. "It was a confirmation of Murray Gell-Mann's ideas about broken symmetry that led eventually to the quark model." The analysis of BaBar data was primarily conducted by Veronique Ziegler, a graduate student from the University of Iowa, with Dunwoodie. The findings are published in the Sept. 15 issue of Physical Review Letters. Read more... |
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Photo of the Day: |
Rare Transit of MercuryUsually you expect to see planets at night. But in broad daylight on Wednesday, November 8th, the planet Mercury will cross the face of the sun. It will be visible in silhouette through a telescope with a safe solar filter placed securely over the front. Mercury will "transit" the sun for about five hours, looking like a tiny round sunspot creeping westward across the enormous surface of our home star. Transits of Mercury don't happen very often. The last was on May 7, 2003, and the next doesn't come until May 9, 2016. Well-prepared observers will see Mercury edge onto the sun's face around 11:12 a.m. Pacific Standard Time. Watchers in western North America can see the entire transit, which ends when Mercury slips off the sun's edge at 4:10 p.m. Pacific time. Read more... Safety FirstsIf you look at all the injuries suffered by SLAC staff members, you find at least two common patterns. The first is that almost all were engaged in activities that they understood and were quite familiar with. Can you guess the other? |
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