 | Thursday, August 26, 2004 |
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Thursday, August 26 2:30 p.m. Theoretical Physics Seminar - Curia II Speaker: A. Daleo, Fermilab/Universidad de la Plata Title: Fracture Functions and Higher Order QCD Corrections to Semi-Inclusive DIS 3:30 p.m. DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over THERE WILL BE NO ACCELERATOR PHYSICS AND TECHNOLOGY SEMINAR TODAY
Friday, August 27 |
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Thursday, August 26 Minnesota Wild Rice with Chicken Tuna Melt on Nine Grain $4.75 Breaded Veal with Mushroom Cream Sauce $3.75 Sweet & Sour Pork over Rice $3.75 BLT Ranch Wrap $4.75 Cheesey Breadsticks $1.85 Toasted Pecan Chicken Salad $4.75 Wilson Hall Cafe Menu Chez Leon |
 Chance Thunderstorms 88º/72º
Extended Forecast |
Secon Level 3 |
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Pierre Auger Observatory Reaches Milestones | ||
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The Pierre Auger Observatory collaboration recently celebrated two construction
milestones. Half of the observatory's fluorescence telescopes and one-quarter of
its surface detector stations are now completed and taking cosmic-ray data.
"We are recording lots of beautiful events," said Fermilab's Paul Mantsch, project manager for the observatory. "We see many cosmic-ray showers in both the surface detectors and fluorescence telescopes--a few of them are quite high in energy." The observatory is measuring ultra-high-energy cosmic rays, particles that hit the earth's atmosphere with energies 100 million times higher than the Tevatron produces. The origin of such cosmic rays is a decades-old mystery. "Only 10 to 15 cosmic rays with energies above 1020 eV have been seen," said Mantsch. "We don't know where they come from or how they're made." The cosmic rays collide with an air molecule and produce a shower of up to 100 billion subatomic particles. Fluorescence telescopes detect the ultraviolet light produced as the shower of particles moves through the atmosphere, and surface detectors measure the energies of the particles that reach the earth's surface. The completed observatory will have 1600 surface detector stations placed over an area of about 3000 square kilometers. Four stations containing six fluorescence telescopes each will be located on hills surrounding the surface detector stations. | ||
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From the Daily Herald, August 21, 2004 Student's perfect ACT score no surprise By Lisa Smith Learning she scored a perfect 36 on the ACT didn't surprise Hannah Newfield-Plunkett. After all, the St. Charles East High School honor student also earned a near-perfect 1580 on her SAT and achieved the highest score possible on her advanced placement calculus exam. "We're thrilled but it's just one in a series of successes, so in a way it didn't seem that unusual to us," said her mom, Mady Newfield. "We're utterly thrilled with who she is and what her hopes are." ...In addition to visiting Ivy League campuses, Newfield-Plunkett spent most of the summer working with her father at Fermilab. She served as a member of the famed "neutrino project" team with her father, Rob Plunkett, a physicist and deputy project manager for Neutrinos at the Main Injector, or NuMI.
The project aims to measure the masses involved in the transformation of
the subatomic particles.
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CDF Searches for Magnetic Charge | ||
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Haven't we all played with magnets, arranging them to attract or repel
each other? These forces are caused by the magnet's north and south
poles. Every magnet has two poles; if you break one, each piece still
has two poles.
In 1931, Dirac hypothesized a magnetic monopole, a single north or south pole by itself. We see electric monopoles all the time as negative electrons, but magnetic monopoles have not been discovered. Electricity and magnetism are closely interrelated. Magnetic monopoles would be accelerated by a magnetic field like electrons in an electric field. Monopoles would also be highly ionizing, so to find them, CDF triggers on large light pulses in Time-of-Flight scintillator bars. In the tracking detector, monopoles would cause high energy hits in a pattern resembling a high pT track. A team at CDF searched for magnetic monopoles in 25 pb-1 of data. While none were found, the team determined that monopoles cannot be produced with a cross section (rate) greater than 0.3 pb-1. Furthermore, if they are produced in pairs like electrons--the Drell-Yan mechanism--then monopoles must have a mass greater than 350 GeV. These are currently the world's best limits from a direct search for magnetic monopoles. | ||
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Result of the Week Archive
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Wilson Hall Power Outages - On August 28 and 29, Wilson Hall will have power but no air conditioning. - Power will be out September 13 for half an hour starting at approximately 7:00 a.m. - Power will be out September 24 for half an hour starting at approximately 7:00 a.m. For more information, contact Wilson Hall Building Manager Stan Boyson at x4753.
Booster, CUB, and Cross Gallery Power Outages
Scheduled Downtime for IMAPServer1
New Book Purchase Suggestion Lists
GSA Triathlon Saturday |
