Phys.Rev.D61:032005,2000 Results of a search for the three neutral charm decays, D0 -> mu e, D0 -> mu
mu, and D0 -> e e, are presented. This study was based on data collected in
Experiment 789 at the ...Fermi National Accelerator Laboratory using 800 GeV/c
proton-Au and proton-Be interactions. No evidence is found for any of the
decays. Upper limits on the branching ratios, at the 90% confidence level, are
obtained.
An IES pulsed power machine has been built at Physics International Company that serves as a prototype demonstration of IES technology that is scaleable to very large TW generators. The prototype ...module utilizes inductive store opening switch technology for the final stage of pulse compression and is capable of driving both electron beam Bremsstrahlung loads or imploding plasma loads. Each module consists of a fast discharge Marx driving a water dielectric transfer capacitor which is command triggered to drive the inductive store section of the machine. The inductive store is discharged into the load using a plasma erosion opening switch. Data demonstrating 22% efficient operation into an electron beam diode load will be presented. The system issues addressing the combining of these modules into a very large pulsed power machine will be discussed.
Results of a search for the three neutral charm decays, D0 -> mu e, D0 -> mu mu, and D0 -> e e, are presented. This study was based on data collected in Experiment 789 at the Fermi National ...Accelerator Laboratory using 800 GeV/c proton-Au and proton-Be interactions. No evidence is found for any of the decays. Upper limits on the branching ratios, at the 90% confidence level, are obtained.
Tuna Habitat Use in the Eastern Pacific Matteson, R S; Boustany, A; Kitagawa, T ...
Eos (Washington, D.C.),
09/2006, Letnik:
87, Številka:
36
Magazine Article
Electronic archival tags were used to study Pacific tuna foraging behavior in waters along the western coast of North America. Between August 2002 and 2005 archival tags were deployed on Pacific ...bluefin tuna, Thunnus orientalis (n = 259), yellowfin tuna, Thunnus albacares (n = 231), and Albacore, Thunnus alalunga (n = 239). Tagging took place off the coast of Baja California, Mexico and in the Southern California Bight in 2002 through 2005. Tagged tunas were caught on rod and reel from sportfishing boats or released from bluefin tuna farming pens along the Baja coast. As of September, 105 bluefin tags (41%), 73 yellowfin tags (30%) and 8 albacore tags (3%) have been recovered. The mean track length for Pacific bluefin, yellowfin and albacore tunas were approximately 357.4 days, 130, and 182 days, respectively. Together, these data provide 49,692 cumulative days of positional data with associated depth, temperature and light measurements at sampling intervals ranging from 4 to 120 seconds. Geographically, peak areas of aggregation for bluefin were centered at 27 and 30N, near Point Conception and Punta Eugenia, while yellowfin tuna distributions were densest further south along the Baja coast with major aggregations at 23 and 25N. Albacore tuna have a wider latitudinal range than bluefin or yellowfin and were found from 23 to 46N along the North American continental shelf . Thus far, regions of highest density of albacore tuna are at 28.5, 30 and 44.5N. Bluefin primarily occurred in waters with temperature below 20C and yellowfin tuna showed an ambient temperature preference for waters above 20C. Individuals of all species spent the majority of time in the top 40 meters of the water column with regular dives to 60m and occasional dives to deeper than 400m. Diel, seasonal and spatial variation in diving behavior are apparent within the data set. A peak in diving activity is consistently seen across all species at dawn and dusk, with daytime diving activity correlated with lunar phase. Further exploration of these data will provide a greater understanding of tuna habitat use along the continental coast.
The development of fast Z-pinch technology at Physics International Company using generators with peak powers ≥ 10 12 W and ∼ 100 ns pulsewidths has produced argon plasmas with T e up to 1-2 keV, and ...n e = 10 20 → 2 × 10 21 /cm 3 from wire arrays and a gas puff technique. Results from gas puff experiments using the 5 TW PITHON generator are described. It is shown that modest extrapolations of the parameters to a deuterium-tritium gas can provide breakeven conditions for a ∼ 10 ns confinement time. The possibilities of an inductively driven plasma implosion with an opening switch operating in vacuum are described.
