49 research outputs found
Slot allocation schemes for voice and data services in a radio-mobile packet access system
No full textModeling of resources for a third generation cellular communication system: an object-oriented approach
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Pulvermetallurgischer Spritzguss von Niob-Superlegierungen
No full textThe new Metal Injection Molding (MIM) technique utilizes the shaping of plastic injection molding to produce of powder metallurgy parts. After applying a suitable binder, the powder can be processed in an injection molding machine as a highly filled suspension. In a subsequent step, the formed part is debound. Afterwards, the final metal part is solidified by sintering. In the work herewith presented, the MIM process was applied to two Niobium-base superalloys, i.e. C-129-Y and C-3009. (orig.)Available from TIB Hannover: RA 831(2773) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman
Measurement of the lifetime
No full textWe present the measurement of the lifetime of the Omega_c we have performed using three independent data samples from two different decay modes. Using a Sigma- beam of 340 GeV/c we have obtained clean signals for the Omega_c decaying into Xi- K- pi+ pi+ and Omega- pi+ pi- pi+, avoiding topological cuts normally used in charm analysis. The short but measurable lifetime of the Omega_c is demonstrated by a clear enhancement of the signals at short but finite decay lengths. Using a continuous maximum likelihood method we determined the lifetime to be tau(Omega_c) = 55 +13-11(stat) +18-23(syst) fs. This makes the Omega_c the shortest living weakly decaying particle observed so far. The short value of the lifetime confirms the predicted pattern of the charmed baryon lifetimes and demonstrates that the strong interaction plays a vital role in the lifetimes of charmed hadrons.We present the measurement of the lifetime of the Ω c 0 we have performed using three independent data samples from two different decay modes. Using a Σ − beam of 340 GeV c we have obtained clean signals for the Ω c 0 decaying i Ξ − K − π + π + and Ω − π + π − π + , avoiding topological cuts normally used in charm analysis. The short but measurable lifetime of the Ω c 0 is demonstrated by a clear enhancement of the signals at short but finite decay lengths. Using a continuous maximum likelihood method we determined the lifetime to be τ ω c 0 = 55 −11 +13 (stat) −23 +18 (syst) fs. This makes the Ω c 0 the shortest living weakly decaying particle observed so far. The short value of the lifetime comfirms the predicted pattern of the charmed baryon lifetimes and demonstrates that the strong interaction plays a vital role in the lifetimes of charmed hadrons.We present the measurement of the lifetime of the Omega_c we have performed using three independent data samples from two different decay modes. Using a Sigma- beam of 340 GeV/c we have obtained clean signals for the Omega_c decaying into Xi- K- pi+ pi+ and Omega- pi+ pi- pi+, avoiding topological cuts normally used in charm analysis. The short but measurable lifetime of the Omega_c is demonstrated by a clear enhancement of the signals at short but finite decay lengths. Using a continuous maximum likelihood method we determined the lifetime to be tau(Omega_c) = 55 +13-11(stat) +18-23(syst) fs. This makes the Omega_c the shortest living weakly decaying particle observed so far. The short value of the lifetime confirms the predicted pattern of the charmed baryon lifetimes and demonstrates that the strong interaction plays a vital role in the lifetimes of charmed hadrons
Search for the exotic Resonance in 340GeV/c -Nucleus Interactions
No full textWe report on a high statistics search for the resonance in -nucleus collisions at 340GeV/c. No evidence for this resonance is found in our data sample which contains 676000 candidates above background. For the decay channel and the kinematic range 0.150.9 we find a 3 upper limit for the production cross section of 3.1 and 3.5 b per nucleon for reactions with carbon and copper, respectively.We report on a high statistics search for the resonance in -nucleus collisions at 340GeV/c. No evidence for this resonance is found in our data sample which contains 676000 candidates above background. For the decay channel and the kinematic range 0.15<x_F<0.9 we find a 3 upper limit for the production cross section of 3.1 and 3.5 b per nucleon for reactions with carbon and copper, respectively
A measurement of Xi(-) polarization in inclusive production by Sigma(-) of 340 GeV/c in C and Cu targets
No full textWe have measured the polarization of Xi /sup -/ hyperons produced inclusively by a Sigma /sup -/ beam of 340 GeV/c momentum in nuclear targets. From a sample of 880000 identified Xi /sup -/ decays, polarizations were determined in the range 0or=0.3. At fixed values of x/sub F/, its magnitude increases with p/sub t/ to maximum values which reach about 20% at large x/sub F/
Search for the pentaquark candidate (1540) in the hyperon beam experiment WA89
No full textWe report on a high-statistics search for the \t1540 resonance in -nucleus collisions at 340 \gevc1 . No evidence for this resonance was found in our data sample which contains 13 millions decays above background. For the decay channel and the kinematic range 0.05 we find the production cross section to be 0.05 we find the production cross section to be 1.8 b per nucleon at 99% CL
