Showing papers by "W. Brückner published in 1994"
TL;DR: A new determination of the nonsinglet structure function is presented, which remains below the simple quark-parton model value of 1/3.
Abstract: We present a new determination of the nonsinglet structure function ${\mathit{F}}_{2}^{\mathit{p}}$ - ${\mathit{F}}_{2}^{\mathit{n}}$ at ${\mathit{Q}}^{2}$=4 ${\mathrm{GeV}}^{2}$ using recently measured values of ${\mathit{F}}_{2}^{\mathit{d}}$ and ${\mathit{F}}_{2}^{\mathit{n}}$/${\mathit{F}}_{2}^{\mathit{p}}$. A new evaluation of the Gottfried sum is given, which remains below the simple quark-parton model value of 1/3.
218 citations
TL;DR: In this paper, the authors studied exclusive ϱ 0 and φ muoproduction on deuterium, carbon and calcium in the kinematic range 2 Q 2 2 and 40 Q 2 dependence of the cross sections, the transverse momentum distributions for the vector mesons, the decay angular distributions and nuclear effects.
68 citations
15 Jan 1994-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, the authors describe the progress made in 1992 towards increasing the vertical electron beam polarization at HERA by using harmonic spin-orbit corrections and beam tuning, and the vertical polarization has been increased from 15% to nearly 60% at a beam energy of 26.7 GeV.
Abstract: This paper describes the progress made in 1992 towards increasing the vertical electron beam polarization at HERA. Utilizing harmonic spin-orbit corrections and beam tuning, the vertical polarization has been increased from 15% to nearly 60% at a beam energy of 26.7 GeV. The long-term reproducibility of the polarization is excellent. Measurements of the build-up time and the energy dependence of the polarization are also described.
51 citations
TL;DR: In this article, the transverse momentum distribution of the J / ψ mesons has been analyzed in the framework of the vector meson dominance model and the radii of Jψ and the ϱ 0 as well as the total J/ ψ - N and ϱ0 - N cross sections were deduced.
30 citations
22 Mar 1994-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, the properties of thin copper and germanium layers in view of their use in microstrip gas chambers were investigated, and it was found that ultra thin GAs with thicknesses of about 100 A provide surface resistivities in the order of 10 11 −10 14 ω/□.
Abstract: We have investigated the properties of thin copper and germanium layers in view of their use in microstrip gas chambers. It was found that ultra thin germanium layers with thicknesses of about 100 A provide surface resistivities in the order of 10 11 –10 14 ω/□. Such layers evaporated onto the microstructure of microstrip gas chambers manufactured on plastic or glass supports lead to a gain stabilization of these detectors up to very high particle fluxes.
18 citations
01 Sep 1994-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this paper, a new silicon strip detector has been designed for the fixed target experiment WA89 at CERN, which provides a fast readout by offering zero-suppressed data extraction on the chip.
Abstract: A new silicon strip detector has been designed for the fixed target experiment WA89 at CERN. The system of about 30 000 channels is equipped with SVX chips and read out via a double buffer into a FASTBUS memory. The detector provides a fast readout by offering zero-suppressed data extraction on the chip. The silicon counters are the largest detectors built on a monocrystal so far in order to achieve good transversal acceptance. Construction and performance during the 1993 data taking run are discussed.
6 citations