Showing papers by "Richard C. Lanza published in 1979"
TL;DR: In this paper, a multi-wire proportional chamber system was built as an area detector for use in x-ray crystallography with Cu K? radiation (1.54A) at CERN.
Abstract: A multiwire proportional chamber system has been built as an area detector for use in x-ray crystallography with Cu K? radiation (1.54A). The chamber, constructed by Charpak and collaborators at CERN, consists of a 10cm thick spherical interaction region with a radial electric field, a transition from spherical to plane geometry and a 50cm × 50cm multiwire proportional chamber and subtends a 90° opening angle. Two dimensional position information is obtained from orthogonal cathode planes using a high speed analog centroid finding technique. Data on spatial and energy resolution as a function of angle and depth of interaction in the spherical drift region using a collimated, pulsed, x-ray source are presented. Ionization loss as a function of drift distance and field and loss due to field shaping grids has also been measured.
11 citations
TL;DR: In this paper, the authors present results on the inclusive distributions of final-state hadrons created in deep-inelastic electron scattering from protons and deuterons, and they find that the charge ratio h/sup +//h/sup -/ is a strong function of Q/sup 2/, x/sub F/, and p/sub T/sup ts2/, with little dependence on s.
Abstract: We present results on the inclusive distributions of final-state hadrons created in deep-inelastic electron scattering from protons and deuterons. Data were taken from all portions of the kinematic range simultaneously in an apparatus which had equal detection efficiency for both charge signs. A subset of the produced hadrons were identified with a threshold-type Cerenkov counter. We find that the charge ratio h/sup +//h/sup -/ is a strong function of Q/sup 2/, x/sub F/, and p/sub T//sup ts2/, with little dependence on s. The ratio of production of h/sup -/ from deuterium to that from hydrogen as a function of phi is flat. The invariant cross section for each charge sign and each target exhibits the seagull effect (a correlation in and ). The value of for data in the range 0.4 < x/sub F/ < 0.85 increases slightly as Q/sup 2/ increases. The exponential dropoff in p/sub T/ for production of protons and kaons is similar to that for pions. The dropoff in x/sub F/ for production of pions shows a definite dependence on Q/sup 2/, but this effect is largely caused by the decay products of the exclusive rho/sup 0/ final state. Finally, f (x/sub F/) for ..pi../sup +/,more » ..pi../sup -/, K/sup +/, K/sup -/, p, and p-bar is presented for each target type.« less
7 citations