Multielement Proportional Chamber for 136Xe ββ decay

1986 
Abstract A Multielement Proportional Chamber designed to investigate ββ decay of 136 Xe is described. The detector consists of 61 cells. arranged in a honeycomb structure. Each cell is 80 cm long and has a hexagonal cross section of 2.5 cm side. The anodes are 20 μm diameter gold plated tungsten wires. Each cathode consists of 24 copper-beryllium wires of 100 μm diameter. This structure is mounted in a titanium vessel of 40 cm diameter and 110 cm length. In order to obtain a very low background all the materials used were selected for their low intrinsic activities. The detector is operated with Xe at 10 bar; a purification system keeps the oxygen like impurities below 0.2 ppm. The electronics consists of 61 hybrid charge sensitive preamplifiers followed by 7 bit CAMAC flash-ADCs to digitize and store the pulses. An auxiliary output of the preamplifier is used to drive a trigger module that can be preset to any configuration of total energy and/or anode pattern. The chamber, presently under test, will soon be installed in the Gran Sasso underground Laboratory for data taking. Measurements on energy resolution over several cells and on charge transport are described.
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