Long-distance drifting of ionization electrons in liquid and solid argon

Details Long-distance drifting of ionization electrons in liquid and solid argon Long-distance drifting of ionization electrons in liquid and solid argon

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ncimc...9..621a&link_type=abstract

(Symposium on Underground Physics, 1st, Saint Vincent, Italy, Apr. 25-28, 1985) Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol.

Physics

2

Argon, Electron Trajectories, Ionization Chambers, Liquefied Gases, Radiation Counters, Solidified Gases, Cosmic Rays, Drift Rate, Solar Neutrinos

Scientific paper

Ionization-electron drift in liquid and solid Ar is investigated experimentally. The experimental apparatus comprises two disc electrodes separated by 10 cm, a screening grid of 50-micron-diameter BeCu wires spaced at 1 mm and located 4 mm from the anode (shielding efficiency 95 percent), a second (alternative) cathode located 1.4 cm behind the anode, and a 13-cm-diameter 15-cm-high stainless-steel container with leak rate less than 10 ntorr 1/2 at liquid-Ar temperature; electric fields of 10-2000 V/cm are applied, and cosmic rays are used as ionizing particles. The results are presented graphically and discussed. The electrons are found to remain free for periods greater than 1 ms, with extrapolated attenuation lengths 75 cm and 1 m for liquid and solid Ar, respectively. The potential use of a larger version of the present device as an underground detector of solar neutrinos is considered.

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