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Author(s):
J. Uramoto
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Title:
Development of nu_mu Beam Detector and Large Area nu_mu Beam Source by H_2 Gas Discharge (I)
Date of publication:
Mar. 1998
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Key words:
positive pionlike particles pi^+, mu neutrinos nu_mu negative muonlike particles mu^-
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Abstract:
From outside of a H_2 gas discharge in magnetic field, positive pionlike particles pi^+ are extracted in a low voltage (800V) with H^+. H_3^+ ions and are shot into a thick metal plate MP. When the positive ions (above a critical ion energy) are supplied in the opposite side of the metal plate MP, some negative muonlike particles mu^- appear continuously while the energy of mu^- is corresponding to the pi^+ extraction voltage. From the thickness of MP, unknown particles penetrating MP are estimated to be mu neutrinos nu_mu. Thus, a new detector for nu_mu beam are found and a large area nu_mu beam source are produced by opening many apertures over large area extraction electrodes of pi^+ under a sheet discharge of H_2 gas. This large area nu_mu beam source is very important when the nu_mu must be detected after a long distance flight or in a very small current. The positive pionlike particles pi^+ from the H_2 discharge can be concluded to be true positive pions as the characteristics of nu_mu are clarified in this experiment. From other gases except H_2 or D_2 gas, no pionlike or muonlike particles are observed.
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