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Mass-550 Particle

Physical Review, 1959
At an altitude of 2550 m a search has been carried out for the 550-mass particle which, at the Moscow International Conference in May 1956, was reported to exist with an abundance of 0.5% relative to muons of the same range. Preliminary evidence against this datum is now reinforced by the results of a new series of measurements in which particles ...
G. Torelli   +7 more
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A search for particles of 550 me

Il Nuovo Cimento, 1958
In the experiment reported, mass determinations are essentially based on measurements of energy loss and range. The apparatus for detecting the particles is described. No 550 mass particles were observed in a time interval during which six could have been expected on the basis of their reported abundance.
S. Ratti   +5 more
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Search for Mass-550 Particles

Physical Review Letters, 1958
The apparatus used in the search for cosmic-ray particles of mass ~550m/ sub e/ is described. It is concluded that the abundance of mass-550m/sub e/ particles which decay into a light meson is less than about 0.05% relative to mu mesons.
R. L. Call   +3 more
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