In 1950, with the aid of a cloud chamber that contained lead plates, Ney, together with Charles Critchfield and graduate student Sophie Oleksa, searched for primary cosmic ray electrons.
12.
If the primary cosmic ray that started the cascade has energy over 500 MeV, some of its secondary byproducts ( including neutrons ) will reach ground level where they can be detected by neutron monitors.
13.
:: : Don't high-energy primary cosmic rays, upon first meeting a sitting atom, put most of their kinetic energy into making Cosmic _ ray # Secondary _ cosmic _ rays?
14.
During the years from 1930 to 1945, a wide variety of investigations confirmed that the primary cosmic rays are mostly protons, and the secondary radiation produced in the atmosphere is primarily electrons, photons and muons.
15.
This widely publicized scientific experiment involved the launching of three of the largest balloons ever fabricated, carrying devices to measure and record primary cosmic ray emissions at an altitude of between above the Earth's surface.
16.
Other sources include X-rays from medical radiography examinations and muons, mesons, positrons, neutrons and other particles that constitute the secondary cosmic rays that are produced after primary cosmic rays interact with Earth's atmosphere.
17.
Among the CRD achievements there were : discovery of sharp knee in light components of primary cosmic rays, detection of the highest energy protons accelerated on the Sun, and the creation of the Aragats Space environ�mental Center in 2000 for studies of the solar-terrestrial connection, where CRD becomes one of the world s leaders.
18.
In the 1950s Clark worked with Professor Bruno Rossi and other collaborators on several large cosmic ray air shower experiments that used the novel methods of density sampling and fast timing to measure the energy spectrum of the primary cosmic rays to 1 billion billion ( 10 ^ 18 ) electron volts and to determine the distribution of their celestial arrival directions.
19.
In 1936, the two published a paper, " The Passage of Fast Electrons and the Theory of Cosmic Showers " in the " Proceedings of the Royal Society, Series A ", in which they used their theory to describe how primary cosmic rays from outer space interact with the upper atmosphere to produce particles observed at the ground level.
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