Cosmic Rays
... Direct Measurement of CR Age Secondary Isotopes with lifetime ~esc can be used to directly measure the age of CR ...
... Direct Measurement of CR Age Secondary Isotopes with lifetime ~esc can be used to directly measure the age of CR ...
Cosmic Extremes
... their charge in the presence of radioactive materials. Thus, in the first decades of the twentieth century, the electroscope became a standard instrument for studying radiation and radioactive materials. However, physicists also found that electroscopes slowly lost their charge under all conditions ...
... their charge in the presence of radioactive materials. Thus, in the first decades of the twentieth century, the electroscope became a standard instrument for studying radiation and radioactive materials. However, physicists also found that electroscopes slowly lost their charge under all conditions ...
Cosmic Rays and Particle Acceleration - Harvard
... For 1 GeV cosmic rays propagating in the ISM (n ∼ 1 cm−3 ), the mean Coulomb collision rate is nσv ∼ 10−19.5 s−1 This corresponds to a 1% chance of a Coulomb collision ...
... For 1 GeV cosmic rays propagating in the ISM (n ∼ 1 cm−3 ), the mean Coulomb collision rate is nσv ∼ 10−19.5 s−1 This corresponds to a 1% chance of a Coulomb collision ...
Cosmic Radiation
... the origin, composition, and propagation of cosmic rays. For reasons of simplicity and space in this article, I have completely ignored a whole area of cosmic ray research involving subatomic particles.These particles are much smaller then elemental nuclei and are often the result of collisions betw ...
... the origin, composition, and propagation of cosmic rays. For reasons of simplicity and space in this article, I have completely ignored a whole area of cosmic ray research involving subatomic particles.These particles are much smaller then elemental nuclei and are often the result of collisions betw ...
THE THEORETICAL INTERPRETATION OF SOME COSMIC RAYS
... investigations of the conductivity of gases. In the 1912 year, Hess discovered that the air ionization increases with increasing height altitudes in comparison with the sea-level. Most of the cosmic rays, both primary and secondary particles must be due to an extra-terrestrial origin radiation. Hess ...
... investigations of the conductivity of gases. In the 1912 year, Hess discovered that the air ionization increases with increasing height altitudes in comparison with the sea-level. Most of the cosmic rays, both primary and secondary particles must be due to an extra-terrestrial origin radiation. Hess ...
Microsoft Word Format - University of Toronto Physics
... result. Setting up and testing the necessary data taking electronics is an important part of the experiment. Cosmic Ray and Muon Physics Cosmic rays, discovered in the 1930's as background radiation in laboratory experiments, provide us with a free source of muons. The flux of muons is not difficult ...
... result. Setting up and testing the necessary data taking electronics is an important part of the experiment. Cosmic Ray and Muon Physics Cosmic rays, discovered in the 1930's as background radiation in laboratory experiments, provide us with a free source of muons. The flux of muons is not difficult ...
What does a spark chamber detect?
... 6: The large electric fields create current flows along the paths of lowest electrical resistance, meaning where the cosmic-ray particle caused ionisation. These current flows are seen as sparks. The spark chamber was developed between the late 1940s and the early 1960s, with contributions from many ...
... 6: The large electric fields create current flows along the paths of lowest electrical resistance, meaning where the cosmic-ray particle caused ionisation. These current flows are seen as sparks. The spark chamber was developed between the late 1940s and the early 1960s, with contributions from many ...
Cosmic Rays
... with a large solar flare. Since that time detectors, set up to monitor cosmic rays, have occasionally seen sudden increases in the intensity of the radiation associated with outbursts on the Sun, mostly with visible flares. The cosmic ray intensity returns to normal within tens of minutes to hou ...
... with a large solar flare. Since that time detectors, set up to monitor cosmic rays, have occasionally seen sudden increases in the intensity of the radiation associated with outbursts on the Sun, mostly with visible flares. The cosmic ray intensity returns to normal within tens of minutes to hou ...
In the 1920s and 1930s, Marietta Blau developed the method of
... tracks were attributed to protons, either the emitted ones or recoil protons from emitted neutrons. Track length and grain density pointed to high energy of the incident particle. ...
... tracks were attributed to protons, either the emitted ones or recoil protons from emitted neutrons. Track length and grain density pointed to high energy of the incident particle. ...
Cosmic rays: the centenary of their discovery
... The problems include: what is the acceleration mechanism beyond 10-3 J, and particularly beyond 10 J, where the particles are almost certainly extragalactic? The impact on other subjects includes the search for new interaction mechanisms above the accelerator energies. Biological effects, including ...
... The problems include: what is the acceleration mechanism beyond 10-3 J, and particularly beyond 10 J, where the particles are almost certainly extragalactic? The impact on other subjects includes the search for new interaction mechanisms above the accelerator energies. Biological effects, including ...
Alessandro Bettini Introduction to Elementary Particle Physics
... Rossi found that cosmic rays have a soft component absorbed by a few cm’s of lead and a hard component that passes through. Question: What is the origin of these components ? ...
... Rossi found that cosmic rays have a soft component absorbed by a few cm’s of lead and a hard component that passes through. Question: What is the origin of these components ? ...
Cosmic Rays - High Energy Physics at Wayne State
... • Muons decay with a mean lifetime of 2.2 μs(mean lifetime = time for an assembly of decaying particles to be reduced by a factor of e) • If a muon is created in the upper atmosphere (e.g. at h = 10 km) does it make it to sea level? • We would expect that even if the muons are traveling at close to ...
... • Muons decay with a mean lifetime of 2.2 μs(mean lifetime = time for an assembly of decaying particles to be reduced by a factor of e) • If a muon is created in the upper atmosphere (e.g. at h = 10 km) does it make it to sea level? • We would expect that even if the muons are traveling at close to ...
Bruno Rossi
Bruno Benedetto Rossi (13 April 1905 – 21 November 1993) was an Italian experimental physicist. He made major contributions to particle physics and the study of cosmic rays. A 1927 graduate of the University of Bologna, he became interested in cosmic rays. To study them, he invented an improved electronic coincidence circuit, and travelled to Eritrea to conduct experiments that showed that cosmic ray intensity from the West was significantly larger than that from the East.Forced to emigrate in October 1938 because of the Italian Racial Laws, Rossi moved to Denmark, where he worked with Niels Bohr, then to Britain, where he worked with Patrick Blackett at the University of Manchester, and finally to the United States, where he worked with Enrico Fermi at the University of Chicago, and later at Cornell University. Rossi stayed in the United States, and became an American Citizen.During World War II, Rossi worked on radar at the MIT Radiation Laboratory, and he played a pivotal role in the Manhattan Project, heading the group at the Los Alamos Laboratory that carried out the RaLa Experiments. After the war, he was recruited by Jerrold Zacharias at MIT, where Rossi continued his pre-war research into cosmic rays.In the 1960s, he pioneered X-ray astronomy and space plasma physics. His instrumentation on Explorer 10 detected the magnetopause, and he initiated the rocket experiments that discovered Scorpius X-1, the first extra-solar source of X-rays.