cosmic-ray cascade

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• Cosmic ray — For the film, see Cosmic Ray (film). Cosmic radiation redirects here. For some background types of cosmic radiation, see cosmic background radiation and cosmic background. The energy spectrum for cosmic rays Cosmic rays are energetic charged… …   Wikipedia

• cascade shower — noun : a cosmic ray shower in which a high energy electron produces one or more photons that convert into electrons and positrons, these secondary electrons producing the same effect as the primary, the shower thus building up until the level of… …   Useful english dictionary

• Surface exposure dating — is a collection of geochronological techniques for estimating the length of time that a rock has been exposed at or near Earth s surface. Surface exposure dating is used to date glacial advances and retreats, erosion history, lava flows,… …   Wikipedia

• Air shower (physics) — Cosmic ray air shower created by a 1TeV proton hitting the atmosphere 20 km above the Earth. The shower was simulated using the AIRES package. Animated 3d models of this and other showers can be found on COSMUS. An air shower is an extensive… …   Wikipedia

• radioactivity — /ray dee oh ak tiv i tee/, n. Physics, Chem. the phenomenon, exhibited by and being a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element. Also called activity. [1895… …   Universalium

• radiation — radiational, adj. /ray dee ay sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and… …   Universalium

• Neutron monitor — A neutron monitor is a ground based detector designed to measure the number of high energy charged particles striking the Earth s atmosphere from outer space. For historical reasons the incoming particles are called cosmic rays , but in fact they …   Wikipedia

• Homi J. Bhabha — This page is about the physicist, Homi J. Bhabha. For the postcolonialist theorist, see Homi K. Bhabha. Infobox Scientist box width = 300px name = Homi Jehangir Bhabha image size = 200px caption = Homi Jehangir Bhabha (1909 1966) birth date =… …   Wikipedia

• Milagro (experiment) — Milagro, (the Spanish word for miracle), was a ground based water Čerenkov radiation telescope situated in the Jemez Mountains near Los Alamos, New Mexico at the Fenton Hill Observatory site. It was primarily designed to detect gamma rays but… …   Wikipedia

• Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics       Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity.       Computer scientist Manindra Agrawal of the… …   Universalium

• Dark matter — Not to be confused with antimatter, dark energy, dark fluid or dark flow. For other uses, see Dark Matter (disambiguation) …   Wikipedia