Gamma

The GAMMA experiment is a study of: *Primary cosmic ray energy spectra and elemental composition (abundances of the elements) at energies 10 15 –10 18 eV (so called knee energy region) *Galactic diffuse gamma-ray intensity at energies 10 14 –10 15 eV *Extensive Air Showers (EAS) at the mountain level by the ground-based EAS array and underground muon scintillation counters *Hard jets production at energies ~10 16 eV by the muon multi-core shower events The GAMMA experiment is deployed on the South side of Mount Aragats in Armenia (Cosmic-ray observatory) and operated by the Cosmic Ray Division of the Yerevan Physics Institute. The facility consists of a ground-based extensive air shower (EAS) array of 33 surface detection stations and 150 underground muon detectors. The elevation of the GAMMA facility is 3200 m above sea level, which corresponds to about 700 g/cm 2 of atmospheric depth. The surface stations of the EAS array are arranged in 5 concentric circles of 20, 28, 50, 70, and 100 m radii, and each station contains 3 plastic scintillation detectors with the dimensions of 1 m × 1 m × 0.05 m. 9 central detector stations contain an additional small scintillator with dimensions 0.3 m × 0.3 m × 0.05 m for high particle density (much greater than 100 particles/m 2 ) measurements. A photomultiplier tube is placed on the top of the aluminum casing covering each scintillator.…

Gamma ( ; uppercase , lowercase ; ) is the third letter of the Greek alphabet. In the system of Greek numerals it has a value of 3. In Ancient Greek, the letter gamma represented a voiced velar stop . In Modern Greek, this letter normally represents a voiced velar fricative , except before either of the two front vowels (/e/, /i/), where it represents a voiced palatal fricative ; while /g/ in foreign words is instead commonly transcribed as γκ). In the International Phonetic Alphabet and other modern Latin-alphabet based phonetic notations, it represents the voiced velar fricative. ==History== The Greek letter Gamma Γ is a grapheme derived from the Phoenician letter (gīml) which was rotated from the right-to-left script of Canaanite to accommodate the Greek language's writing system of left-to-right. The Canaanite grapheme represented the /g/ phoneme in the Canaanite language, and as such is cognate with gimel ג of the Hebrew alphabet. Based on its name, the letter has been interpreted as an abstract representation of a camel's neck, but this has been criticized as contrived, and it is more likely that the letter is derived from an Egyptian hieroglyph representing a club or throwing stick. with a lambda-shaped gamma In Archaic Greece, the shape of gamma was closer to a classical lambda (Λ), while lambda retained the Phoenician L-shape ( ). Letters that arose from the Greek gamma include Etruscan (Old Italic) 𐌂, Roman C and G, Runic kaunan , Gothic geuua , the Coptic Ⲅ, and the Cyrillic letters Г and Ґ. ==Greek phoneme== The Ancient Greek /g/ phoneme was the voiced velar stop, continuing the reconstructed proto-Indo-European *g, *ǵ. The modern Greek phoneme represented by gamma is realized either as a voiced palatal fricative ( ) before a front vowel (/e/, /i/), or as a voiced velar fricative in all other environments. Both in Ancient and in Modern Greek, before other velar consonants (κ, χ, ξ – that is, k, kh, ks), gamma represents a velar nasal . A double gamma γγ (e.g., άγγελος, "angel") represents the sequence (phonetically varying ) or . ==Phonetic transcription== Lowercase Greek gamma is used in the Americanist phonetic notation and Uralic Phonetic Alphabet to indicate voiced consonants. The gamma was also added to the Latin alphabet, as Latin gamma, in the following forms: majuscule Ɣ, minuscule ɣ, and superscript modifier letter ˠ. In the International Phonetic Alphabet the minuscule letter is used to represent a voiced velar fricative and the superscript modifier letter is used to represent velarization. It is not to be confused with the character , which looks like a lowercase Latin gamma that lies above the baseline rather than crossing, and which represents the close-mid back unrounded vowel. It is as a full-fledged majuscule and minuscule letter in the alphabets of some of languages of Africa such as Dagbani, Dinka, Kabye, and Ewe, and Berber languages using the Berber Latin alphabet. It is sometimes also used in the romanization of Pashto. ==Mathematics and science== ===Lowercase=== The lowercase letter \gamma is used as a symbol for: Chromatic number of in graph theory Gamma radiation in nuclear physics Shear strain in physics Surface tension in physics The photon, the elementary particle of light and other electromagnetic radiation The 434 nm spectral line in the Balmer series Surface energy in materials science The Lorentz factor in the theory of relativity In mathematics, the lower incomplete gamma function The heat capacity ratio in thermodynamics The activity coefficient in thermodynamics The gyromagnetic ratio in electromagnetism Gamma waves in neuroscience Gamma motor neurons in neuroscience A non-SI metric unit of measure of mass equal to one microgram (1 μg). This always-rare use is deprecated. A non-SI unit of measure of magnetic flux density, sometimes used in geophysics, equal to 10 −5 gauss (G), or 1 nanotesla (nT). The power by which the luminance of an image is increased in gamma correction In civil and mechanical engineering: Specific weight The shear rate of a fluid is represented by a lowercase gamma with a dot above it: \dot \gamma Austenite (also known as γ-iron), a metallic non-magnetic allotrope or solid solution of iron. The gamma carbon, the third carbon attached to a functional group in organic chemistry and biochemistry; see Alpha and beta carbon Hermite constant The Euler’s Constant also known as Euler–Mascheroni constant ≈ 0.57721566490153286 Stieltjes constants Chvátal–Sankoff constants The lowercase Latin gamma ɣ can also be used in contexts (such as chemical or molecule nomenclature) where gamma must not be confused with the letter y, which can occur in some computer typefaces. ===Uppercase=== The uppercase letter \Gamma is used as a symbol for: In mathematics, the gamma function (usually written as \Gamma -function) is an extension of the factorial to complex numbers In mathematics, the upper incomplete gamma function The Christoffel symbols in differential geometry In probability theory and statistics, the gamma distribution is a two-parameter family of continuous probability distributions. In solid-state physics, the center of the Brillouin zone In NMR and quantum information science, relaxation rates of a two-state quantum system or a quantum bit Circulation in fluid mechanics As reflection coefficient in physics and electrical engineering The tape alphabet of a Turing machine The Feferman–Schütte ordinal \Gamma_0 Congruence subgroups of the modular group of other arithmetic groups One of the Greeks in mathematical finance ==Music== In Medieval music theory, Gamma was the starting note of the musical scale using the Guidonian hand. Paired with the Solfège syllable ut, it became the origin for the word "gamut" ("Gamma ut"). ==Unicode== ==See also== Г, г - Ge (Cyrillic) C, c - Latin G, g - Latin Gamma correction List of storms named Gamma ==References==

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