xenon$92716$ - definizione. Che cos'è xenon$92716$
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Cosa (chi) è xenon$92716$ - definizione

Xeneisol; Xenon-133; Xeon 133; Xenon 133; Xe-133; Xenon-125; Xenon-124; Xenon-134; Xenon-136; Xe-136; Xenon-129; Xenon-126; Xenon-127; Xenon-128; Xenon-130; Xenon-131; Xenon-132; Xenon-110; Xenon-111; Xenon-112; Xenon-113; Xenon-114; Xenon-115; Xenon-116; Xenon-117; Xenon-118; Xenon-119; Xenon-120; Xenon-121; Xenon-122; Xenon-123; Xenon-137; Xenon-138; Xenon-139; Xenon-140; Xenon-141; Xenon-142; Xenon-143; Xenon-144; Xenon-145; Xenon-146; Xenon-147; Xe-134; ATC code V09EX03; ATCvet code QV09EX03; Isotopes of Xenon; Xenon 129; Xenon-109; Xenon-108; Xenon isotope; Xenon radioisotope; Xenon isotopes

Xenon (processor)         
CENTRAL PROCESSING UNIT USED BY XBOX 360 VIDEO GAME CONSOLE
Waternoose; Xenon CPU; XCPU; Xenon processor; XCGPU
Microsoft XCPU, codenamed Xenon, is a CPU used in the Xbox 360 game console, to be used with ATI's Xenos graphics chip.
Xenon (nightclub)         
NIGHTCLUB IN NEW YORK CITY
Xenon (NIGHTCLUB); Xenon Club; Xenon Discothèque
Xenon was a popular New York City discotheque and nightclub in the late 1970s and early 1980s. It was located in the former Henry Miller Theatre at 124 West 43rd Street (now the site of the Stephen Sondheim Theatre) which, prior to Xenon, had been renamed Avon-at-the-Hudson and was operating as a porn house.
Xenon         
  • An acrylic cube specially prepared for element collectors containing liquefied xenon
  • Space Shuttle ''Atlantis'' bathed in xenon lights
  • A layer of solid xenon floating on top of liquid xenon inside a high voltage apparatus.
  • Liquid (featureless) and crystalline solid Xe nanoparticles produced by implanting Xe<sup>+</sup> ions into aluminium at room temperature.
  • animated version]])
  • alt=A model of planar chemical molecule with a blue center atom (Xe) symmetrically bonded to four peripheral atoms (fluorine).
  • alt=A metal cylinder with electrodes attached to its side. Blue diffuse light is coming out of the tube.
  • alt=Elongated glass sphere with two metal rod electrodes inside, facing each other. One electrode is blunt and another is sharpened.
  • alt=Many cubic transparent crystals in a petri dish.
CHEMICAL ELEMENT WITH ATOMIC NUMBER OF 54 AND HEAVIEST STABLE NOBLE GAS
Element 54; Xenon compounds; Xenon anesthesia; Xenon anaesthesia; Xenon chloride lasers; Xenon chloride laser; ATC code N01AX15; ATCvet code QN01AX15; Xenon monofluoride; Xenon gas; Xe (element); History of xenon
Xenon is a chemical element with the symbol Xe and atomic number 54. It is a dense, colorless, odorless noble gas found in Earth's atmosphere in trace amounts.

Wikipedia

Isotopes of xenon

Naturally occurring xenon (54Xe) consists of seven stable isotopes and two very long-lived isotopes. Double electron capture has been observed in 124Xe (half-life 1.8 ± 0.5(stat) ± 0.1(sys) ×1022 years) and double beta decay in 136Xe (half-life 2.165 ± 0.016(stat) ± 0.059(sys) ×1021 years), which are among the longest measured half-lives of all nuclides. The isotopes 126Xe and 134Xe are also predicted to undergo double beta decay, but this has never been observed in these isotopes, so they are considered to be stable. Beyond these stable forms, 32 artificial unstable isotopes and various isomers have been studied, the longest-lived of which is 127Xe with a half-life of 36.345 days. All other isotopes have half-lives less than 12 days, most less than 20 hours. The shortest-lived isotope, 108Xe, has a half-life of 58 μs, and is the heaviest known nuclide with equal numbers of protons and neutrons. Of known isomers, the longest-lived is 131mXe with a half-life of 11.934 days. 129Xe is produced by beta decay of 129I (half-life: 16 million years); 131mXe, 133Xe, 133mXe, and 135Xe are some of the fission products of both 235U and 239Pu, so are used as indicators of nuclear explosions.

The artificial isotope 135Xe is of considerable significance in the operation of nuclear fission reactors. 135Xe has a huge cross section for thermal neutrons, 2.65×106 barns, so it acts as a neutron absorber or "poison" that can slow or stop the chain reaction after a period of operation. This was discovered in the earliest nuclear reactors built by the American Manhattan Project for plutonium production. Because of this effect, designers must make provisions to increase the reactor's reactivity (the number of neutrons per fission that go on to fission other atoms of nuclear fuel) over the initial value needed to start the chain reaction. For the same reason, the fission products produced in a nuclear explosion and a power plant differ significantly as a large share of 135
Xe
will absorb neutrons in a steady state reactor, while basically none of the 135
I
will have had time to decay to Xenon before the explosion of the bomb removes it from the neutron radiation.

Relatively high concentrations of radioactive xenon isotopes are also found emanating from nuclear reactors due to the release of this fission gas from cracked fuel rods or fissioning of uranium in cooling water. The concentrations of these isotopes are still usually low compared to the naturally occurring radioactive noble gas 222Rn.

Because xenon is a tracer for two parent isotopes, Xe isotope ratios in meteorites are a powerful tool for studying the formation of the solar system. The I-Xe method of dating gives the time elapsed between nucleosynthesis and the condensation of a solid object from the solar nebula (xenon being a gas, only that part of it that formed after condensation will be present inside the object). Xenon isotopes are also a powerful tool for understanding terrestrial differentiation. Excess 129Xe found in carbon dioxide well gases from New Mexico was believed to be from the decay of mantle-derived gases soon after Earth's formation. It has been suggested that the isotopic composition of atmospheric xenon fluctuated prior to the GOE before stabilizing, perhaps as a result of the rise in atmospheric O2.