heavy hydrogen

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deuterium

or heavy hydrogen

Isotope of hydrogen, chemical symbol ²H or D, atomic number 1 (but atomic weight approximately 2). Harold C. Urey won a Nobel Prize for its discovery and isolation. Its nucleus contains one proton and one neutron. A stable substance found in naturally occurring hydrogen compounds to the extent of about 0.015%, deuterium can be purified by distillation of hydrogen or by electrolysis of water. It enters into all the same chemical reactions as ordinary hydrogen; it forms D₂ and HD, analogous to molecular hydrogen (H₂), and D₂O (heavy water), analogous to ordinary water (H₂O). Nuclear fusion of deuterium atoms or of deuterium and tritium at high temperatures releases enormous amounts of energy. Such reactions have been used in nuclear weapons and experimental power reactors. Deuterium is useful as a tracer in research into reaction mechanisms and biochemical pathways.

heavy hydrogen [′hev·ē ′hī·drə·jən]

(nuclear physics)

Hydrogen consisting of isotopes whose mass number is greater than one, namely deuterium or tritium.

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No references found			In both sets of experiments, the researchers used chilled acetone in which hydrogen atoms had been replaced by deuterium, or heavy hydrogen, which fuses more readily than ordinary hydrogen does. Once-maligned claim rebounds by Weiss, P. / Science News When the heavy hydrogen atoms hit the tritium atoms, energetic neutrons are released at 14 million electron volts of energy. Fast neutron technology used for explosive detection by Sheehy, Christian / National Defense Most difficult of all the obstacles still to be overcome in developing thermonuclear technology is attainment of the extraordinarily high temperatures and pressures necessary to break the nucleus of hydrogen--100 million degrees Celsius for heavy hydrogen (deuterium-tritium) reactions. On the Threshold of a New Atomic Age by Molitor, Graham T. T. / Association Management			Heaviside unit function Heaviside's expansion theorem Heaviside, Oliver Heaviside-Lorentz system heavy heavy acid Heavy Alloy heavy antiaircraft artillery Heavy Artillery heavy bombardment heavy bomber Heavy Caliber and Superdestructive Artillery heavy chain Heavy Concrete heavy crude heavy cruiser heavy drop heavy ends heavy field artillery heavy floe heavy force fit heavy fraction heavy grading heavy ground heavy howitzer heavy hydrogen heavy ice Heavy Industry heavy ion heavy joist heavy lifting heavy liquid Heavy Machine Building heavy machine gun heavy meromyosin heavy metal heavy mineral heavy naphtha heavy oil heavy oxygen heavy particle heavy resin oil heavy section car heavy soil heavy spar heavy tank Heavy Water heavy weapon heavy wizardry Heavy-Artillery Mortar heavy-bodied paint			heavy ground Heavy Ground Station Module Heavy gun heavy guns Heavy H2O Heavy H2O Heavy H2O Heavy hand Heavy Haul Power International Heavy Haul Truck Network Heavy Heavy Duty Diesel Vehicle Heavy Heavy Low Low Heavy Heavy-Duty Diesel Engine Heavy Heavy-Duty Diesel Truck Heavy Helicopter Heavy High Mobility Multi-Purpose Wheeled Vehicle Heavy High-Density Lipoprotein heavy hitter heavy hitters Heavy Hitters Traffic Net Heavy HMMWV Heavy Hole Exciton Heavy horse Heavy horse heavy horse breeds heavy horse breeds heavy horse breeds heavy horse breeds heavy horse breeds heavy howitzer heavy hydrogen heavy ice Heavy industrial Heavy industrial Heavy industrial Heavy industries Heavy industries Heavy industries Heavy Industries and Public Enterprises Heavy Industries Corporation of Malaysia Heavy Industries Taxila Education City Heavy industry Heavy industry Heavy industry Heavy Industry Training Advisory Committee Heavy infantry fighting vehicle Heavy Infantry Fighting Vehicles Heavy Inspection heavy into heavy ion heavy ion Heavy Ion Accelerator Technology Heavy Ion Analytical Facility Heavy Ion Backscattering Spectrometry Heavy Ion Beam Heavy Ion Beam Probe Heavy Ion Driven Inertial Fusion Heavy Ion Elastic Recoil Detection Heavy Ion Elastic Recoil Detection Analysis Heavy Ion Fusion Heavy Ion Fusion Accelerator Research

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