Subatomic particle
hideIn physics, subatomic particles are the particles composing nucleons and atoms. There are two types of subatomic particles: elementary particles, which are not made of other particles, and composite particles. Particle physics and nuclear physics study these particles and how they interact.
Elementary particles of the Standard Model include:
Composite subatomic particles (such as protons or atomic nuclei) are bound states of two or more elementary particles. For example, a proton is made of two up quarks and one down quark, while the atomic nuclei of helium-4 is composed of two protons and two neutrons. Composite particles include all hadrons. These, in turn, are composed of baryons (e.g., protons and neutrons) and mesons (e.g., pions and kaons).
There are hundreds of known subatomic particles. Most are either the result of cosmic rays interacting with matter, or have been produced by scattering processes in particle accelerators.[citation needed]
For more information about Subatomic particle, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with subatomic particles
Nonlinear thinker: Making sense of previously insoluble problems
Jan 29, 2010 |
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If an airplane is cruising along and raises the flaps on its wings a degree or two, it will tilt upward. If it raises the flaps twice as much, it will tilt upward about twice as much. But if it tilts upward ...
Researchers Detect First Neutrino Events at T2K Facilities in Japan
Jan 19, 2010 |
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(PhysOrg.com) -- Louisiana State University researchers, including graduate and undergraduate students, have been working for several years on an experiment in Japan called T2K, short for Tokai to Kamioka ...
Large Hadron Collider preparing 2010 new science restart
Dec 18, 2009 |
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At its 153rd session today, the CERN Council heard that the Large Hadron Collider (LHC) ended its first full period of operation in style on Wednesday 16 December. Collisions at 2.36TeV recorded since last ...
Crashing the size barrier
Nov 18, 2009 |
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Like surfers on monster waves, electrons can ride waves of plasma to very high energies in a very short distance. Scientists have proven that plasma acceleration works. Now they're developing it as a way to ...
'Big crunch' or another 'Big Bang?'
Aug 16, 2009 |
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Will the universe expand outward for all of eternity and end in a vast, dark, cold, sterile, diffuse nothingness? Or will the “Big Bang” — the gargantuan explosion that formed the universe 14 billion years ...
Particle collider: Black hole or crucial machine?
Aug 07, 2009 |
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(AP) -- When launched to great fanfare nearly a year ago, some feared the Large Hadron Collider would create a black hole that would suck in the world. It turns out the Hadron may be the black hole.
Restart of Large Hadron Collider now November
Jul 30, 2009 |
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(AP) -- Repairs to two small helium leaks in the world's largest atom smasher will delay the restart of the giant machine another month until November, a spokesman for the operator said Thursday.
THEMIS: 'Singing' electrons help create and destroy 'killer' electrons
May 07, 2009 |
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Scientists using NASA's fleet of THEMIS spacecraft have discovered how radio waves produced by electrons injected into Earth's near-space environment both generate and remove high-speed "killer" electrons.
Researchers 'clear away the dust,' get better look at youngest supernova remnant
Apr 22, 2009 |
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(PhysOrg.com) -- Researchers at North Carolina State University have used a mathematical model that allows them to get a clearer picture of the galaxy's youngest supernova remnant by correcting for the distortions caused ...
'Cold fusion' rebirth? New evidence for existence of controversial energy source
Mar 23, 2009 |
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Researchers are reporting compelling new scientific evidence for the existence of low-energy nuclear reactions (LENR), the process once called "cold fusion" that may promise a new source of energy. One group ...
Astrophysicists explore a blazar
Mar 18, 2009 |
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An international team of astrophysicists using telescopes on the ground and in space have uncovered surprising changes in radiation emitted by an active galaxy. The picture that emerges from these first-ever ...
Physicists testing Nobel-winning theory
Nov 13, 2008 |
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(PhysOrg.com) -- Soeren Prell and a team of Iowa State University researchers are part of an international research team testing a theory that led to a share of the 2008 Nobel Prize in Physics for Japanese researchers Makoto ...
