News tagged with antimatter
Repulsive gravity as an alternative to dark energy (Part 1: In voids)
(PhysOrg.com) -- When scientists discovered in 1998 that the Universe is expanding at an accelerating rate, the possibility that dark energy could explain the observation was intriguing. But because there ...
Jan 31, 2012 |
4.6 / 5 (49) |
125
|
CERN physicists trap antihydrogen atoms for more than 16 minutes (w/ video)
Trapping antihydrogen atoms at the European Organization for Nuclear Research (CERN) has become so routine that physicists are confident that they can soon begin experiments on this rare antimatter equivalent ...
Jun 05, 2011 |
4.8 / 5 (35) |
85
|
Antimatter gravity could explain Universe's expansion
(PhysOrg.com) -- In 1998, scientists discovered that the Universe is expanding at an accelerating rate. Currently, the most widely accepted explanation for this observation is the presence of an unidentified ...
Apr 13, 2011 |
4.8 / 5 (44) |
266
|
Could the Big Bang have been a quick conversion of antimatter into matter?
(PhysOrg.com) -- Suppose at some point the universe ceases to expand, and instead begins collapsing in on itself (as in the “Big Crunch” scenario), and eventually becomes a supermassive black hole. ...
Jul 19, 2011 |
4.7 / 5 (72) |
170
|
Physicists propose mechanism that explains the origins of both dark matter and 'normal' matter
(PhysOrg.com) -- Through precise cosmological measurements, scientists know that about 4.6% of the energy of the Universe is made of baryonic matter (normal atoms), about 23% is made of dark matter, and the ...
Dec 10, 2010 |
4.3 / 5 (52) |
70
|
Does antimatter weigh more than matter? Lab experiment to find out the answer
Does antimatter behave differently in gravity than matter? Physicists at the University of California, Riverside have set out to determine the answer. Should they find it, it could explain why the universe ...
Jan 26, 2012 |
4.6 / 5 (25) |
343
|
First results from Daya Bay find new kind of neutrino transformation
The Daya Bay Reactor Neutrino Experiment, a multinational collaboration operating in the south of China, today reported the first results of its search for the last, most elusive piece of a long-standing puzzle: ...
Mar 08, 2012 |
4.8 / 5 (20) |
16
|
'Anti-atomic fingerprint': Physicists manipulate anti-hydrogen atoms for the first time (Update)
The ALPHA collaboration at CERN in Geneva has scored another coup on the antimatter front by performing the first-ever spectroscopic measurements of the internal state of the antihydrogen atom. Their results ...
Mar 07, 2012 |
5 / 5 (30) |
2
|
Supercomputing the difference between matter and antimatter
(PhysOrg.com) -- An international collaboration of scientists has reported a landmark calculation of the decay process of a kaon into two pions, using breakthrough techniques on some of the world's fastest ...
Mar 29, 2012 |
4.9 / 5 (12) |
9
|
CERN scientists confine antihydrogen atoms for 1000 seconds
(PhysOrg.com) -- Seventeen minutes may not seem like much, but to physicists working on the Antihydrogen Laser Physics Apparatus (ALPHA) project at the CERN physics complex near Geneva, 1000 seconds is nearly ...
May 04, 2011 |
4.6 / 5 (34) |
39
|
Electron is surprisingly round, say scientists following 10 year study
(PhysOrg.com) -- Scientists at Imperial College London have made the most accurate measurement yet of the shape of the humble electron, finding that it is almost a perfect sphere, in a study published in the ...
May 25, 2011 |
4.7 / 5 (23) |
103
|
Physicists Scrutinize Antimatter in Angels & Demons
(PhysOrg.com) -- Could the Vatican really be destroyed by antimatter stolen from a CERN laboratory? The scheme might work in the plot of Angels & Demons, the most recent Hollywood thriller based on a book ...
May 19, 2009 |
4 / 5 (25) |
18
Antihelium-4: Physicists nab new record for heaviest antimatter
(PhysOrg.com) -- Members of the international STAR collaboration at the Relativistic Heavy Ion Collider -- a particle accelerator used to recreate and study conditions of the early universe at the U.S. Department ...
Apr 24, 2011 |
4.7 / 5 (23) |
11
|
Physicists observe antihelium-4 nucleus, the heaviest antinucleus yet
(PhysOrg.com) -- In 1932, scientists observed the first antimatter particle, a positron (or antielectron). Since then, scientists have observed heavier and heavier states of antimatter: antiprotons and antineutrons ...
Mar 22, 2011 |
4.6 / 5 (17) |
5
|
New way to produce antimatter-containing atom discovered
(PhysOrg.com) -- Physicists at the University of California, Riverside report that they have discovered a new way to create positronium, an exotic and short-lived atom that could help answer what happened ...
Jul 11, 2011 |
4.8 / 5 (19) |
14
|
Antimatter
In particle physics, antimatter is the extension of the concept of the antiparticle to matter, where antimatter is composed of antiparticles in the same way that normal matter is composed of particles. For example, an antielectron (a positron, an electron with a positive charge) and an antiproton (a proton with a negative charge) could form an antihydrogen atom in the same way that an electron and a proton form a normal matter hydrogen atom. Furthermore, mixing matter and antimatter would lead to the annihilation of both in the same way that mixing antiparticles and particles does, thus giving rise to high-energy photons (gamma rays) or other particle–antiparticle pairs.
There is considerable speculation as to why the observable universe is apparently almost entirely matter, whether there exist other places that are almost entirely antimatter instead, and what might be possible if antimatter could be harnessed, but at this time the apparent asymmetry of matter and antimatter in the visible universe is one of the greatest unsolved problems in physics. The process by which this asymmetry between particles and antiparticles developed is called baryogenesis.
For more information about Antimatter, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
