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Topic: Antineutron


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In the News (Wed 20 Mar 19)

  
  Antineutron - Wikipedia, the free encyclopedia
The antineutron is the antiparticle of the neutron.
In particular, the antineutron consists of two anti-down quarks and one anti-up quark.
The magnetic moment of the antineutron is the opposite of that of the neutron.
en.wikipedia.org /wiki/Antineutron   (203 words)

  
 Fenice   (Site not responding. Last check: 2007-11-03)
It appears that the ratio between neutron and proton form factors in the time-like region is equal or larger than 1 in the explored energy range.
Other interesting results from FENICE concern a new measurement of the J/y branching ratio in neutron + antineutron and of the multihadronic electron/positron annihilation cross section close to the neutron/antineutron threshold.
Dotted lines represent the "star" produced by the interaction of the antineutron, while the neutron is detected by the isolated yellow counter in the low right quadrant.
www.lnf.infn.it /esperimenti/fenice.html   (149 words)

  
 Evidence of existence of antineutron   (Site not responding. Last check: 2007-11-03)
This picture, taken in the Berkeley 30 inch propane bubble chamber in 1958, demonstrates the existence of the antineutron - the antiparticle of the neutron.
The antineutron formed in the process travels an actual distance of 9.5 cm before annihilating in a characteristic `annihilation star' which is consistent with the process
The visible energy released in the star is > 1500 MeV, which is approaching the amount expected when the rest mass of an antineutron and a proton is `converted' into energy.
teachers.web.cern.ch /teachers/archiv/HST2002/Bubblech/an.html   (145 words)

  
 seminar   (Site not responding. Last check: 2007-11-03)
The antineutron momentum, ranging from about 50 to 405 MeV/c, allows for this reaction the (1.88 - 1.92) GeV mass window, suitable for the search of the narrow state.
At low energies, the initial antineutron-proton state is a statistical mixing of S and P waves; moreover, the isospin quantum numbers for the antineutron proton 3pi+ 2pi- 1pi0 annihilation are I=1, G=+, I3=+1.
This state could indeed have a chance to be observed in such a reaction, provided the formation mechanism be the same, and that different components of the isospin 1 multiplet show up in a similar way.
wwwsis.lnf.infn.it /seminars/filippi_sem.htm   (236 words)

  
 Nucleon - Wikipedia, the free encyclopedia
The mean-square charge radius related to the scattering length measured in low energy electron-neutron scattering for the neutron is -0.116 fm
Violation of baryon number conservation may give rise to oscillations between the neutron and antineutron, through processes which change B by two units.
Using free neutrons from nuclear reactors, as well as neutrons bound inside nuclei, the mean time for these transitions is found to be greater than 1.3×10
en.wikipedia.org /?title=Nucleon   (1309 words)

  
 Antimatter
A hypothetical form of matter that is identical to physical matter except that its atoms are composed of antielectrons, antiprotons, and antineutrons.
The only difference between the antiparticles and their normal counterpart is the net charge, everything else is the same...for example, their mass, the propagation of light and sound and gravity, ect (hence why Simfishy said the universe would be completely the same if all the patricles would be replaced by their antipatricles).
You might think in that case that the neutron and antineutron are the same thing, but in fact they arent.
www.physicsforums.com /showthread.php?threadid=40013   (493 words)

  
 Antimatter - Science Fact   (Site not responding. Last check: 2007-11-03)
The detection of the antineutron came 5 years later in 1960.
The next step in testing the symmetry between matter and antimatter was resolved concurrently by CERN and the Brookhaven National Laboratory in 1965 with the creation of the antidueteron.
A deuteron is a nucleus from by a proton and a neutron, the antidueteron was formed by combining an antiproton and an antineutron.
ffden-2.phys.uaf.edu /212_fall2003.web.dir/tyler_freeman/history.htm   (333 words)

  
 Re: Is any connection between dark matter and unmatter?
Smarandache describes two types of "unmatter" in his CERN preprint at (http://cdsweb.cern.ch/search.py?recid=798551&ln=en): the first type "is formed by electrons, protons, and antineutrons;" the second type "is formed by antielectrons, antiprotons, and neutrons".
Smarandache seems to think that protons and antineutrons will bind together and last long enough to form "unmatter unatoms" of the first type with electrons.
Antineutrons are made of antiquarks, two antidown antiquarks and one antiup antiquark.
www.madsci.org /posts/archives/2005-07/1120397918.Ph.r.html   (737 words)

  
 Antimatter: My Term Paper
An antineutron would then have the opposite magnetic moment (the antineutron's north magnetic pole would be in the location of the neutron's south magnetic pole and vice versa).
The antineutron would have the same mass as the antiproton, so the energy needed was available in 1955.
Nonetheless, as the neutron and antineutron would have opposite magnetic moments, a new team of physicists at Berkeley was able to detect the antineutron only 1 year after the antiproton's discovery.
jlovkay.web.wesleyan.edu /antimatr.html   (3547 words)

  
 DESYs KworkQuark - Lexikon: Antineutron
Das Antineutron wurde 1956 entdeckt, ist wie das Neutron elektrisch ungeladen und hat eine Masse, die rund 2000-mal so groß ist wie die des Elektrons.
Das Antineutron wurde 1956 von B. Cork und Team bei der Untersuchung der Wechselwirkungen von Protonen in einem Teilchenbeschleuniger entdeckt.
Das Antineutron gehört zu den Anti-Hadronen und Anti-Baryonen.
www.kworkquark.net /lexikon/antineutron/wissensdurst3.html   (85 words)

  
 Neutron - Wikipedia, the free encyclopedia
See FRONTIERS article, and the experiment's web page.
CPT-symmetry puts strong constraints on the relative properties of particles and antiparticles and, therefore, is open to stringent tests.
The masses of the neutron and antineutron are equal to one part in (9±5)×10
en.wikipedia.org /wiki/Neutrons   (1241 words)

  
 [No title]
The pion has baryon number zero (it is a meson) and the proton has baryon number +1, so the baryon number of the antineutron must be —1.
The pion and the proton each have strangeness zero, so the strangeness of the antineutron must also be zero.
In summary, for the antineutron, (a) q = 0, (b) B = —1, (c) and S = 0.
www.rpi.edu /AFS/home/00/lehmah/public_html/ISM_Word/CH-44.DOC   (2331 words)

  
 Talk:Antimatter - Memory Alpha   (Site not responding. Last check: 2007-11-03)
In 1955, the antiproton was discovered, followed just a few years later by the antineutron in 1959.
The first antideuterion, which is composed of a single antiproton and single antineutron, and is the nucleus of antideuterium, was created in 1965.
A team working at CERN in 1995 was able to combine antideuterions with positrons to form the first antideuterium atoms.
www.memory-alpha.org /en/index.php/Talk:Antimatter   (243 words)

  
 [No title]
As the energy increases, the large angle neutrons (antineutrons) are slower and more spread out in momentum.
I consider a (typical) neutron or antineutron with p of 1.4 GeV/c (beta =0.83) so that a counter at 5m from the interaction point (20 ns flight time) gives a rms lab angular error of 0.6 degrees and a rms error in beta of 0.019.
Can we tell neutrons from antineutrons?: We will be able to for some events, when the deposited energy is larger than the neutron hypothesis kinetic energy.
www.ps.uci.edu /~markm/PEP-N/nnbar.html   (856 words)

  
 Elementary Particles   (Site not responding. Last check: 2007-11-03)
Cork observed The annihilation of an antineutron and a neutron also produces a star-burst of charged pions and photons.
Particles and antiparticles have opposite electrical charge in the case of electrons and protons, but antineutrons, have opposite magnetic moment of neutrons.
The study of matter and forces holding particles together or forces for their transformation into each other is called particle physics If you are interested in this area, a visit of the CERN-European Laboratory for Particle Physics is worth while.
science.uwaterloo.ca /~cchieh/cact/nuclear/particles.html   (454 words)

  
 Particle Mass Ratios, and Similar Geometric Volume Ratios
The average volumetric ratio (last pair of patterns) is the three "large" spheres plus the three "intermediate" size spheres divided by six small spheres.
This volumetric ratio is compared to a mass ratio consisting of the average mass of a proton, antiproton, neutron and antineutron, to the mass of an electron.
((If the neutron and antineutron were ignored, the ratios comparison would be in better agreement.
www.causeeffect.org /articles/particle.html   (1175 words)

  
 www.SternenweltForum.net :: Thema anzeigen - Antineutron oder neutron?   (Site not responding. Last check: 2007-11-03)
Ein Antineutron zerfällt analog dazu in ein Antiproton und ein Positron.
Diese Vernichtung des Antineutrons durch Kollision mit normaler Materie hinterlässt aber charakteristische Zerfallsspuren im Teilchendetektor, an denen die Kernphysiker zeigen können, dass da wirklich Antineutronen existiert haben.
weiß denn jetzt jemand aus welchen quarks ein antineutron besteht?
www.sternenweltforum.net /viewtopic.php?t=48&view=previous   (1567 words)

  
 OEDILF - Word Search
As this poor professor has explained already, the antineutron is the antiparticle of the neutron.
While neutrons are found in all nuclei (except hydrogen) the antineutron is not found in ordinary matter.
The information on this page may not be reproduced in any form without written permission by the.
www.oedilf.com /db/Lim.php?Word=antineutron   (132 words)

  
 Antimatter
The antiproton has the same mass as the proton but carries a negative charge.
The antineutron has opposite magnetic moment to a neutron.
We never meet these antimatter particles in normal life, and that is a good thing, because when matter meets antimatter they annihilate each other and their matter energy is changed into radiation.
www.historyoftheuniverse.com /antimatt.html   (364 words)

  
 Antineutron - Memory Alpha   (Site not responding. Last check: 2007-11-03)
From Memory Alpha, the free Star Trek reference.
An antineutron shares similar properties to that of a neutron however its spin directly opposes that of a normal neutron.
Join our small team and have a big impact on the development of Wikia and the MediaWiki open-source project.
memory-alpha.org /en/wiki/Antineutron   (95 words)

  
 Define matter - a definition from Whatis.com
The electron has an antiparticle twin called a positron, with equal mass but opposite electric charge.
Similarly, the proton has an antimatter twin called an antiproton, and the neutron has an antimatter twin called an antineutron.
If a particle of matter encounters its antiparticle, both are converted entirely to energy according to the above formula, where m is the combined mass of the particle and the antiparticle.
whatis.techtarget.com /definition/0,,sid9_gci865252,00.html   (499 words)

  
 antineutron Comparison Table   (Site not responding. Last check: 2007-11-03)
physical object > natural object > particle > antiparticle > antineutron
Next antiparticle: antiproton Up: antiparticle, baryon, neutral particle, radioactive particle Previous antiparticle: antineutrino
A neutron and antineutron both have the same mass and zero electric charge, but can be differentiated by their interactions: a neutron and an antineutron can annihilate into gamma rays, while two neutrons cannot.
www.site.uottawa.ca:4321 /astronomy/antineutron_table.html   (170 words)

  
 Antineutron
Please look for Antineutron, Cheapest Car Rental Rates and Best Deals On Car Rentals to find more Antineutron information.
And a very good way to recognize them is to put a neutron close to an antineutron and see how they immediately annihilate.
Questions About Physics Is Antineutron the Same as Neutron?
www.antineutron.info   (161 words)

  
 Citebase - Neutron-Antineutron Oscillations
The energy scale where (B-L) violation takes place cannot be predicted by theory and therefore has to be explored by experiments.
Different experimental approaches to searching for (B-L)-violating transition of neutron to antineutron are discussed in this paper.
Most powerful search for neutron to antineutron transitions can be performed in a new reactor-based experiment at HFIR reactor (ORNL) where sensitivity can be >1,000 times higher than in the previous experiments.
citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:hep-ex/0211006   (1206 words)

  
 Citebase - Neutron-antineutron transitions
Citation coverage and analysis is incomplete and hit coverage and analysis is both incomplete and noisy.
Reason of Large Scale Difference of the Results in the Neutron- antineutron Oscillation Problem [ Abstract, Cached PDF ]
We expose a grave drawback hidden in the standard model of neutron-antineutron transitions in a medium.
citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:hep-ph/9504419   (493 words)

  
 antineutron - English-French Dictionary - WordReference.com
We found no French translation for 'antineutron' in our English to French Dictionary.
Or did you want to translate 'antineutron' from French to English?
Forum discussions with the word(s) 'antineutron' in the title:
www.wordreference.com /enfr/antineutron   (41 words)

  
 Zero Degree Experiment   (Site not responding. Last check: 2007-11-03)
The neutral pion and eta spectra can be inferred from the 2-photon events.
Neutral hadron (primarily antineutron) production from 0 to several milliradians at all energies
Lambda plus antilambda production from 0 mrad to angles of several mrad (using V's).
www.fnal.gov /projects/zdp   (418 words)

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