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Topic: Electron antineutrino

Related Topics

Muon antineutrino

Electron neutrino

Lepton

Antiparticle

	The Weak Force: Identity or Number Charge
		(a tau decays to a muon, tau neutrino, and muon antineutrino)
		(a muon decays to an electron, muon neutrino, and electron antineutrino)
		(a neutron decays to a proton, electron, and electron antineutrino)
	www.people.cornell.edu /pages/jag8/identity.html (2686 words)

	Neutrino - Wikipedia, the free encyclopedia
		This effect was first noticed due to the number of electron neutrinos detected from the sun's core failing to match the expected numbers, a discrepancy dubbed the "solar neutrino problem".
		Despite their massive nature, it is still possible that the neutrino and antineutrino are in fact the same particle, a hypothesis first proposed by the Italian physicist Ettore Majorana.
		An electron in the detector produces an electromagnetic shower which can be distinguished from hadronic showers if the granularity of the active detector is small compared to the physical extent of the shower.
	en.wikipedia.org /wiki/Electron_neutrino (3144 words)

	Electron (Site not responding. Last check: 2007-10-29)
		In an atom the electrons surround the nucleus of protons and neutrons in an electron configuration.
		The electron is one of a class of subatomic particles called leptons which are believed to be fundamental particles (that is, they cannot be broken down into smaller constituent parts).
		The antimatter counterpart of the electron is its antiparticle, the positron.
	hallencyclopedia.com /Electron (1464 words)

	Radioactivity
		Beta emission is accompanied by the emission of an electron antineutrino which shares the momentum and energy of the decay.
		Positrons are emitted with the same kind of energy spectrum as electrons in negative beta decay because of the emission of the neutrino.
		Because either a neutrino or an antineutrino is emitted as well, there is a spectrum of energies for the electron or positron, depending upon what fraction of the reaction energy Q is carried by the massive particle.
	hyperphysics.phy-astr.gsu.edu /hbase/nuclear/beta.html (364 words)

	Examples of the use of Feynman vertices to describe processes
		neutron decays to a proton, electron and an anti-electron neutrino
		omega-minus decays to xi-zero, an electron and an electron antineutrino
		This is an annihilation of a positron and an electron.
	teachers.web.cern.ch /teachers/archiv/HST2002/feynman/examples.htm (1005 words)

	New Particle Structure pt. 1
		Despite diverting the bulk of the photon's energy to the electron's composition and stability, the overall effect, therefore, is the 1/137th fraction of the photon's unit of action being amplified by a proportional increase in cyclical time of the electron, and the electric field retaining one unit of action.
		Electrons in an atom are locked into orbit by their wavelength and move in harmony with the electrons of the outer shells.
		The antineutrino is bound to the neutrino from the pion nucleus as a binary.
	www.non-newtonianphysics.com /particle1.htm (6296 words)

	Neutrino (Site not responding. Last check: 2007-10-29)
		This phenomenon, known as neutrino oscillation, explains why there are many fewer electron neutrinos observed from the sun and the upper atmosphere than expected, and has also been directly observed.
		It was the chlorine detector in the former Homestake Mine near Lead, South Dakota, containing 520 short tons (470 metric tons) of fluid, which first detected the deficit of neutrinos from the sun that led to the solar neutrino problem.
		Electrons produce an electromagnetic shower, which is different in shape from a hadronic shower; the two kinds of showers can be separated if the granularity of the active detector is small compared to the size of the shower.
	www.worldhistory.com /wiki/N/Neutrino.htm (2676 words)

	Lepton - Wikipedia, the free encyclopedia
		There are 12 known types of lepton, 3 of which are matter particles (the electron, the muon and the tauon), 3 corresponding neutrinos, and their 6 respective antiparticles.
		All known charged leptons have a single negative or positive electric charge (depending on whether they are particles or antiparticles) and all of the neutrinos and antineutrinos have neutral electric charge.
		In general, the number of leptons of the same type (electrons and electron neutrinos; muons and muon neutrinos; tauons and tau neutrinos) remains the same when particles interact (known as conservation of lepton number).
	en.wikipedia.org /wiki/Lepton (229 words)

	Neutrino
		The neutrino was first postulated in 1931 by Wolfgang Pauli to explain the continuous spectrum of beta decay, the decay of a neutron into a proton and an electron.
		This phenonemnon known as neutrino oscillation explains why there are many fewer electron neutrinos observed from the sun and the upper atmosphere than expected, and has also been directly observed.
		Most of the energy produced in supernovas is radiated away in the form of an inmense burst of neutrinos, which are produced when protons and electrons in the core combine to form neutrons.
	www.brainyencyclopedia.com /encyclopedia/n/ne/neutrino.html (1376 words)

	Antineutrino -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-29)
		An antineutrino is the (Matter consisting of elementary particles that are the antiparticles of those making up normal matter) antimatter equivalent particle of the (An elementary particle with zero charge and zero mass) neutrino.
		There is a hypothesis that the neutrino and the antineutrino are actually the same particle.
		For experimental evidence on this attempts are made to find neutrinoless double (Radioactive decay of an atomic nucleus that is accompanied by the emission of a beta particle) beta decay.
	www.absoluteastronomy.com /encyclopedia/a/an/antineutrino.htm (118 words)

	Search Results for electron - Encyclopædia Britannica
		The number of electrons in the unfilled shells of the atoms determines the families, or groups, in which the elements appear in the table.
		The larger the diameter, the weaker is the attraction of the nucleus on outside electrons.
		Analyzes concepts such as the electron densities of interatomic bonds, the new formulation of quantum mechanics by Feynman and Schwinger, and the Lewis and VSEPR models of electron pairs.
	www.britannica.com /search?query=electron&fuzzy=N&ct=eb&start=8&show=10 (1127 words)

	muon (Site not responding. Last check: 2007-10-29)
		Together with the electron, the tauon and the neutrinos, it is classified as part of the lepton family of fermions.
		He had noticed particles that curved in a manner distinct from that of electrons and other known particles when passed through a magnetic field.
		It was assumed that their electric charge was equal to that of the electron, and so to account for the difference in curvature, it was supposed that these particles were of intermediate mass (lying somewhere between that of an electron and that of a proton).
	www.yourencyclopedia.net /Muon.html (602 words)

	Tauon - Wikpedia (Site not responding. Last check: 2007-10-29)
		It is the counterpart of the electron (1st generation) and the muon (2nd generation).
		Like the electron and muon, the tauon is pointlike; it has no structure that has been detected, and if there is any structure it would have to be on a scale of less than 10
		The branching ratio for the decay of a tauon into an electron and neutrinos is about 18%, and similar for decay into a muon and neutrinos.
	www.bostoncoop.net /~tpryor/wiki/index.php?title=Tauon (434 words)

	The Neutrino (Site not responding. Last check: 2007-10-29)
		The three are the electron neutrino, the muon neutrino and the tau neutrino.
		It was known that the mass of the proton and the electron were to within measurable resolution the same as that of the neutron so this meant that the neutrino must possess very high velocity to balance the equation.
		It seems likely that though the electron neutrino is constrained to very low levels the constraints on the mass of other neutrinos is not as strict, though all would be significantly smaller than that of the proton.
	www.cakes.mcmail.com /StarTrek/neutrino.htm (1294 words)

	GEOPHYSICS: FIRST DETECTION OF GEONEUTRINOS
		Electron antineutrinos are produced in beta-decays of an atomic nucleus that occur, for example, when potassium (40K) is transformed to the calcium isotope 40Ca, and also in the decay series of uranium (U) and thorium (Th).
		Antineutrinos are occasionally captured by protons in KamLAND's 1-kiloton, 13-meter-diameter scintillation detector in a process known as inverse beta-decay.
		The change involves the conversion of a neutron into a proton with the emission of an electron and an electron antineutrino, or of a proton into a neutron with the emission of a positron and an electron* neutrino.
	scienceweek.com /2005/sw050826-1.htm (2255 words)

	Early Cosmic Ray Results (Site not responding. Last check: 2007-10-29)
		The antineutrino which results from pion decay is actually distinct from the antineutrino emitted in nuclear beta decay; it is called the mu antineutrino since it is associated with the muon in the same way that the antineutrino in beta decay is associated with the electron.
		In all respects except mass the muon appears to be identical to the electron.
		Furthermore, as with the electron, it is not subject to the nuclear force.
	www.physics.nmt.edu /~raymond/classes/ph13xbook/node195.html (430 words)

	New Page 1
		An antineutrino is the antiparticle of the neutrino.
		In beta decay the nucleus loses one neutron but gains a proton, while the beta particle, the electron, and the antineutrino are emitted from the nucleus.
		Electron capture occurs when an orbital electron gets too close and is absorbed by the nucleus of an atom.
	home.kc.rr.com /jhlord/Radioactivity.htm (343 words)

	Neutrino Article, Neutrino Information (Site not responding. Last check: 2007-10-29)
		The neutrino was first postulated in 1931 by Wolfgang Pauli to explain the continuous spectrum of betadecay, the decay of a neutron into a proton and an electron.
		The strongest upper limits on the mass of the neutrino come from cosmology.The big bang model predicts that there is a fixed ratio between the number ofneutrinos and the number of photons in the cosmic microwave background.
		Most of the energy producedin supernovas is radiated away in the form of an inmense burst of neutrinos, which are produced when protons and electrons in the core combine to form neutrons.
	www.anoca.org /neutrinos/detectors/neutrino.html (1345 words)

	NIST: Exper. to Measure the Electron-Antineutrino Coefficient (Site not responding. Last check: 2007-10-29)
		Coincidence detection of the electron and proton is possible for neutrons that decay in the indicated decay region.
		Therefore, for any neutron decay where both the electron and proton are detected, the possible antineutrino momenta must fall into one of two kinematically distinct groups, indicated in the figure by the regions labeled I and II.
		The decay electrons have velocities close to the speed of light, and so are detected a few nanoseconds after the neutron decays.
	physics.nist.gov /Divisions/Div846/Gp3/FunPhys/littlea.html (1166 words)

	Beta decay (Site not responding. Last check: 2007-10-29)
		The antineutrino is there to conserve the total number of electrons in the interaction.
		The heavier down-type quarks are the strange and bottom quarks, and the heavier cousins of the electron are the muon and tau.
		Neutrons can only emit electrons and neutrinos because the amount of available energy (given by the mass differnece between the proton and the neutron) is not enough to produce any of the heavier particles.
	van.hep.uiuc.edu /van/qa/section/New_and_Exciting_Physics/Antimatter/20031111114658.htm (391 words)

	Cyberphysics - Leptons (Site not responding. Last check: 2007-10-29)
		The electron is stable because there is no lighter particle into which it can decay.
		Muons are produced by the weak decay of pions into a muon and a muon antineutrino.
		Muons can be substituted for electrons in orbit around the nucleus of an atom; the resulting atom is long-lived enough to exhibit behaviour that further supports the close resemblance between the muon and the electron.
	cyberphysics.pwp.blueyonder.co.uk /topics/physics/particle/lepton.htm (313 words)

	CERN Courier - KamLAND experiment discovers - IOP Publishing - article
		The first results from six months of data-taking by the KamLAND experiment in Japan indicate that electron antineutrinos from distant nuclear reactors are "disappearing" on their way to the detector.
		It is exposed to electron antineutrinos emitted from some 51 nuclear reactors in Japan, plus 18 in South Korea, at a variety of distances.
		KamLAND detects electron antineutrinos through the inverse beta-decay process, in which an electron antineutrino interacts with a proton to create a positron and a neutron.
	www.cerncourier.com /main/article/43/2/5 (392 words)

	Alternative free neutron decay to proton
		Note, the mass of the binding energy is the difference in mass between the neutron and the combined mass of the electron and proton.
		= the electron to be a positron and the W- to a W+ in the Feynman =
		An electron (or muon, positron, etc.) from a pair surrounding the pion becomes the appropiate W (plus appropriate neutrino) that "neutralizes" the quark pair by being absorbed instead of emitted, which leaves the other particle of the pair and a neutrino left over.
	www.pych-one.com /new-5545978-4388.html (6371 words)

	B. Conservation Laws
		For example, it is an observed fact that the total number of electrons plus electron neutrinos minus positrons minus electron antineutrinos in the universe is a constant.
		, the positron and the electron antineutrino are
		Table 5 shows that these two quantum numbers are conserved; that is, the electron and muon number at the beginning is the same as the total of the electron and muon numbers in the final state.
	www-hep.colorado.edu /~nlc/SUSY_Wagner/susy/node7.html (519 words)

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