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	Glossary Item - Beta Decay
		During beta-minus decay, a neutron in an atom's nucleus turns into a proton, an electron and an antineutrino.
		For example, after undergoing beta-minus decay, an atom of carbon (with 6 protons) becomes an atom of nitrogen (with 7 protons).
		During beta-plus decay, a proton in an atom's nucleus turns into a neutron, a positron and a neutrino.
	education.jlab.org /glossary/betadecay.html (198 words)

	Beta decay - Wikipedia, the free encyclopedia
		In nuclear physics, beta decay is a type of radioactive decay in which a beta particle (an electron or a positron) is emitted.
		In some nuclei, beta decay is energetically prevented, and in some of these cases the nuclei may undergo double beta decay.
		Beta decay can be considered as a perturbation as described in quantum mechanics, and thus follow Fermi's Golden Rule.
	en.wikipedia.org /wiki/Beta_decay (382 words)

	Station Information - Beta decay
		Beta decay is a type of radioactive decay in which a beta particle (an electron or a positron) is emitted.
		In beta minus decay, a neutron is converted to a proton via the weak nuclear force and a beta particle (an electron) and an anti-neutrino are emitted.
		In beta plus decay, a proton is converted to a neutron via the weak nuclear force and a beta minus particle (a positron) and a neutrino are emitted.
	www.stationinformation.com /encyclopedia/b/be/beta_decay.html (209 words)

	Beta Decay
		Beta decay occurs when, in a nucleus with too many protons or too many neutrons, one of the protons or neutrons is transformed into the other.
		Proton decay, neutron decay, and electron capture are three ways in which protons can be changed into neutrons or vice-versa; in each decay there is a change in the atomic number, so that the parent and daughter atoms are different elements.
		In beta decay the change in binding energy appears as the mass energy and kinetic energy of the beta particle, the energy of the neutrino, and the kinetic energy of the recoiling daughter nucleus.
	www.lbl.gov /abc/wallchart/chapters/03/2.html (445 words)

	Beta decay
		In the case of electron emission, it is referred to as "beta minus", in the case of a positron, "beta plus".
		In beta minus decay, a neutron is converted to a proton via the weak nuclear force and a beta particle (an electron) and a neutrino are emitted.
		Beta decay was first studied by Enrico Fermi.
	www.ebroadcast.com.au /lookup/encyclopedia/be/Beta-decay.html (117 words)

	BETA DECAY FACTS AND INFORMATION (Site not responding. Last check: 2007-10-17)
		In nuclear_physics, beta decay is a type of radioactive decay in which a beta_particle (an electron or a positron) is emitted.
		This was in apparent contradiction to the law_of_conservation_of_energy, as it appeared that energy was lost in the beta decay process.
		In some nuclei, beta decay is energetically prevented, and in some of these cases the nuclei may undergo double_beta_decay.
	www.redabacus.com /beta_decay (350 words)

	TrekWars - The Furry Conflict: Beta Decay
		Beta decay is a type of radioactive decay in which a beta particle (a high energy electron or a positron) is emitted.
		In the case of electron emission, it is referred to as beta minus decay; in the case of a positron beta plus decay.
		In beta minus decay, a neutron is converted to a proton via the weak nuclear force and a beta particle and a neutrino are emitted.
	www.furryconflict.com /tech/technopedia/technology/physics/radiation/beta_decay.html (148 words)

	Beta decay -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-17)
		decay, a proton is converted into a neutron, a (An elementary particle with positive charge; interaction of a positron and an electron results in annihilation) positron and a (An elementary particle with zero charge and zero mass) neutrino:
		Historically, the study of beta decay provided the first physical evidence of the (An elementary particle with zero charge and zero mass) neutrino.
		The Beta decay can be considered as a perturbation as described in quantum mechanics, and thus follow (Click link for more info and facts about Fermi's Golden Rule) Fermi's Golden Rule.
	www.absoluteastronomy.com /encyclopedia/b/be/beta_decay.htm (383 words)

	Nuclides 2000: About Radiactive Decay (Site not responding. Last check: 2007-10-17)
		With this decay mode, the mass of the resulting nuclide is 4 units less and the atomic number is 2 units less than from the parent nuclide.
		Beta decay is also accompanied by the emission of a neutrino following conversion of a neutron to a proton.
		Beta-plus (ß+) decay: In beta-plus decay, a nuclide emits a positron and a neutrino (formed by the conversion of a proton to a neutron).
	www.nuclides.net /Applets/about_radioactive_decay.htm (769 words)

	Radioactivity
		Radioactive decay is the emission of some particle from an atomic nucleus, accompanied by a change of state or type of the nucleus, depending on the type of radioactivity.
		Beta minus decay is the conversion of a neutron into a proton, an electron, and an electron antineutrino.
		The latter are needed because the alpha decays create nuclei with too low a ratio of protons to neutrons relative to the line of stability, as illustrated in figure 21.6.
	www.physics.nmt.edu /~raymond/classes/ph13xbook/node221.html (647 words)

	Atoms - the inside story. Decay equations. (Site not responding. Last check: 2007-10-17)
		Beta minus emitters are therefore on the left of the line of stability.
		Therefore, beta plus decay happens to nuclei on the right of the line (those with too few neutrons to be stable).
		In radioactive decay, the daughter nucleus might be created in an excited state (similar to the excited states of atoms that lead to them giving out visible and near visible light).
	www.schoolscience.co.uk /content/5/physics/particles/partich2pg4.html (1035 words)

	Theory: Radioactive Decay
		It emerges from a weak decay process in which one of the neutrons inside an atom decays to produce a proton, the beta electron and an anti-electron-type neutrino.
		Alpha decay is also a type of fission, common because the alpha particle is a particularly low energy arrangement of two protons and two neutrons.
		Beta decay and gamma decay often occur as steps in a chain of radioactive decays that begins with the fission of some heavy element.
	www2.slac.stanford.edu /vvc/theory/nuclearstability.html (694 words)

	[No title]
		Radioactivity is the spontaneous decay or disintegration of an unstable nucleus, usually accompanied by the emission of ionizing radiation.
		Since the decay of a particular atom is actually a totally random event, only the probability of an atom decaying in a time interval t can be predicted.
		Gamma decay is not traceable on the chart of the nuclides, since the nuclide stays the same.
	weblaunch.org /Nuclear/radioactivity.html (551 words)

	Clefs CEA n° 45 The decay of heavy nuclei and the resulting radiation (Site not responding. Last check: 2007-10-17)
		The half-life of the decay depends on the initial excitation, with higher excitations resulting in a shorter half-life and vice-versa.
		There are six main decay modes that can result in the creation of a nuclide of atomic number Z and mass number A.
		Beta emission (b) is the most common decay mode as all nuclei outside the valley of stability are b emitters.
	www.cea.fr /gb/publications/Clefs45/clefs45gb/clefs4511a.html (629 words)

	Radioactive Decay (Site not responding. Last check: 2007-10-17)
		In some cases, decay by beta emission results in a daughter nucleus that is in an excited state.
		decay, it is an isobaric decay mode and the parent and daughter are different chemical elements.
		In this decay, a proton is converted to a neutron plus a positron, thus, decreasing the atomic number of the daughter nuclide by 1.
	www.bh.rmit.edu.au /mrs/kpm/mr212/modes.html (1358 words)

	Decay Chain Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-10-17)
		Because of this, most radioactive substances do not decay directly to a stable state, but rather undergo a series of decays until eventually a stable isotope is reached.
		In practice there are only three common modes of radioactive decay: alpha decay, beta minus decay, and beta plus decay.
		Three main decay chains are observed in nature, commonly called the uranium series, the thorium series, and the actinium series, representing three of these four classes, and ending in three different, stable isotopes of lead.
	www.karr.net /encyclopedia/Decay_chain (409 words)

	Beta decay (Site not responding. Last check: 2007-10-17)
		indirect observations of two-neutrino double- beta decay came from recent geochemical studies of...
		to trace the paths of the two beta particles released during a decay event and to compute their energies...
		Radioactive decay processes Alpha decay * Beta decay * Electron capture * Gamma radiation * Neutron emission * Positron emission * Proton emission * Spontaneous fission
	hallencyclopedia.com /Beta_decay (583 words)

	Atoms - the inside story. The leptons. (Site not responding. Last check: 2007-10-17)
		In the 1920s and 1930s, it was known that beta decay was not straightforward.
		This decay should release a fixed amount of energy which would be shared between the proton and the electron.
		It decays with a half-life of 2 microseconds (2 millionths of a second).
	www.schoolscience.co.uk /content/5/physics/particles/partich3pg2.html (902 words)

	Re: half-life of a radioactive substance really a 'constant'?
		For alpha and gamma decay, the half-life is a constant.
		For beta decay, which includes beta-minus (electron) decay, positron decay, and electron capture, it is possible to effect changes in the half life of radionuclides decaying by electron capture.
		This has the same effect as beta minus (electron) decay; decreasing the atomic number by 1 and leaving the mass number unchanged.
	www.madsci.org /posts/archives/2004-07/1089918724.Ph.r.html (340 words)

	Types of Nuclear Decay:Beta Minus (Site not responding. Last check: 2007-10-17)
		The progeny nucleus and the beta particle are less than the mass of the parent nucleus; thus, the beta particles emitted should have the energy equivalent to the mass lost.
		The emission of beta particles is accompanied by a virtually massless and changeless particle called a neutrino whose kinetic energy makes up the remaining energy difference.
		Beta minus decay will result in a progeny nucleus that has the same atomic mass (A) as the parent, but the atomic number (Z) will be higher by one unit.
	www.rstp.uwaterloo.ca /manual/radiation/types/beta_minus.htm (168 words)

	Read about Beta decay at WorldVillage Encyclopedia. Research Beta decay and learn about Beta decay here! (Site not responding. Last check: 2007-10-17)
		nuclear physics, beta decay (sometimes called neutron decay) is a type of
		Wolfgang Pauli proposed that the "missing" energy was actually carried away by another yet undiscovered particle — the neutrino.
		The Beta decay can be considered as a perturbation as described in quantum mechanics, and thus follow
	encyclopedia.worldvillage.com /s/b/Beta_decay (202 words)

	Nuclear physics
		The second isotop of hydrogen is deutrium with one proton and one neutron in his atomic nucleus and the third isotop is tritium which has got one proton and two neutrons in his atomic nucleus.
		The one is the beta minus decay and the other is the beta plus decay.
		A gamma decay can happen after an alpha decay or a beta decay, because the atomic nucleus is very energitif.
	www.hpwt.de /Kern2e.htm (1674 words)

	Beta decay - Physics Help and Math Help - Physics Forums
		Also, keep in mind that negative beta decay (neutron ---> proton) is a particle decay mode while the positive beta decay (proton --> neutron) is a nuclear decay mode because the neutron is more heavy then the proton.
		So, indeed, beta decay can and does create an ion -- an ion really does not care where it came from -- the lifetime of which can vary considerably, dependent as it is on the environment of the nucleus.
		Normally when computing beta decay probabilities, we use a standard scattering theory approach in which the electron and neutrino are in their asymptotic out state, as in plane waves.
	www.physicsforums.com /showthread.php?t=66287 (1950 words)

	Radioimmunotherapy Agents: What They Are and How They Work
		The issue of radioactive decay is important because it is the mechanism by which the antibody is visualized when it is a gamma ray, and is the means by which the therapeutic potential of the isotope is realized through either an alpha-meter or a beta-meter.
		This report discusses, for the most part, beta decay, because that is the type of treatment that is associated with radioimmunotherapy.
		In beta decay, a neutron inside the nucleus of an atom breaks down and changes to a proton, emits an electron, and then the atomic number goes up by one and the mass number remains unchanged.
	www.bloodline.net /rinhl/wiseman-r (1841 words)

	Radioactive Decay (Site not responding. Last check: 2007-10-17)
		A brilliant Italian physicist, Enrico Fermi, developed a theory of beta decay and his theory predicted that positively-charged, as well as negatively-charged, electrons could be emitted by unstable nuclei.
		In this third form of beta decay, an inner orbiting electron is attracted into an unstable nucleus where it combines with a proton to form a neutron.
		The scheme is for hydrogen-3 which decays to helium-3, with a half-life of 12.3 years, through the emission of a beta-minus particle with an energy of 0.0057 MeV.
	www.bh.rmit.edu.au /mrs/subject/mr100/decay.html (2362 words)

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