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Topic: Neutron emission

Related Topics

Positron emission

Proton emission

Electron capture

Internal conversion

Double beta minus decay

Beta decay

Spontaneous fission

Alpha emission

Alpha decay

Neutron

Radioactive decay

Gamma radiation

Nucleosynthesis

Nuclear chain reaction

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	Glossary Item - Neutron Emission
		Neutron emission is one process that unstable atoms can use to become more stable.
		During neutron emission, a neutron is ejected from an atom's nucleus.
		For example, after undergoing neutron emission, an atom of beryllium-13 (with 9 neutrons) becomes an atom of beryllium-12 (with 8 neutrons).
	education.jlab.org /glossary/neutron_emission.html (77 words)

	Nuclear Science Glossary
		Disappearance of a radioactive substance due to nuclear emission of an alpha or beta particle, capture of an atomic electron, neutrinos, spontaneous fission, and the emission of bremsstrahlung, x-rays, and conversion electrons.
		When a large amount of decay energy is available, beta-delayed emission of neutrons, protons, and other particles may occur.
		Gamma rays emission is a decay mode by which excited state of a nucleus de-excite to lower (more stable) state in the same nucleus.
	ie.lbl.gov /education/glossary/Glossary.htm (1718 words)

	Other Modes of Radioactive Decay \| Radiation Protection Program \| US EPA (Site not responding. Last check: 2007-10-15)
		Neutron radiation is energy released from an atom in the form of neutral particles called neutrons.
		Neutron radiation is used by researchers to investigate the sub-atomic structure of matter.
		Since the proton is essentially changed to a neutron, the number of neutrons increases by 1, the number of protons decreases by 1, and the atomic mass remains unchanged.
	www.epa.gov /radiation/understand/positron.htm (546 words)

	Neutron Emission Measurements (Site not responding. Last check: 2007-10-15)
		The neutron detection systems presently operating on FTU are of three types: 1) proportional counters (BF and fission chambers) for time-resolved absolute neutron yield measurements; 2) foil activation technique for time-integrated absolute neutron yield measurements; 3) scintillators for time-resolved neutron emission measurements; 4) collimated scintillator for space/time-resolved neutron emission measurements.
		In FIGURE 1 is shown the time evolution of the neutron emission in a 1.1 MA discharge (#5546) obtained as an average of the signals of the six BF chambers and the three FC (saturated chambers are excluded); the FC signal shows poor statistics due to low count rate.
		The fast variations of the neutron emission from the plasma are due either to intrinsic magnetic instabilities of the plasma column, which can produce sawtooth-like periodic signals, or to some external means such as additional heating or pellet fuelling.
	www.afs.enea.it /basilio/neutronica/Neutroni.html (2529 words)

	[No title]
		Neutron emissions from an electrolysis cell were measured with two detectors; a (3)He and a BF3 one, with surrounding paraffin blocks and Cd shielding.
		Neutrons were detected by an array of six (3)He counters around the water-filled region, shielded by paraffin and protected from external neutron background by a shield of borate polyethylene and grounded aluminium.
		A two-(3)He-tube neutron detector and Pb shielding bricks were arranged around a cell containing variously a calibrating neutron source or a sample of the material, exposed to D2 gas at 40 and 36 bar.
	www.ibiblio.org /pub/academic/physics/Cold-fusion/cnf-pap (15892 words)

	Portable Neutron Generators
		Neutron emission from the d-d reaction is slightly peaked in the forward (along the axis of the ion beam) direction.
		The neutron tube is, in turn, enclosed in a metal housing, the accelerator head, which is filled with a dielectric media to insulate the high voltage elements of the tube from the surroundings.
		Neutron generator with built in alpha particle detector uses an interesting physical property of the deuterium-tritium reaction, namely that the target emits an alpha particle simultaneously with, and at exactly at 180 degrees opposite to, each fast 14 MeV neutron produced.
	www.sciner.com /Neutron/Neutron_Generators_Basics.htm (1805 words)

	CHEMystery: Nuclear Reactions: Radioactivity
		Neutrons in the nucleus also help by keeping the protons farther apart from each other and "diluting" the nucleus.
		The resulting nucleus is missing 2 protons and 2 neutrons resulting in a charge loss of 2 and mass loss of 4.
		Beta radiation is the emission of high energy electrons from the nucleus of an atom.
	library.thinkquest.org /3659/nucreact/radioactivity.html (650 words)

	Ionising Radiation - Facilities
		The neutron source is placed at the centre of a spherical bath, 1 m in diameter, containing an aqueous solution of manganese sulphate.
		The neutron emission rate is calculated from the ã-count rate at saturation, applying appropriate correction factors.
		The source emission rate is obtained by comparison with a source of the same type which has been measured in the manganese bath.
	www.npl.co.uk /ionrad/services/neutrons/radionuclide.html (411 words)

	Why alpha decay but no neutron emission? (Site not responding. Last check: 2007-10-15)
		Additionally, any nucleus with a neutron number greater than 126 is unstable (radioactive), and any nucleus with a neutron to proton ratio greater than about 1.5 is also radioactive.
		Emission of alpha particles is a reasonably effective manner to accomplish this.
		Emission of groups of nucleons heavier than alpha particles tends to be precluded by the large Coulomb barrier requirements that prevails.
	www.hps.org /publicinformation/ate/q5227.html (596 words)

	Approaching the photon sphere. (Site not responding. Last check: 2007-10-15)
		Neutrons that elastically scatter off atoms can create an ionization track that is detectable, but the experiments are not as simple to hjc neutron jacket carry out; other means for detecting neutrons, consisting of allowing them to interact with atomic nuclei, are more commonly used..
		Neutron stars are extreme in many other ways, too.Pulsations immy neutron of neutron stars typically have periods of milliseconds, not seconds.BATSE should be able to see them far enough away that the distribution should be more like a pancake than a sphere.
		As mentioned immy neutron earlier, this is how we think we get millisecond pulsars.Magnetars have long rotation periods, typically 5 to 12 seconds, because their strong magnetic fields have caused them to slow down.The SNS will provide the most intense pulsed neutron beams in the world for scientific research and jimmy neutron tv industrial development.
	rompfinally.sitesled.com /compositespolymersnanotubes/scunthorpe.html (2509 words)

	[[ Lunar Reconnaissance Orbiter ]] (Site not responding. Last check: 2007-10-15)
		Neutron emission is accompanied by emission of gamma rays from nuclei that were excited by neutrons.
		The energy spectrum of leaking neutrons depends on the composition of the soil, and mostly, on the content of hydrogen, because H nuclei are the best moderators of high-energy neutrons due to inelastic collisions.
		Comparison between neutron maps for the Moon and Mars points out the strong effect of regional variations due to the large enhancement of H content in the second case.
	lunar.gsfc.nasa.gov /missions/lend.html (363 words)

	Shielding for organic thorium fluorides
		Neutron emission rates for thorium fluoride sources were not found, but using data found in the Handbook of Health Physics and Radiological Health (1998), p.
		(Higher-energy neutrons can be produced with the higher-energy daughter alphas, but the fluence per unit dose equivalent is very neutron-energy insensitive in the range of neutron energies under consideration here).
		Th daughters with time also gives increasing beta and gamma emissions, but shielding for the gamma radiation would also not be indicated since a gamma dose rate of less than 1 mrem/h at 30 cm is calculated for 200 g of thorium in equilibrium with its daughters.
	www.hps.org /publicinformation/ate/q2041.html (750 words)

	Triton burnup neutron emission
		Measurement and interpretation of the spectrum of the triton burnup neutron emission from deuterium tokamak plasmas
		The measured triton produced neutron spectrum is described with reference to the triton slowing down behaviour in the plasma and pertinent parameter dependences as predicted with a time dependent model.
		The first study of the triton burnup neutron spectrum for both transient and quasi-steady-state plasma conditions is presented and a description based on classical confinement and slowing down of fast tritons is largely supported.
	epub.iaea.org /fusion/public/40/jan/ms6733BallaL/6733.abstract.html (189 words)

	Proton emission - Wikipedia, the free encyclopedia
		Proton emission (also known as proton radioactivity) is a type of radioactive decay in which a proton is ejected from a nucleus.
		Proton emission can occur from high-lying excited states in a nucleus following a beta decay, in which case the process is known as beta-delayed proton emission, or can occur from the ground state (or a low-lying isomer) of very proton-rich nuclei, in which case the process is very similar to alpha decay.
		The study of proton emission has aided the understanding of nuclear deformation, masses and structure, and it is a wonderfully pure example of quantum tunneling.
	en.wikipedia.org /wiki/Proton_emission (294 words)

	Neutron emission in proton induced reactions
		Barium fluoride is an efficient detector material for neutrons in a wide energy range [1,2].
		Neutrons were detected by TAPS which was configured in 6 blocks of 64 BaF
		Based on the available data it is possible to calculate the neutron detection efficiency for a given amplitude threshold, see figure 1.
	www.kvi.nl /~annrep/ar1997/node27.html (291 words)

	APPLIED PHYSICS: A SIMPLE NEUTRON GENERATOR (Site not responding. Last check: 2007-10-15)
		A minute or two after the heat is applied, neutron emission starts, reaching a peak of about 1000 per second; once the heat source is removed, the device gradually switches itself off.
		Progress is fueled not only by the availability of novel neutron optics, such as microcollimators, supermirrors, or focusing monochromators, but also by the urgent need for characterization tools that meet the demands of the advances in biochemical and semiconductor nanoscience.
		The simple use of slits to define a submicrometer neutron beam width in the range of 100 5000 angstroms is, however, both difficult and inefficient for various reasons.
	scienceweek.com /2005/sw050520-2.htm (1347 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.
		If the proton and neutron are part of an atomic nucleus, these decay processes transmute one chemical element into another.
		In 1931 Enrico Fermi renamed Pauli's "neutron" to neutrino, and in 1934 Fermi published a very successful model of beta decay in which neutrinos were produced.
	en.wikipedia.org /wiki/Beta_emission (817 words)

	UMR News and Research: Research suggests neutron repulsion a major energy source
		The research, published in the Journal of Fusion Energy, confirms that neutron repulsion is an energy source on the Sun, and may in fact be the major source of energy for most solar power.
		"Neutron emission in the core of the Sun may trigger a series of reactions that collectively produce the Sun's luminosity and an outpouring of protons and neutrinos from its surface," writes Erin Miller of of Weskan, Kan., a sophomore chemistry major at UMR.
		The fraction of mass converted to energy through neutron repulsion is greater than for uranium fission or hydrogen fusion, the next greatest known sources of energy," says Manuel, who is a nuclear chemist.
	news.umr.edu /research/2003/116.html (508 words)

	Extreme Ultraviolet Emission from Neutron Stars (Site not responding. Last check: 2007-10-15)
		For the case of PSR B0656+14 the lack of flux modulation with pulse period argues that the EUV radiation originates from the cooling neutron star surface rather than from a hot polar cap.
		If the emission is from a thermalized neutron star surface, then limits can be placed on the surface temperature.
		We also have a weak indication that the EUV emission from Geminga is pulsed in a manner consistent with the lowest energy channel observed with ROSAT.
	www.cea.berkeley.edu /~euve/sci/Resources_pubs_abstracts_neutron_foste.html (313 words)

	Neutron emission - Wikipedia, the free encyclopedia
		Neutron emission is a type of radioactive decay in which an atom contains excess neutrons and a neutron is simply ejected from the nucleus.
		Two examples of isotopes which emit neutrons are helium-5 and beryllium-13.
		However, the decay of helium-5 is also (by definition) a case of alpha-decay.
	en.wikipedia.org /wiki/Neutron_emission (90 words)

	Neutron emission from JET DT plasmas
		The neutron emission spectrum from d+t→α+n reactions has been measured as a means to study the plasma response to radio frequency (RF) power coupled to hydrogen and deuteron minority components (through fundamental and second harmonic, respectively) in a tritium discharge at JET.
		The spectrum was measured with the magnetic proton recoil spectrometer and was analysed in terms of two spectral components due to thermal (TH) and high-energy (HE) deuterons interacting with the bulk ion population of thermal tritons.
		This paper illustrates qualitatively the type of empirical ion kinetic information that can be obtained from neutron emission spectroscopy; the data serves as a basis for comparison with results of predictive and interpretative models on RF effects in plasmas.
	stacks.iop.org /0741-3335/44/1253 (373 words)

	Baryon emission processes (Site not responding. Last check: 2007-10-15)
		Neutron emission is a much more pressing problem for an aspiring strangelet.
		Neutron emission could also occur via the weak interactions, but this flavor-changing weak process will of course be suppressed.
		Since Z does not change in neutron emission, we can take a slice through the decay space at constant Z to examine the decay process.
	www.physics.rutgers.edu /~jholden/strange/node15.html (232 words)

	European Neutron-Muon Portal
		The chairman was elected at the III Meeting of the Spanish Society of Neutron Techniques hold from the 10th to 13th of September 2006 in Jaca.
		Neutron beams are generated in research reactors or spallation sources.
		Neutrons also enable particularly sensitive material analyses to be performed, for example the detection of trace substances in environmental research.
	neutron.neutron-eu.net /n_news (7656 words)

	Measurement of the neutron spectra from beam-heated PLT plasmas
		Measurement of the neutron spectra from beam-heated PLT plasmas
		The neutron spectra indicated a directed velocity of the reacting deuterons and thus non-thermonuclear neutron emission if the injected neutral beam ions were deuterium.
		However, if the heating beam used hydrogen, then the neutron spectra are consistent with a thermonuclear neutron emission resulting from the beam heating of the bulk deuterons in the plasma.
	www.nature.com /nature/journal/v279/n5714/abs/279626a0.html (220 words)

	NSCL - Neutron Emission Ratio Observer (NERO) - Importance (Site not responding. Last check: 2007-10-15)
		If that is the case, a different nucleus is created in the process than if a neutron had not been ejected.
		Another application of NERO is to measure the efficiency of the nuclear reactions that create neutrons in stars needed for building new elements.
		The results are used to test whether a given astrophysical model of a star makes enough neutrons to synthesize new elements.
	www.nscl.msu.edu /tech/devices/nero/importance.html (355 words)

	Decay Mode Table (Site not responding. Last check: 2007-10-15)
		Conversion of a proton to a neutron and emission of an positron and an neutrino.
		Capture of an atomic electron converting a proton to a neutron and emission of a neutrino.
		Conversion of two protons to two neutrons and emission of two positrons and two neutrinos.
	isotopes.lbl.gov /education/decmode.html (133 words)

	Computational Nuclear Structure Research
		Nuclei outside the driplines decay by spontaneous neutron emission or proton radioactivity.
		We observe a strong neutron density enhancement at the center and a corresponding depletion in the proton density which is due to occupied (unoccupied) s orbitals near the Fermi level.
		The neutron density is substantially larger than the proton density for all values of r giving rise to a sizable neutron skin.
	www.physics.vanderbilt.edu /volker/research/nucphys_veo.html (2436 words)

	Neutron Courses: Exploring matter with Neutrons Encyclopedia CD-ROM
		Exploring matter with Neutrons presents examples from cutting-edge research happening inside research facilities and research labs world-wide, enriched with scientific and historical background information for educational purpose.
		The encyclopedia reflects more then 20 man/years' work in 6 years, being continuously updated, verified and validated by neutron and education experts.
		The scientific content of the Nanopolis encyclopedias is continuously updated in order to keep you connected to the most recent and important accomplishments in the field.
	neutrons.nanopolis.net /courses.html (130 words)

	ANS : Store : Electronic Articles
		The results are intended to be used to predict the neutron emission before each discharge.
		show neutron emission after installation of the divertor to be lower than before.
		A set of scaling laws is found that predicts the neutron emission within a factor of 2, which is consistent with our objective.
	www.ans.org /store/index.cgi?i=E100000-fst-33-3-341-349 (313 words)

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