Alpha Particle - The nucleus of a helium atom, consisting of two protons and two neutrons ...
Alpha Particle X-Ray Spectrometer (APXS) for close-up analysis of the elements that make up rocks and soils.
Alpha Particles
Particles first discovered in radioactive decay, and later identified as helium nuclei (two protons and two neutrons bound together).
Altair ...
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium atomic nucleus; hence, it can be written as He2+ or 42He2+....
s through a thin sheet of gold
Gold ...
Alpha particle--A type of fast ion emitted by many types of heavy radioactive nuclei, such as uranium. Actually, the nucleus (atom stripped of all electrons) of the gas helium.
Ampere--see electric current.
Alpha particle Helium nucleus: two protons, two neutrons, NO electrons. Alpha particles are ions.
Alpha Particle Spectrometer (APS)
This was designed to detect radon outgassing events on the surface of the moon. The APS recorded alpha particle signatures of radioactive decay of radon gas and its daughter product, polonium.
alpha particle - (n.)
A cluster of two protons and two neutrons; a helium nucleus.
Andromeda galaxy - (n.) ...
The alpha particle spectrometer instrument will be used to find radon outgassing events on the lunar surface by detecting alpha particles from the radon gas itself and its decay product, polonium.
The Alpha Particle X-Ray Spectrometer could reveal major and minor element chemistry, while the Pancam and Microscopic Imager could document possible sedimentary textures, ...
Factual note: Alpha particles cause bit rot, cosmic rays do not (except occasionally in spaceborne computers). Intel could not explain random bit drops in their early chips, and one hypothesis was cosmic rays.
alpha disintegration (NASA SP-7, 1965) = alpha decay Alpha emission (Plasma Physics and Fusion Energy Glossary) Form of nuclear decay where the nucleus emits an alpha particle (see entry below).
Four protons are, in net, converted into an alpha particle and two positrons (with accompanying neutrinos); ...
Its atom comprises two protons, two neutrons and two electrons; its nucleus is sometimes called an alpha particle. Helium is the product of the nuclear fusion of hydrogen in most stars, but this does not explain the overall helium abundance. [A84] ...
The APXS works by irradiating rocks and soil samples with alpha particles (helium nuclei, which consist of two protons and two neutrons). The results indicated that "Barnacle Bill" is much like Earth's andesites, confirming past volcanic activity.
He had observed in Montreal that fast-moving alpha particles on passing through thin plates of mica produced diffuse images on photographic plates, whereas a sharp image was produced when there was no obstruction to the passage of the rays.
This is sort of a silly sounding name, but it comes from the old fashioned name for helium (alpha particle), and when you combine three helium atoms together, you make carbon (as well as energy), ...
Uranium decays slowly by emitting an alpha particle. The half-life of uranium-238 is about 4.
In 1930 Walther Bothe and Herbert Becker in Germany found that if the very energetic alpha particles emitted from polonium fell on certain light elements, specifically beryllium, boron, or lithium, an unusually penetrating radiation was produced.
process, the stellar core contracts (while the outer layers expand) until sufficiently high temperatures are reached to initiate "helium-burning" by the triple-alpha process; in this process, three helium nuclei (alpha particles) are fused to make a ...
It has long been known that the Earth is bombarded by huge numbers of charged particle cosmic rays, mostly protons, electrons, and alpha particles.
Helium-4 nuclei are traditionally known as alpha particles. The term dates from the early days of nuclear physics, when the true nature of these particles was unknown.
ALPHA DECAY - Nuclear decay by emission of an alpha particle.
ALPHA (α) PARTICLE - Term used to describe a helium nucleus (4He nucleus). Alpha particles were discovered by Ernest Rutherford (1871-1937) in 1898.
A process by which lighter elements capture helium nuclei (alpha particles) to form heavier elements. For example, when a carbon nucleus captures an alpha particle, a heavier oxygen nucleus is formed.
Altitude-azimuth ...
The nuclear fusion process that combines three helium nuclei (alpha particles) to make one carbon nucleus.
True Relative Orbit
The orbit of one star in a visual binary with respect to the other star after correction for orbital inclination.
Most of the ions are in the form of energetic protons, but a certain percentage are alpha particles and O+ oxygen ions, similar to those in the ionosphere but much more energetic.
Triple Alpha Reaction: The process by which helium (also known as an alpha particle) is converted into carbon. When temperatures are high and the density of helium is large, three helium atoms can combine to form one Carbon atom.
triple-alpha process The generation of Carbon-12 from the fusion of three helium-4 nuclei (alpha particles). Helium-burning stars occupy a region of the H-R diagram known as the horizontal branch.
Gamma-ray Spectrometer
Neutron Spectrometer
Electron Reflectometer
Alpha Particle Spectrometer ...
In this process, three helium nuclei (or 'alpha particles') fuse together to form carbon-12. Oxygen-16 is formed if another helium nucleus fuses with this.
As three helium nuclei, also known as alpha particles, are used it is called the triple alpha process. Subsequent fusion with another helium nucleus produces oxygen-16 nuclei.
triple alpha process: The nuclear fusion process that combines three helium nuclei (alpha particles) to make one carbon nucleus.
Naturally radioactive materials (found in the earth's crust) give off alpha, beta, or gamma particles. Alpha particles are Helium nuclei, beta particles are electrons, and gamma particles are high energy photons.
There are special plastic shields which stop beta particles and air will stop alpha particles. Inserting the proper shield between you and the radiation source will greatly reduce or eliminate the extra radiation dose.
of gases such as hydrogen and small quantities of meteorites and meteoric dust. X rays, ultraviolet radiation, visible light, and infrared radiation from the sun all traverse space. Cosmic rays, consisting mainly of protons, alpha particles, ...
What we need is a three particle interaction (which is much rarer than a two particle interaction). This is known as the triple-alpha reaction. Helium nuclei are also known as alpha particles, and it takes three of them to form a carbon, ...
 See also: Energy, Time, Electron, Earth, Mass
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