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Nature physics
Nature physics

The Scintillation Light Yield per MeV of Deposited Energy in CF4
The Scintillation Light Yield per MeV of Deposited Energy in CF4

... a typical RICH detector, the HBD uniquely lacks windows and mirrors to accommodate the geometry and limitations of PHENIX. The light produced by the Cherenkov radiation is directly collected by a number of triple gas electron multiplier (GEM) stacks which surround the active volume of the detector. ...
ISSI Meeting Berne, Switzerland, 19
ISSI Meeting Berne, Switzerland, 19

... In the solar wind reference frame ions are created with a speed equal to the solar wind speed in the comet’s rest frame and they form a ring in velocity space as they gyrate about the magnetic field lines. Excess free energy in the ring distribution renders it highly unstable and low frequency Alfv ...
Ch 01
Ch 01

... a. If the two identical point charges are positive, then the test charge experiences a repulsive force from each of the two fixed charges. Halfway between the charges, the resultant of these two repulsive forces will be zero since the distance from the test charge to either fixed charge is the same. ...
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Document

Electric Charges and Forces - University of Colorado Boulder
Electric Charges and Forces - University of Colorado Boulder

... The electric force is one of the fundamental forces of nature. Often, as you know from experience, rubbing two objects together causes them to experience an electric force. Examples: • Unrolling plastic rap • Running a comb through hair • Rubbing rubber/plastic/glass rods with fur and silk • Walking ...
electric field
electric field

... equal magnitude charges of opposite signs. The forces exerted on these particles by the electric field have equal magnitude and opposite directions. The electron experiences an acceleration of greater magnitude than does the proton because the electron’s mass is much smaller than that of the proton. ...
FEP Prep for Unit test
FEP Prep for Unit test

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Störmer

... having a charge smaller than the charge of any individual electron. This is not the way things are supposed to be. A collection of objects may assemble to form a bigger object, or the parts may remain their size, but they don’t create anything smaller. If the new particles were doubly charged, it wo ...
Data driven WZ background estimation for SUSY searches with
Data driven WZ background estimation for SUSY searches with

Conduction electrons propagate diffusively in the system: bumping
Conduction electrons propagate diffusively in the system: bumping

... Au. The points represent the experimental results. The solid curves are calculated with the same set of   as in the previous second graph but with a new time constant ...
UNIT 2 ATOMS, MATTER, AND THE MOLE
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... there are two atoms of hydrogen. 2. H2O2 is not water. It is called hydrogen peroxide, has two atoms of hydrogen for every two atoms of oxygen and behaves much differently that water. This brings us to the next law. F. LAW OF MULTIPLE PROPORTIONS-states that there can exist two or more compounds wit ...
A mesoscopic description of contractile cytoskeletal meshworks
A mesoscopic description of contractile cytoskeletal meshworks

... coordinate of filament i and motor j are xρi and xμj , respectively. The force acting on, e.g., filament 2 has two contributions corresponding to the two terms of eq. (4): interaction with the motor binding sites and interaction with the motor heads. The total force is given by ...
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13 Classical and quantum statistics

1) P - UCSD Physics
1) P - UCSD Physics

... Which group of charges took more work to bring together from a very large initial distance apart? ...
An Equivalent Electrical Model for Numerical Analyses of ODEP
An Equivalent Electrical Model for Numerical Analyses of ODEP

... Center for Micro/Nano Technology Research, National Cheng Kung University, Taiwan ...
Linear Momentum
Linear Momentum

... Linear momentum of an object is the mass of the object multiplied by its velocity. Momentum: p = m·vcom Unit: kg·m/s or N·s Newton expressed his 2nd law of motion in terms of ...
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Dec. 5 - The atom
Dec. 5 - The atom

... and lighter particle than even the smallest atom known, which has a negative electrical charge è electron n  Thomson argued that atoms are not the fundamental ...
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... J. C. Wynn, D. A. Bonn, B.W. Gardner, Yu-Ju Lin, Ruixing Liang, W. N. Hardy, J. R. Kirtley, and K. A. Moler, Phys. Rev. Lett. 87, 197002 (2001). ...
Optics, lens formula, one`s image is the next lens` object, light
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Synthesis of Copper (II)-Containing Nickel (II) Hydroxide Particles as
Synthesis of Copper (II)-Containing Nickel (II) Hydroxide Particles as

physical principles of advanced space propulsion based on heims`s
physical principles of advanced space propulsion based on heims`s

Modern Physics, the Beginning, and Creation Stephen M. Barr
Modern Physics, the Beginning, and Creation Stephen M. Barr

... doubtful that a collapsing universe would bounce rather than simply ending in a Crunch. And fourth, it was discovered in 1998 that the expansion of the universe is currently speeding up (the scientists who discovered this were awarded the Nobel Prize in physics for 2011), so that it is doubtful tha ...
Bose-Einstein condensation in interacting gases
Bose-Einstein condensation in interacting gases

... PACS. 05.30.Jp Boson systems – 05.30.-d Quantum statistical mechanics – 03.75.Fi Phase coherent atomic ensembles; quantum condensation phenomena ...
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Elementary particle



In particle physics, an elementary particle or fundamental particle is a particle whose substructure is unknown, thus it is unknown whether it is composed of other particles. Known elementary particles include the fundamental fermions (quarks, leptons, antiquarks, and antileptons), which generally are ""matter particles"" and ""antimatter particles"", as well as the fundamental bosons (gauge bosons and Higgs boson), which generally are ""force particles"" that mediate interactions among fermions. A particle containing two or more elementary particles is a composite particle.Everyday matter is composed of atoms, once presumed to be matter's elementary particles—atom meaning ""indivisible"" in Greek—although the atom's existence remained controversial until about 1910, as some leading physicists regarded molecules as mathematical illusions, and matter as ultimately composed of energy. Soon, subatomic constituents of the atom were identified. As the 1930s opened, the electron and the proton had been observed, along with the photon, the particle of electromagnetic radiation. At that time, the recent advent of quantum mechanics was radically altering the conception of particles, as a single particle could seemingly span a field as would a wave, a paradox still eluding satisfactory explanation.Via quantum theory, protons and neutrons were found to contain quarks—up quarks and down quarks—now considered elementary particles. And within a molecule, the electron's three degrees of freedom (charge, spin, orbital) can separate via wavefunction into three quasiparticles (holon, spinon, orbiton). Yet a free electron—which, not orbiting an atomic nucleus, lacks orbital motion—appears unsplittable and remains regarded as an elementary particle.Around 1980, an elementary particle's status as indeed elementary—an ultimate constituent of substance—was mostly discarded for a more practical outlook, embodied in particle physics' Standard Model, science's most experimentally successful theory. Many elaborations upon and theories beyond the Standard Model, including the extremely popular supersymmetry, double the number of elementary particles by hypothesizing that each known particle associates with a ""shadow"" partner far more massive, although all such superpartners remain undiscovered. Meanwhile, an elementary boson mediating gravitation—the graviton—remains hypothetical.
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