The Cryogenic Dark Matter Search (CDMS), buried half a mile deep in an old Minnesota iron mine to shield it from cosmic rays, searches for collisions between dark - matter particles called WIMPS and
ordinary atoms in 19 hockey - puck - size hunks of germanium.
Not exact matches
At present, the density of
ordinary baryons and radiation
in the universe is estimated to be equivalent to about one hydrogen
atom per cubic metre of space.
In abandoned mines in Minnesota and Ontario, researchers have built WIMP detectors designed to pick up the weak response when a dark particle strikes an ordinary ato
In abandoned mines
in Minnesota and Ontario, researchers have built WIMP detectors designed to pick up the weak response when a dark particle strikes an ordinary ato
in Minnesota and Ontario, researchers have built WIMP detectors designed to pick up the weak response when a dark particle strikes an
ordinary atom.
The Big Bang theory makes detailed predictions about the total number of
ordinary atoms and about the relative abundance of deuterium (heavy hydrogen) and helium
in the universe.
Dark energy accounts for most of its mass, exotic dark matter comes
in second place, and
ordinary matter — the
atoms we are made of — lands
in a distant third place, with just 4.4 percent.
Whereas «up» and «down» quarks instantly condense to form protons and neutrons, the addition of «strange» quarks makes a stable nugget that can grow far more massive than the nuclei of
ordinary atoms, Witten proposed
in 1984.
In fact, the latest survey of the Big Bang's residual light suggests that more than 84 percent of the matter in the cosmos is of the «dark» variety: exotic particles unlike the ordinary atoms that make up our everyday world and the objects therei
In fact, the latest survey of the Big Bang's residual light suggests that more than 84 percent of the matter
in the cosmos is of the «dark» variety: exotic particles unlike the ordinary atoms that make up our everyday world and the objects therei
in the cosmos is of the «dark» variety: exotic particles unlike the
ordinary atoms that make up our everyday world and the objects therein.
This is because its low temperature and high phase - space density make coherent stimulated emission possible:
in an
ordinary thermal gas of Ps, the Doppler shifts of the
atoms would suppress lasing action.
That density depends upon the temperature of the Ps, but it is likely to be
in the range of 1018 Ps
atoms per cubic centimeter, which is about 3 % of the density of
ordinary air.
23 STRANGE MATTER
Ordinary atoms contain particles called quarks, which come
in two varieties: up and down.
Besides learning about that technique, however, I wanted to experience an atmosphere
in which
atoms were
ordinary, everyday objects, like cups and saucers and grains of sand.
Created by essentially strapping a hacked Kinect to an iRobot Create (a sort of blank Roomba platform used by robotics developers) along with a gutted Intel
Atom computer, the KinectBot uses the Kinect bar's 3D sensors
in ways that'd make an
ordinary Roomba hopelessly jealous.
And that is that the people who were working out the consequences of quantum mechanics, shortly after quantum mechanics was discovered
in 1924 and» 25, began to understand how
atoms and molecules really worked, and they asked elementary questions about the world that even
ordinary people might ask.
In present - day estimates of the universe's makeup,
ordinary atoms (such as those we detect as the visible universe) contribute only about 5 percent; the bulk of the cosmos takes the form of so - called dark energy, under whose influence the universe is expanding at an increasing clip.
Nuclear physicists create the fireballs by colliding
ordinary nuclei — made of protons and neutrons —
in an «
atom smasher» called the Relativistic Heavy Ion Collider (RHIC), a U.S. Department of Energy Office of Science User Facility at Brookhaven National Laboratory.
If it all sounds too radical, that may be a good thing: most direct detection experiments, which wait for an
ordinary WIMP to collide with the nucleus of a heavy
atom like germanium or xenon, have seen nothing (see «Going underground
in search of dark matter strikes «-RRB-, for example.
When the antiprotons are close together, the strong force interaction overcomes the tendency of the like (negatively) charged particles to repel one another
in the same way it allows positively charged protons to bind to one another within the nuclei of
ordinary atoms.
Not exactly a wave
in the
ordinary sense, the swerve was a deviation from straight line motion postulated by the Greek philosopher Epicurus around 300 B.C. Unlike Aristotle, Epicurus believed
in atoms, and argued that reality was built entirely from the random collisions of an infinite number of those tiny particles.
Here the antiproton and a proton or neutron from an
ordinary nucleus, presumably that of a silver or bromine
atom in the photographic emulsion, would die simultaneously.
Baryons are particles of normal or «
ordinary» matter (e.g., such as protons and neutrons) that make up more than 99.9 percent of the mass of
atoms found
in the cosmos.
The collisions free the quarks and gluons from their confinement within
ordinary particles — the protons and neutrons that make up the nucleus of
atoms — so nuclear physicists can study their interactions and the force that holds them together
in the universe today.
In his disturbing child - abduction thriller, The Captive, writer / director
Atom Egoyan explores the ambiguous nature of the human condition and how
ordinary people react when drawn into dreadful circumstances.
Heavy water: Water containing a significantly greater proportion of heavy hydrogen (deuterium)
atoms to
ordinary hydrogen
atoms than is found
in ordinary (light) water.
1) that everything was made up of smaller indivisible objects (
atoms) 2) that the earth went round the sun 3) that life started
in the mud around the edges of the waters of the earth 4) that the wind was a thin substance so thin that it was invisible, but still made of
ordinary matter just like the earth and the water