Sentences with phrase «slow neutrons in»

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Stapp arrives at this conclusion through a quantum mechanical analysis of the possible results of a double spin - measuring experiment, i.e., an experiment in which one measures the spins of each of two slow neutrons, say, which have just collided.

Composite photo of the slowest - spinning neutron star discovered so far (9 - 2016): background stars photographed in optical wavelengths; colorful cloud is the supernova remnant RCW 103, photographed in X-ray wavelengths, with the white neutron star at its center.

«Observations with multiple space telescopes have revealed that, while other neutron stars spin multiple times a minute, this object rotates only once about every 6.5 hours — making it by far the slowest - spinning star in its class discovered to date,» said David Burrows, professor of astronomy and astrophysics at Penn State.

And maps of slow - moving neutrons collected by NASA's Lunar Prospector, which orbited the moon in 1998 and 1999, suggested a number of craters are rich in hydrogen, though it was not clear whether the hydrogen was bound in water molecules or was present in some other form.

But then the evolution took a surprising turn: in all the simulations, no matter what the magnetic field looked like when the neutron star was born, the field took on a particular structure and its evolution dramatically slowed.

Slow neutrons down to walking pace and subtle changes in their behaviour could reveal signs of exotic new physics

Boynton and his team used the Odyssey instrument to zero in on energetic gamma rays, which are emitted by hydrogen when it is stimulated by subatomic collisions, and on sluggish neutrons that had been slowed down by their interaction with hydrogen.

Water can not be employed in a fast reactor to carry the heat from the core — it would slow the fast neutrons.

At slower speeds, many more neutrons are absorbed in nonfi ssion reactions and are lost.

«It became clear to Fermi almost immediately that in order to do this with natural uranium you had to slow down the neutrons,» Bethe said.

In addition to its unique fuel cycle, the TerraPower design employs a high - temperature, liquid metal core cooling technology suited to a breeder reactor with «fast» neutron activity, rather than today's predominant reactors whose water cooling systems slow neutrons.

How far they travel into space depends on their speed, and slower neutrons don't travel far enough to be seen by particle detectors in orbit around Earth.

Neutron stars usually spin very rapidly, so the asymmetric distribution of mass would deform space - time and produce a continuous gravitational - wave signal in the shape of a sine wave, which would radiate energy and slow down the star's spin.

These less energetic, slow neutrons are reflected back toward the detector; nonradioactive helium - 3 in low - pressure pipes collects them and emits electrons.

THE rapid spin of a neutron star is slowing in bursts — and it may be because of gravitational waves.

But when Demos Kazanas at the NASA Goddard Space Flight Center and his colleagues looked at 18 years» worth of X-ray observations of neutron stars in binary systems in the Small Magellanic Cloud, they found that half were slowing down — at the same rate as the others were accelerating.

In other instances, analysts had judged a plutonium operation was safe, but then more workers — whose bodies reflect and slow neutrons — wound up being present nearby, creating unanticipated risks.

The superabundant elements in the S - type stars come from the slow neutron process.

In the first such process, called the slow, or s -, process, the flux of neutrons is low.

It might be wise to go read our moderation page for a second and come back when you understand that neutrons emerge from fission reactions at high speeds and that we typically like to slow them down to thermal energies in order to increase their chances of continuing the chain reaction.

Being the same weight as neutrons, conservation of momentum and energy tell us that a neutron striking a hydrogen atom can slow down all the way from super fast to zero in one collision (imagine a billiard ball striking a stationary one), so water coolant is very good at slowing fast neutrons down to thermal energies.

In order to increase the number of thermal neutrons, thermal neutron reactor designers choose materials which slow down the fast neutrons in order to turn them into useful thermal neutronIn order to increase the number of thermal neutrons, thermal neutron reactor designers choose materials which slow down the fast neutrons in order to turn them into useful thermal neutronin order to turn them into useful thermal neutrons.

In these cases, the neutrons are moderated to lower their speed in the reaction as the chances of fission are greater with slow neutrons than with fast neutronIn these cases, the neutrons are moderated to lower their speed in the reaction as the chances of fission are greater with slow neutrons than with fast neutronin the reaction as the chances of fission are greater with slow neutrons than with fast neutrons.

When he returned to Spain to the JEN in the Fall 1963, he began research in the field of transport theory, slowing down and thermalisation of neutrons.

Heavy water is used as a moderator in some reactors because it slows neutrons effectively and also has a low cross section for absorption of neutrons.