Neutron economy is defined as the ratio of an adjoint weighted average of the excess neutron production divided by an adjoint weighted average of the fission production. The distribution of neutron energies in a nuclear reactor differs from the fission neutron spectrum due to the slowing down of neutrons in elastic and inelastic collisions with fuel, coolant and construction material. Neutrons slow down in elastic and inelastic collisions, until they are absorbed via Neutron capture or lost by leakage. Neutron economy is the balanced account, in a reactor, of the neutrons created and the neutrons lost through absorption by non-fuel elements, resonance absorption by fuel, and leakage while fast and thermal energy ranges. Heavy water is an extremely efficient moderator. As a result, reactors using heavy water, such as the CANDU, also have a high neutron economy. The quantity that indicates how much the neutron economy is out of balance is given the term reactivity. If a reactor is exactly critical—that is, the neutron production is exactly equal to neutron destruction—the reactivity is zero. If the reactivity is positive, the reactor is supercritical. If the reactivity is negative, the reactor is subcritical. The term "neutron economy" is used not just for the instantaneous reactivity of a reactor, but also to describe the overall efficiency of a nuclear reactor design. (Wikipedia).
What are neutron stars? (Astronomy)
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From playlist Astronomy
Teach Astronomy - Properties of Neutron Stars
http://www.teachastronomy.com/ Neutron stars are truly remarkable objects. Think of something with the mass of the Sun, normally one and a half million kilometers across, compressed down to the size of a small asteroid, about twenty kilometers across. Conservation of angular momentum dic
From playlist 16. Stars 3
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From playlist Science Unplugged: Particle Physics
When a dying star is too massive to leave behind a white dwarf and not massive enough to leave behind a black hole, you get a neutron star (sometimes a pulsar). It's a very compact clump of neutrons surrounded by a very strong magnetic field. These things are crazy!! ______________________
From playlist Astronomy
Neutron Stars – The Most Extreme Things that are not Black Holes
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From playlist The Universe and Space stuff
Astronomy - Ch. 22: Neutron Star (1 of 17) What is a Neutron Star?
Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 We will learn a neutron star is the remnant of the collapse of he core of a super massive star (greater than 8 times the of our Sun).
From playlist THE "WHAT IS" PLAYLIST
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From playlist Physics
Astronomy - Ch. 22: Neutron Star (7 of 17) What is the Upper Limit of a Neutron Star?
Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 We will learn the upper and lower limit of a neutron star are 1.0-2.5 times the mass of our Sun, and about 12 miles or 20 km in diame
From playlist THE "WHAT IS" PLAYLIST
Google Tech Talks April 16,2007 ABSTRACT There are many common misconceptions about nuclear power that can be proven to be false, even among people with a variety of opinions. For example, it is often stated that nuclear power plants are very large and cost at least a couple of billion d
From playlist Energy and the Environment
Wait... Gold Came From Ancient Asteroids?!
Episode 1 of 3 Check us out on iTunes! http://apple.co/1TXDZAI Please Subscribe! http://bit.ly/28iQhYC Many scientists theorize that around 3.8-4.1 billion years ago asteroids loaded with gold from the collision of neutron stars pelted Earth and the moon. + + + + + + + + Pre
From playlist Where Did Gold Come From And Where Can It Take Us?
Thorium and the Future of Nuclear Energy
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From playlist Space Time!
LIFE: Laser Initial Fusion Energy System
May 13, 2009 - Ed Moses, principal associate director of the National Ignition Facility, Lawrence Livermore National Laboratory, discusses current laser inertial fusion energy technology and its potential to scale up to nationwide energy production in the next 10 years. The Energy Seminar
From playlist Lecture Collection | Energy Seminar
Energy resources and electricity generation, explanation and analysis: fizzics.org
This video lesson is a detailed explanation of the way each common resource is used to generate electricity and the advantages and disadvantages of each. It starts with a very brief explanation of the way a generator works and the definitions of renewable and non-renewable used here. There
From playlist Electricity generation and supply
Teach Astronomy - Fission as an Energy Source
http://www.teachastronomy.com/ Fission is such an efficient energy source that humans have long tried to harness it. A massive atomic nucleus can be split by a neutron. Since the decay of a massive nucleus can also release a neutron, this raises the possibility of a chain reaction where
From playlist 13. Particle Physics and the Sun
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From playlist Space Time!
Q&A 103: How Many Stars Have Zero Planets? And More...
In this week's questions show, I explain why we'll never know which stars have no planets. How we could prevent a catastrophe to Earth, and why aliens might still be a threat to us. Check out more of Dustin Gibson's photographs at: https://www.instagram.com/gibsonpics/ 00:48 How many sta
From playlist Questions and Answers with Fraser Cain
10 Hardest Questions in AQA Chemistry Paper 1 - Grade 7, 8, 9 Booster Revision
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From playlist AQA Chemistry Paper 1 | Revision Playlist for Combined and Separate Science GCSE
HOW IT WORKS: Nuclear Propulsion
The theory, design, and operation of a nuclear propulsion engine advantages are explained verses conventional chemical rockets such as the Saturn V.
From playlist HOW IT WORKS
Physics - Nuclear Physics (1 of 22) Mass of Proton, Neutron, and Electron
Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to find the mass of proton, neutron, and electron.
From playlist MOST POPULAR VIDEOS