In nuclear physics, the concept of a neutron cross section is used to express the likelihood of interaction between an incident neutron and a target nucleus. The neutron cross section σ can be defined as the area in cm2 for which the number of neutron-nuclei reactions taking place is equal to the product of the number of incident neutrons that would pass through the area and the number of target nuclei. In conjunction with the neutron flux, it enables the calculation of the reaction rate, for example to derive the thermal power of a nuclear power plant. The standard unit for measuring the cross section is the barn, which is equal to 10−28 m2 or 10−24 cm2. The larger the neutron cross section, the more likely a neutron will react with the nucleus. An isotope (or nuclide) can be classified according to its neutron cross section and how it reacts to an incident neutron. Nuclides that tend to absorb a neutron and either decay or keep the neutron in its nucleus are neutron absorbers and will have a capture cross section for that reaction. Isotopes that undergo fission are fissionable fuels and have a corresponding fission cross section. The remaining isotopes will simply scatter the neutron, and have a scatter cross section. Some isotopes, like uranium-238, have nonzero cross sections of all three. Isotopes which have a large scatter cross section and a low mass are good neutron moderators (see chart below). Nuclides which have a large absorption cross section are neutron poisons if they are neither fissile nor undergo decay. A poison that is purposely inserted into a nuclear reactor for controlling its reactivity in the long term and improve its shutdown margin is called a burnable poison. (Wikipedia).
Astronomy - Ch. 22: Neutron Star (6 of 17) The Structure 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 structural density of a neutron star has 4 basic density regions. The inner core (0-3km) has a density=2 times the
From playlist ASTRONOMY 22 NEUTRON STARS & PULSARS
Nuclear Fission; splitting the atom for beginners: from fizzics.org
There are notes to support this video here:https://www.fizzics.org/nuclear-fission/ Nuclear Fission is the splitting of the nucleus of an atom into two or more parts by hitting it with a small particle, almost always a neutron (a proton would be repelled from the positive nucleus and an el
From playlist My Top Videos
Astronomy - Ch. 22: Neutron Star (3 of 17) What is Neutron Degeneracy?
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 neutron degeneracy pressure can uphold a neutron star with a mass up to 0.7 time mass of our Sun. Two neutrons with the
From playlist THE "WHAT IS" PLAYLIST
Particle Physics (31 of 41) What is a Photon? 15. Mie Scattering - Radar Cross Section
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain the graph of the principle of Mie scattering of particles the size of 1/10 of a wavelength to 1 wavelength. Next video in the Particle Physics series can be seen at: http://youtu.be/mvFp20Bpz
From playlist PHYSICS 65 PARTICLE PHYSICS
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From playlist Chemistry
The model of the atom - Bounded by the light
Reworking of the Weekend's blinded by the light
From playlist Level 2 NCEA Physics
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From playlist Science Unplugged: Particle Physics
Shape of the Nuclear Potential
Describing the shape of the nuclear potential over the range of the nuclear force. Explains why nucleons aren't crushed together.
From playlist Nuclear Physics
Lec 2 | MIT 22.091 Nuclear Reactor Safety, Spring 2008
Lecture 2: Reactor physics review Instructor: Andrew Kadak View the complete course: http://ocw.mit.edu/22-091S08 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT 22.091 Nuclear Reactor Safety, Spring 2008
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
22. Simplifying Neutron Transport to Neutron Diffusion
MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016 Instructor: Michael Short View the complete course: https://ocw.mit.edu/22-01F16 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP61FVzAxBP09w2FMQgknTOqu As many simplifications as possible a
From playlist MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016
HEDS | Nuclear Science Experiments for National Security and Fundamental Science on NIF
Presented by Dawn Shaughnessy. LLNL-VIDEO-821206
From playlist High Energy Density Science Seminar Series
MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016 Instructor: Michael Short View the complete course: https://ocw.mit.edu/22-01F16 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP61FVzAxBP09w2FMQgknTOqu The full, seven-dimensional neutron t
From playlist MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016
25. Review of All Nuclear Interactions and Problem Set 7 Help
MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016 Instructor: Michael Short View the complete course: https://ocw.mit.edu/22-01F16 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP61FVzAxBP09w2FMQgknTOqu Students' questions on the past month
From playlist MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016
The contribution of Spin to the depth of the Nuclear Potential
From playlist Nuclear Physics
MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016 Instructor: Michael Short View the complete course: https://ocw.mit.edu/22-01F16 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP61FVzAxBP09w2FMQgknTOqu Ka-Yen's lecture on how nuclear react
From playlist MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016
24. Transients, Feedback, and Time-Dependent Neutronics
MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016 Instructor: Michael Short View the complete course: https://ocw.mit.edu/22-01F16 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP61FVzAxBP09w2FMQgknTOqu The students explore their data from
From playlist MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016
23. Solving the Neutron Diffusion Equation, and Criticality Relations
MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016 Instructor: Michael Short View the complete course: https://ocw.mit.edu/22-01F16 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP61FVzAxBP09w2FMQgknTOqu The hideous neutron transport equatio
From playlist MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016
Atomic mass unit explained and its relationship to the kilogram
The atomic mass unit is a non-SI unit for mass regualrly used in nuclear physics. since it allows for easier comparisons between atoms. I discuss how it came about, how it relates to the kilogram and the eV/c2, and how to use it in nuclear reactions See www.physicshigh.com for all my vi
From playlist Modern Physics
12. Numerical Examples of Activity, Half Life, and Series Decay
MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016 Instructor: Michael Short View the complete course: https://ocw.mit.edu/22-01F16 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP61FVzAxBP09w2FMQgknTOqu A few example problems are posed and
From playlist MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016