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Study of motions and interactions of neutrons
Neutron transport (also known as neutronics) is the study of the motions and interactions of neutrons with materials. The neutron transport equation models
Neutron_transport
Total distance traveled by neutrons within a volume over a time period
The neutron flux is a scalar quantity used in nuclear physics and nuclear reactor physics. It is the total distance travelled by all free neutrons per
Neutron_flux
Low-yield thermonuclear weapon
A neutron bomb, officially defined as a type of enhanced radiation weapon (ERW), is a low-yield thermonuclear weapon designed to maximize lethal neutron
Neutron_bomb
Early computer
computer invented by physicist Enrico Fermi to aid in his studies of neutron transport. The FERMIAC was about 30 centimeters long and resembled a small trolley
FERMIAC
Subatomic particle with no charge
S-process Thermal-neutron reactor Neutron generator Neutron source Neutron bomb Neutron diffraction Neutron flux Neutron imaging Neutron transport Cosmogenic
Neutron
Software package for simulating nuclear processes
typically used, although group-wise data also are available. In MCNP neutron transport calculations, all reactions given in a particular cross-section evaluation
Monte Carlo N-Particle Transport Code
Monte_Carlo_N-Particle_Transport_Code
Mathematical physicist (b. 1929, d. 2017)
and the mathematical development of linear transport theory, a discipline that encompasses neutron transport in the core of a nuclear reactor as well as
Paul_Frederick_Zweifel
Transport code
fusion neutronics and radiation shielding. In addition to the original neutron transport capabilities, Serpent is able to perform photon transport. Leppänen
Serpent_(software)
Physical phenomenon
Neutron scattering, the irregular dispersal of free neutrons by matter, can refer to either the naturally occurring physical process itself or to the man-made
Neutron_scattering
Collapsed core of a massive star
A neutron star is the gravitationally collapsed core of a massive supergiant star. It results from the supernova explosion of a massive star—combined
Neutron_star
Probability that a high-energy neutron is not captured
formula. To compute it, neutron transport theory is used. The nucleus can capture a neutron only if the kinetic energy of the neutron is close to the energy
Resonance_escape_probability
Technique to investigate atomic structures using neutron scattering
Neutron diffraction or elastic neutron scattering is the application of neutron scattering to the determination of the atomic and/or magnetic structure
Neutron_diffraction
21st-century assassination campaign
"Darioush Rezaei," a physics professor whose area of expertise was neutron transport, and who was linked to Iran's nuclear program. The victim was subsequently
Assassinations of Iranian nuclear scientists
Assassinations_of_Iranian_nuclear_scientists
transfer Neutron transport Case, Kenneth; Zweifel, Paul (1967), Linear Transport Theory, Addison-Wesley Davison, Boris (1957), Neutron Transport Theory
Linear_transport_theory
American chemist (1873-1951)
scientists who made use of this cyclotron was Enrico Fermi, who performed neutron transport experiments. Since 1978, the magnet yoke of the cyclotron Harkins
William_Draper_Harkins
Ionizing radiation that presents as free neutrons
Neutron radiation is a form of ionizing radiation that presents as free neutrons. Typical phenomena are nuclear fission or nuclear fusion causing the release
Neutron_radiation
Methods for solving differential equations
1973 Reed and Hill introduced a DG method to solve the hyperbolic neutron transport equation. The origin of the DG method for elliptic problems cannot
Discontinuous_Galerkin_method
Substance that slows down particles with no electric charge
engineering, a neutron moderator is a medium that reduces the speed of fast neutrons, ideally without capturing any, leaving them as thermal neutrons with only
Neutron_moderator
Smallest amount of fissile material needed to sustain a nuclear reaction
neutron population. A numerical measure of a critical mass depends on the effective neutron multiplication factor k, the average number of neutrons released
Critical_mass
Device that emits neutrons
A neutron source is any device that emits neutrons, irrespective of the mechanism used to produce the neutrons. Neutron sources are used in physics, engineering
Neutron_source
the grid are found in fields such as computational chemistry and neutron transport. The surface integral of a function over the unit sphere, I [ f ]
Lebedev_quadrature
Kinetic energy of an unbound neutron
The neutron detection temperature, also called the neutron energy, indicates a free neutron's kinetic energy, usually given in electron volts. The term
Neutron_temperature
Atomic nuclear process
Neutron capture is a nuclear reaction in which an atomic nucleus and one or more neutrons collide and merge to form a heavier nucleus. Since neutrons
Neutron_capture
In the theory of radiative transfer, of either thermal or neutron radiation, a position and direction-dependent intensity function is usually sought for
Discrete_ordinates_method
three axis spectroscopy) is a technique used in conjunction with inelastic neutron scattering. The instrument is referred to as triple-axis spectrometer (also
Neutron triple-axis spectrometry
Neutron_triple-axis_spectrometry
Creating a complex 3D surface or object by combining primitive objects
Clara.io Geant4 Magica CSG MCNP OpenMC - Monte Carlo Photon and Neutron Transport Code SketchUp Womp Foley, James D. (1996), "12.7 Constructive Solid
Constructive_solid_geometry
French physicist
experiments under Frédéric Joliot-Curie. At the CEA he worked on neutron transport experiments and research and development of different type of reactors
Georges_Vendryes
Italian nuclear engineer
co-author of the MCNPX-PoliMi code for Monte Carlo simulation of neutron transport and nuclear fission, and she studies methods for detecting nuclear
Sara_Pozzi
Induction of radioactivity by neutron radiation
Neutron activation is the process in which neutron radiation induces radioactivity in materials, and occurs when atomic nuclei capture free neutrons, becoming
Neutron_activation
Italian-American physicist (1901–1954)
radioactive elements produced by neutron irradiation, and for his related discovery of nuclear reactions brought about by slow neutrons". He has been called the
Enrico_Fermi
Multi-stage fusion-fission nuclear weapon
temperatures. Unlike fission weapons, whose detonations are mediated via neutron transport, thermonuclear yield is more directly dependent on the temperatures
Thermonuclear_weapon
Austrian mathematician and theoretical physicist (1844–1906)
re-entry in the upper atmosphere. It is the basis for neutron transport theory, and ion transport in semiconductors. Boltzmann's work in statistical mechanics
Ludwig_Boltzmann
Academic journal
problems in life applications. The need, such as, ballistics prediction, neutron transport, and nonsteady, multidimensional fluid dynamics pushed the development
SIAM Journal on Scientific Computing
SIAM_Journal_on_Scientific_Computing
Phenomenon in nuclear engineering
transient can also be observed in some special case Monte Carlo neutron transport simulation codes. Reuss, Paul (2008). Neutron Physics. pp. 213–214. v t e
Placzek_transient
Mathematical physicist (1908–1961)
Neutron Transport Theory. Davison died suddenly at his home in Toronto on 24 January 1961 at the age of 52. Boris, Davison (1957). Neutron Transport Theory
Boris_Davison
Industrial shift to information technology
computers continued in the late 1940s and beyond, with FERMIAC for neutron transport, Project Cyclone for various military applications, and the Phillips
Information_Age
Device for controlled nuclear reactions
single neutrons and split, releasing energy and multiple neutrons, which can induce further fission. Reactors stabilize this, regulating neutron absorbers
Nuclear_reactor
Type of nuclear reactor cooled by molten salt
simulation software for modeling reactor core conditions, neutronics, and neutron transport, including in liquid fueled reactors where the fuel circulates
Molten-salt_reactor
Neutron tomography is a form of computed tomography involving the production of three-dimensional images by the detection of the absorbance of neutrons
Neutron_tomography
Topics referred to by the same term
Pseudoalteromonas phenolica MC21-A MC21-B MC21, a Monte-Carlo code; see Neutron transport Search for "mc21" , "mc-21", "mc-2-1", "m-c-21", or "m-c-2-1" on Wikipedia
MC21
Neutron detection is the effective detection of neutrons entering a well-positioned detector. There are two key aspects to effective neutron detection:
Neutron_detection
Computation machine that uses continuously varying data technology
invented by physicist Enrico Fermi in 1947 to aid in his studies of neutron transport. Project Cyclone was an analog computer developed by Reeves in 1950
Analog_computer
Multi-disciplinary research facility in Lund, Sweden
and magnetic properties, which are more challenging to probe with other neutron sources in terms of lengths and time scales. The research facility is located
European_Spallation_Source
Symbols for constants, special functions
susceptibility of a material in physics the fission neutron energy spectrum in neutron transport Ψ {\displaystyle \Psi } represents: a quaternary combinator
Greek letters used in mathematics, science, and engineering
Greek_letters_used_in_mathematics,_science,_and_engineering
French mathematician (born 1969)
activity. The kinetic framework also arises in many other fields: neutron transport, radiative transfer, and biology. He is interested in asymptotic analysis
Thierry_Goudon
Special function defined by an integral
unsteady state flow with line sources and sinks Solutions to the neutron transport equation in simplified 1-D geometries Solutions to the Trachenko–Zaccone
Exponential_integral
Proposed rocket propulsion mechanism
question can be perhaps answered by detailed Monte Carlo simulations of neutron transport.[according to whom?] The vessel's exhaust would contain radioactive
Nuclear_salt-water_rocket
Chinese nuclear physicist (1924–1986)
research on detonation physics, fluid mechanics, equation of state, neutron transport, etc., conducted a large number of simulation calculations and analyzes
Deng_Jiaxian
December 17, 2025. "GitHub - mccode-dev/McCode: The home of the McStas (neutrons) and McXtrace (x-rays) Monte-Carlo ray-tracing instrument simulation codes"
List of computational physics software
List_of_computational_physics_software
Interferometer using neutron diffraction to make precise measurements
In physics, a neutron interferometer is an interferometer capable of diffracting neutrons, allowing the wave-like nature of neutrons, and other related
Neutron_interferometer
Type of bacterial motion
biology—for example, in idealized models of radiative transfer and neutron transport. Animal navigation – Ability of many animals to find their way accurately
Run-and-tumble_motion
Dutch mathematician (1922–1999)
treatment of topics in nuclear physics (e.g. neutron transport) and astrophysics (e.g. radiation transport within stars). Afterwards he worked with Rutger
Gerrit_Lekkerkerker
Free neutrons stored in very small traps
Ultracold neutrons (UCN) are free neutrons which can be stored in traps made from certain materials. The storage is based on the reflection of UCN by such
Ultracold_neutrons
American physicist, biologist and mountaineer (1926–2000)
first thermonuclear weapon. Bell contributed by solving problems of neutron transport. Such problems are also crucial in the design and analysis of nuclear
George_Irving_Bell
Neutron backscattering is one of several inelastic neutron scattering techniques. Backscattering from monochromator and analyzer crystals is used to achieve
Neutron_backscattering
Method used for determining the concentrations of elements in many materials
Neutron activation analysis (NAA) is a nuclear process used for determining the concentrations of elements in many materials. NAA allows discrete sampling
Neutron_activation_analysis
Neutron reflectometry is a neutron diffraction technique for measuring the structure of thin films, similar to the often complementary techniques of X-ray
Neutron_reflectometry
Iranian nuclear scientist and physicist (1966–2010)
in November 2010, allegedly by Israel's Mossad. He specialized in neutron transport, a phenomenon that lies at the heart of nuclear chain reactions in
Majid_Shahriari
Measure of neutron interaction likelihood
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
Neutron_cross_section
Accelerator-based neutron source in Oak Ridge, Tennessee, US
Spallation Neutron Source (SNS) is an accelerator-based neutron source facility in the U.S. that provides the most intense pulsed neutron beams in the
Spallation_Neutron_Source
French mathematician (1928–2023)
implosions, thermonuclear reactions, non-linear neutronics of high velocity media of nuclei making the neutron transport and plasma physics equations non-linear
Robert_Dautray
Substance that can be converted into material for use in nuclear fission
although not fissile itself, can be converted into a fissile material by neutron absorption. Naturally occurring fertile materials that can be converted
Fertile_material
Material analysis technique
Small-angle neutron scattering (SANS) is an experimental technique that uses elastic neutron scattering at small scattering angles to investigate the structure
Small-angle neutron scattering
Small-angle_neutron_scattering
German mathematician (1926–1974)
Jörgens, Konrad (1958). "An asymptotic expansion in the theory of neutron transport". Comm. Pure Appl. Math. 11 (2): 219–242. doi:10.1002/cpa.3160110206
Konrad_Jörgens
Research facility in Oxfordshire, England
The ISIS Neutron and Muon Source is a pulsed neutron and muon source at the Rutherford Appleton Laboratory (RAL) of the Science and Technology Facilities
ISIS_Neutron_and_Muon_Source
Early 2010s fusion energy effort
Boyd, John K.; Powers, Jeffrey J.; Seifried, Jeffrey E. (2009). "Neutron Transport and Nuclear Burnup Analysis for the Laser Inertial Confinement Fusion-Fission
Laser_Inertial_Fusion_Energy
Neutron scattering technique
Neutron spin echo spectroscopy is an inelastic neutron scattering technique invented by Ferenc Mezei in the 1970s and developed in collaboration with John
Neutron_spin_echo
Physics research institute in Russia
synchrophasotron (4 GeV). The site has a neutron fast-pulse reactor (1,500MW pulse) with nineteen associated instruments receiving neutron beams. The Joint Institute
Joint Institute for Nuclear Research
Joint_Institute_for_Nuclear_Research
Highly-polished material in particle physics
A neutron supermirror is a highly polished, layered material used to reflect neutron beams. Supermirrors are a special case of multi-layer neutron reflectors
Neutron_supermirror
Chemical element with atomic number 94 (Pu)
low-speed "thermal" neutrons, so that after the second cycle, the plutonium can only be consumed by fast neutron reactors. If fast neutron reactors are not
Plutonium
American mathematician (1923–2016)
503–510. Edward W. Larsen and Joseph B. Keller. Asymptotic solution of neutron transport problems for small mean free paths. J. Mathematical Phys. 15 (1974)
Joseph_Keller
A neutron research facility is most commonly a big laboratory operating a large-scale neutron source that provides thermal neutrons to a suite of research
Neutron_research_facility
Jerome; Gelbard, Ely M. (2008). "Importance Sampling". Monte Carlo Principles and Neutron Transport Problems. Dover. pp. 110–124. ISBN 978-0-486-46293-6.
Monte Carlo method in statistical mechanics
Monte_Carlo_method_in_statistical_mechanics
Uses of an apparent lack of pattern or predictability in events
computer simulation of physical phenomena, notably simulation of neutron transport in nuclear fission. Pseudo-random numbers are frequently used in simulation
Applications_of_randomness
Theoretical matter within neutron stars
the crusts of neutron stars. If it exists, nuclear pasta would be the strongest material in the universe. Between the surface of a neutron star and the
Nuclear_pasta
Partial differential equation
equation Ornstein–Uhlenbeck process Wiener process Linear transport theory Neutron transport Tong, David. "Stochastic Processes" (PDF). Kramers, H.A. (1940)
Klein–Kramers_equation
Turkish politician
Middle East Technical University (1960–1966). He initiated research on neutron transport during that period. Between 1969 and 1971, he was the dean of the
Erdal_İnönü
American engineering scientist (born 1943)
of Neutron Transport. American Nuclear Society. ISBN 0-89448-452-4. Energy portal United States portal United States Department of Energy Neutron transport
Warren_F._Miller_Jr.
Russian mathematician (1930–2010)
several books, most noticeably "Numerical methods in the theory of neutron transport" jointly with Gury Marchuk and "Functional Analysis in Computational
Vyacheslav Lebedev (mathematician)
Vyacheslav_Lebedev_(mathematician)
Pakistani nuclear engineer (1926–1999)
nuclear reactor physics, specifically determining neutron transport and the interaction of neutrons within the reactor, was widely recognized and he was
Munir_Ahmad_Khan
Nuclear reactor where fast neutrons maintain a fission chain reaction
sustained by fast neutrons (carrying energies above 1 MeV, on average), as opposed to slow thermal neutrons used in thermal-neutron reactors. Such a fast
Fast-neutron_reactor
Effects of thermal limits on nuclear operations
single aspects of reactor physics, multiphysics models integrate neutron transport, heat conduction, and fluid dynamics into a unified framework. This
Thermal_limits_(nuclear)
German nuclear research reactor
The Research Neutron Source Heinz Maier-Leibnitz (Forschungsreaktor München II or FRM II) (German: Forschungs-Neutronenquelle Heinz Maier-Leibnitz) is
FRM_II
Prompt-gamma neutron activation analysis (PGAA) is a very widely applicable technique for determining the presence and amount of many elements simultaneously
Prompt gamma neutron activation analysis
Prompt_gamma_neutron_activation_analysis
Chemical element with atomic number 98 (Cf)
rapid depletion by reaction with another neutron (high neutron cross section). 252Cf is a very strong neutron emitter, which makes it an extremely hazardous
Californium
Matter ejection from a target due to projectile impact
spallation neutron is six times lower than that of a neutron gained via nuclear fission. In contrast to nuclear fission, the spallation neutrons cannot trigger
Spallation
Neutron time-of-flight scattering is a form of inelastic neutron scattering. It can be pulsed or continuous. In the pulsed version, the incoming neutron
Neutron time-of-flight scattering
Neutron_time-of-flight_scattering
Internationally financed scientific facility
metals. Neutron diffraction Small angle neutron scattering Neutron reflectometry Inelastic neutron scattering Neutron triple-axis spectrometry Neutron time-of-flight
Institut_Laue–Langevin
Research reactor in Daejeon, South Korea
The High-Flux Advanced Neutron Application Reactor (HANARO; Korean: 하나로) is a 30 MW multi-purpose research reactor located at Daejeon, Republic of Korea
High-Flux Advanced Neutron Application Reactor
High-Flux_Advanced_Neutron_Application_Reactor
Research institute specializing in computational mathematics
energy, the institute was also involved in modelling of processes of neutron transport and nuclear reactions. In particular, E. Kuznetsov is known for his
Keldysh Institute of Applied Mathematics
Keldysh_Institute_of_Applied_Mathematics
Medical intervention
Fast neutron therapy utilizes high energy neutrons typically between 50 and 70 MeV to treat cancer. Most fast neutron therapy beams are produced by reactors
Fast_neutron_therapy
American public spaceflight company
hypersonic technology development, while the next-generation reusable Neutron medium-lift launch vehicle is in development to support constellation deployment
Rocket_Lab
Early computer built by the Oak Ridge National Laboratory
nuclear-aircraft programs. Householder's Mathematics Panel applied it to neutron transport, radiation shielding and reactor-physics problems, and it was reported
ORACLE_(computer)
A neutron-velocity selector is a device that allows neutrons of defined velocity to pass while absorbing all other neutrons, to produce a monochromatic
Neutron-velocity_selector
American physicist and mathematician
well-known physicists. Case developed new methods for calculating neutron transport and for estimating the explosive yield of bomb designs. After the
Kenneth_Case
with information related to the initiation of high explosives and to neutron transport calculations until 25 August, but it failed to address these issues
Negotiations leading to the Iran nuclear deal
Negotiations_leading_to_the_Iran_nuclear_deal
Naturally occurring uranium self-sustaining nuclear chain reactions
with 235 U and due to it being both consumed by neutron capture and produced from 235 U by fast-neutron-induced (n,2n) reactions in nuclear reactors. In
Natural nuclear fission reactor
Natural_nuclear_fission_reactor
Functions for thermal radiation in hot enclosures
practical applications in several engineering problems related to transport of thermal or neutron, radiation in systems with special symmetries (e.g. spherical
Bickley–Naylor_functions
Electricity generation by nuclear fusion
known as DT fusion. This reaction forms a helium nucleus and an energetic neutron. Fusion fuel is extremely energy-dense, but tritium is scarce on Earth
Fusion_power
electric dipole moment (EDM) of the neutron to a precision of ~10−28ecm. The name is an abbreviation of cryogenic neutron EDM experiment. The previous name
CryoEDM
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