engineering, a prompt neutron is a neutron immediately emitted (neutron emission) by a nuclear fission event, as opposed to a delayed neutron decay which...

engineering, prompt criticality is the criticality (the state in which a nuclear chain reaction is self-sustaining) that is achieved with prompt neutrons alone...

prompt neutrons would alone, as these delayed neutrons effectively increase the mean neutron lifetime l {\displaystyle l} . Without delayed neutrons,...

minutes later. These neutrons are emitted by excited daughter nuclei of certain beta-decaying fission products. In contrast, prompt neutrons are emitted almost...

induces fission in a nucleus. Consider only prompt neutrons, and let ν denote the number of prompt neutrons generated in a nuclear fission. For example...

nucleons. Most neutron emission outside prompt neutron production associated with fission (either induced or spontaneous), is from neutron-heavy isotopes...

Prompt-gamma neutron activation analysis (PGAA) is a very widely applicable technique for determining the presence and amount of many elements simultaneously...

containing Prompt Prompt neutron, in nuclear engineering Prompt criticality This disambiguation page lists articles associated with the title Prompt. If an...

"Solar Gamma Ray and Neutron Observations". NASA Special Publication. 342: 285. Bibcode:1973NASSP.342..285C. Prompt Gamma-ray Neutron Activation Analysis...

variants. All nuclear weapons up to about 10 kilotons in yield have prompt neutron radiation as their furthest-reaching lethal component. For standard...

the reactivity of both the prompt and delayed neutrons. However, reactivity in dollars is dependent on the delayed neutron fraction (βeff). Reactivity...

"5 MeV" is released in prompt or initial gamma radiation, "5 MeV" in prompt neutron radiation (99.36% of total), "7 MeV" in delayed neutron energy (0.64%) and...

during neutron irradiation (prompt gamma), or at some time after irradiation (delayed gamma, DGNAA). PGNAA is generally performed by using a neutron stream...

properties, detection of neutrons fall into several major categories: Absorptive reactions with prompt reactions - low energy neutrons are typically detected...

delayed neutrons. In such cases, the neutron population can rapidly increase exponentially, with a very small time constant, known as the prompt neutron lifetime...

one of its neutrons. In nuclear engineering, a prompt neutron is a neutron immediately emitted by a nuclear fission event. Prompt neutrons emerge from...

cross section for slow thermal neutrons is about 584.3±1 barns. For fast neutrons it is on the order of 1 barn. Most neutron absorptions induce fission,...

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...

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...

The neutron detection temperature, also called the neutron energy, indicates a free neutron's kinetic energy, usually given in electron volts. The term...

three neutrons, and these neutrons can be absorbed by uranium-238 to produce plutonium-239 and other isotopes. Plutonium-239 can also absorb neutrons and...

at the optimal moment when the configuration is prompt critical. It is also known as an internal neutron initiator. The initiator is typically placed in...

meaning a total of 4 neutrons needed to trigger fission). 233U usually fissions on neutron absorption, but sometimes retains the neutron, becoming uranium-234...

prompt and delayed neutron yield fractions to obtain the average neutron lifetime, Λ=l/k, or the mean generation time between the birth of a neutron and...

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 activation is the process in which neutron radiation induces radioactivity in materials, and occurs when atomic nuclei capture free neutrons, becoming...

ongoing research into neutron microscopy and neutron/gamma ray tomography. A major use of neutrons is to excite delayed and prompt gamma rays from elements...

{\displaystyle I_{\text{sp}}} amplification, only the energy from prompt neutrons, and some prompt gamma energy, is used for this purpose. The rest of the energy...

intended to demonstrate how close the core was to criticality, using a neutron-reflective tamper (layer of dense material surrounding the fissile material)...

the shutdown. Most neutrons in a reactor are prompt neutrons; that is, neutrons produced directly by a fission reaction. These neutrons move at a high velocity...