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Longman Dictionary of Contemporary English
a neutron bomb (=that kills people but does not damage buildings much)
neutron bomb
▪ This is where neutron activation analysis enables us to source them with certainty.
▪ He has his forensic pathology run-down, his neutron activation analysis.
▪ Analytical techniques such as atomic absorption spectrophotometry and neutron activation analysis may be required for quantitative determination at such low levels.
▪ In another analytical method, neutron activation, an atomic reactor is used to bombard the mineral with fast-moving neutrons.
▪ Quarried blocks of marble and finished sculptures have been analysed by neutron activation and the results have been very encouraging.
▪ One of these techniques is neutron activation analysis.
▪ The use of neutron activation analysis is best explained by the following case study.
▪ This dish has a Valencian shape but the crowded design is Malagan; neutron activation analysis shows it to be Valencian.
▪ He spent some time expressing his preference, for tactical reasons, for smaller neutron bombs before developing his argument.
▪ This is about a factor of 3 smaller than current best estimates of the neutron star radius.
▪ Despite such small size, a neutron star can contain as much mass as 500, 000 Earthsized planets.
▪ They were therefore called neutron stars.
▪ It is also too large a mass to be a neutron star.
▪ In this context, a neutron star is effectively a single atomic nucleus.
▪ It is highly relevant to ask what values have been measured for neutron star masses; do they fall in with expectation?
▪ In the standard formation model, millisecond pulsars are formed when a neutron star accretes matter from an evolving companion.
▪ Another such state is a neutron star.
▪ They were therefore called neutron stars.
▪ But there would be some D-D reactions in a reactor filled with deuterium and helium-3, which do produce neutrons.
▪ Each U-235 nucleus that decays spontaneously emits two large but unequal fragments, plus several neutrons.
▪ First, then, what about neutron decay?
▪ In another analytical method, neutron activation, an atomic reactor is used to bombard the mineral with fast-moving neutrons.
▪ Quarks unite to form protons, neutrons and electrons, which in turn unite to form atoms.
▪ Then they saw Jones' underground laboratory, the neutron spectrometer and its data, which were much more extensive than theirs.
▪ These stars would be supported by the exclusion principle repulsion between neutrons and protons, rather than between electrons.
▪ They were therefore called neutron stars.
▪ This is about a factor of 3 smaller than current best estimates of the neutron star radius.
Douglas Harper's Etymology Dictionary

"electrically neuter particle of the atom," 1921, coined by U.S. chemist William D. Harkins (1873-1951) from neutral (adj.) + -on. First record of neutron bomb is from 1960. Neutron star attested from 1934, originally hypothetical; so called because it would be composed of neutrons.


n. (context particle English) A subatomic particle forming part of the nucleus of an atom and having no charge; it is a combination of an up quark and two down quarks


n. an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus

Neutron (DC Comics)

Neutron is a fictional comic book supervillain in the DC Universe, appearing usually as an adversary of Superman.

Neutron (Marvel Comics)

Neutron is a fictional character, an extraterrestrial superhero that appears in comic books published by Marvel Comics.

Neutron (disambiguation)

Neutron is a subatomic particle.

Neutron may also refer to:

  • Neutron (bot), an XMPP bot written in Python using xmpppy library
  • Neutron (game), an abstract strategy game
  • Neutron (formerly Quantum), a software system for managing virtualized network topologies in the OpenStack cloud computing platform
Neutron (comics)

Neutron may refer to several comic book characters:

  • Neutron (DC Comics), a DC Comics character
  • Neutron (Linus), an Italian comics character from Linus
  • Neutron (Marvel Comics), a Marvel Comics character
Neutron (Linus)

Neutron is an Italian comic book series and the name of the eponymous main character created in 1965 by Guido Crepax. The series eventually became Valentina.


The neutron is a subatomic particle, symbol or , with no net electric charge and a mass slightly larger than that of a proton. Protons and neutrons, each with mass approximately one atomic mass unit, constitute the nucleus of an atom, and they are collectively referred to as nucleons. Their properties and interactions are described by nuclear physics.

The nucleus consists of Z protons, where Z is called the atomic number, and N neutrons, where N is the neutron number. The atomic number defines the chemical properties of the atom, and the neutron number determines the isotope or nuclide. The terms isotope and nuclide are often used synonymously, but they are chemical and nuclear concepts, respectively. The atomic mass number, symbol A, equals Z+N. For example, carbon has atomic number 6, and its abundant carbon-12 isotope has 6 neutrons, whereas its rare carbon-13 isotope has 7 neutrons. Some elements occur in nature with only one stable isotope, such as fluorine. Other elements occur as many stable isotopes, such as tin with ten stable isotopes. Even though it is not a chemical element, the neutron is included in the table of nuclides.

Within the nucleus, protons and neutrons are bound together through the nuclear force, and neutrons are required for the stability of nuclei. Neutrons are produced copiously in nuclear fission and fusion. They are a primary contributor to the nucleosynthesis of chemical elements within stars through fission, fusion, and neutron capture processes.

The neutron is essential to the production of nuclear power. In the decade after the neutron was discovered in 1932, neutrons were used to induce many different types of nuclear transmutations. With the discovery of nuclear fission in 1938, it was quickly realized that, if a fission event produced neutrons, each of these neutrons might cause further fission events, etc., in a cascade known as a nuclear chain reaction. These events and findings led to the first self-sustaining nuclear reactor ( Chicago Pile-1, 1942) and the first nuclear weapon ( Trinity, 1945).

Free neutrons, or individual neutrons free of the nucleus, are effectively a form of ionizing radiation, and as such, are a biological hazard, depending upon dose. A small natural "neutron background" flux of free neutrons exists on Earth, caused by cosmic ray showers, and by the natural radioactivity of spontaneously fissionable elements in the Earth's crust. Dedicated neutron sources like neutron generators, research reactors and spallation sources produce free neutrons for use in irradiation and in neutron scattering experiments.

Neutron (game)

Neutron is a two-player abstract strategy game invented by Robert A. Kraus. The game was first published in the Playroom section of Games & Puzzles 71 in July/August 1978. It is a game where each player moves two different pieces in a single turn without the use of dice. Games like Backgammon and Risk allow a player to move two or more different pieces in one turn, however, these games use dice. One other game that uses this concept is the L Game by Edward De Bono, and that game is also a modern invention.

There are 15 variants to this game. Neutron and some of its variants are some of the main games featured in Zillions of Games.

The game has been solved to some degree. Analysis has shown that the first player wins. It is unknown whether the other variants have been solved or not, and to what degree.

Usage examples of "neutron".

As always in his case, the human universe bent to accommodate him with the alacrity of a gravity field around a neutron star.

His first attempt in that direction involved the interaction of a neutron with a beryllium nucleus in such a way that two neutrons were liberated.

However, it took a fast energetic neutron to interact with the beryllium nucleus, and only slow neutrons were liberated, neutrons with too little energy to interact with further beryllium nuclei.

The tortured beryllium yielded up neutrons, which shot out in all directions through the uranium mass.

To split the first uranium nucleus by bombarding it with neutrons from the beryllium target took more power than the death of the atom gave up.

In order that the breeder pile continue to operate it was imperative that each atom split by a neutron from the beryllium target should cause the splitting of many more.

But as far back as 1950, hyperons had been discovered, elementary particles bigger than protons and neutrons.

They bombarded uranium with slow neutrons and split it up into masurium, barium, gamma rays and more neutrons, thus establishing a cyclic process.

Actually, that makes sense: neutrons decaying into protons and pions would transmute some of the calcium to scandium, the oxygen to fluorine, and the carbon to nitrogen.

Because we want to know the rate at which neutrons are being counted, we put in a sealer which can be started and stopped by electrical timing signals and then re-set.

Dragon on steel tables were a Geiger counter, a radiation graph that drew a red line on rolling paper, and a neutron sealer that measured radiation with a bank of six red lights.

It was a heavy isotope of hydrogen, with one proton and one neutron, and the Big Bang had made only a pinch of it, before stingily shutting off production just three minutes after creation.

The fission neutrons leak when subcritical, but when a reactor is critical, the number of fissions is constant since one reaction leads to another.

The Air had two main components, a neutron superfluid and an electron gas.

X-ray sources like Cyg X-l generally turned out to be: black holes or neutron stars that circled a blue supergiant companion, relentlessly sucking away its gases.