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{adj: exotic} strikingly strange or unusual
"an exotic hair style"
"protons, neutrons, electrons and all their exotic variants"
"the exotic landscape of a dead planet"

{n: Brockhouse, Bertram Brockhouse} Canadian physicist who bounced neutron beams off of atomic nuclei to study the structure of matter (1918-2003)

{n: Fermi, Enrico Fermi} Italian nuclear physicist (in the United States after 1939) who worked on artificial radioactivity caused by neutron bombardment and who headed the group that in 1942 produced the first controlled nuclear reaction (1901-1954)

{n: Pauli exclusion principle, exclusion principle} no two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers

{n: antineutron} the antiparticle of a neutron

{n: boron chamber} an ionization chamber lined with boron or filled with boron trifluoride gas for counting low velocity neutrons

{n: boron counter tube} a proportional counter tube for counting neutrons

{n: chain reaction} a self-sustaining nuclear reaction; a series of nuclear fissions in which neutrons released by splitting one atom leads to the splitting of others

{n: corpuscular radiation, particulate radiation} a stream of atomic or subatomic particles that may be charged positively (e.g. alpha particles) or negatively (e.g. beta particles) or not at all (e.g. neutrons)

{n: deuterium, heavy hydrogen} an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen)

{n: deuteron} the nucleus of deuterium; consists of one proton and one neutron; used as a bombarding particle in accelerators

{n: einsteinium, Es, E, atomic number 99} a radioactive transuranic element produced by bombarding plutonium with neutrons

{n: fast reactor} nuclear reactor in which nuclear fissions are caused by fast neutrons because little or no moderator is used
<-> thermal reactor

{n: fermium, Fm, atomic number 100} a radioactive transuranic metallic element produced by bombarding plutonium with neutrons

{n: hyperon} any baryon that is not a nucleon; unstable particle with mass greater than a neutron

{n: isotope} one of two or more atoms with the same atomic number but with different numbers of neutrons

{n: mass number, nucleon number} the sum of the number of neutrons and protons in an atomic nucleus

{n: moderator} any substance used to slow down neutrons in nuclear reactors

{n: neutron bomb} atom bomb that produces lethal neutrons with less blast

{n: neutron flux} the rate of flow of neutrons; the number of neutrons passing through a unit area in unit time

{n: neutron radiation} radiation of neutrons (as by a neutron bomb)

{n: neutron star} a star that has collapsed under its own gravity; it is composed of neutrons

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

{n: nucleon} a constituent (proton or neutron) of an atomic nucleus

{n: plutonium, Pu, atomic number 94} a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239

{n: polonium, Po, atomic number 84} a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor

{n: pulsar} a degenerate neutron star; small and extremely dense; rotates very fast and emits regular pulses of polarized radiation

{n: quantum chromodynamics, QCD} a theory of strong interactions between elementary particles (including the interaction that binds protons and neutrons in the nucleus); it assumes that strongly interacting particles (hadrons) are made of quarks and that gluons bind the quarks together

{n: strong interaction, strong force, color force} (physics) the interaction that binds protons and neutrons together in the nuclei of atoms; mediated by gluons

{n: thermal reactor} a nuclear reactor in which nuclear fissions are caused by neutrons that are slowed down by a moderator
<-> fast reactor

{n: uranium 238} the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239

{n: zirconium, Zr, atomic number 40} a lustrous grey strong metallic element resembling titanium; it is used in nuclear reactors as a neutron absorber; it occurs in baddeleyite but is obtained chiefly from zircon

{v: capture} bring about the capture of an elementary particle or celestial body and causing it enter a new orbit
"This nucleus has captured the slow-moving neutrons"
"The star captured a comet"

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