thermal neutron
41Neutron moisture gauge — A neutron moisture meter is a moisture meter utilizing neutron scattering. The meters are most frequently used to measure the water content in soil or rock. The technique is non destructive, and is sensitive to moisture in the bulk of the target… …
42neutron optics — ▪ physics branch of physics dealing with the theory and applications of the wave behaviour (wave particle duality) of neutrons (neutron), the electrically neutral subatomic particles that are present in all atomic nuclei except those of… …
43neutron — An electrically neutral particle in the nuclei of all atoms (except hydrogen 1) with a mass slightly larger than that of a proton; in isolation, it has a half life of about 10.3 minutes. [L. neuter, neither] epithermal n. a n. having an energy in …
44neutron temperature — /njutrɒn ˈtɛmprətʃə/ (say nyoohtron tempruhchuh) noun the energy of neutrons, in thermal equilibrium with their surroundings, expressed as a temperature on the assumption that they behave as a monatomic gas …
45Free neutron — Elementbox name=neutron number=0 symbol=n0 left= right=hydrogen above= below=helium series=noble gas group=18 period=0 block= appearance=colourless atomic mass= [1] electron configuration=0s0 electrons per shell=0 phase=gas density gplstp=… …
46Formation evaluation neutron porosity — In the field of formation evaluation, porosity is one of the key measurements to quantify an oil and gas reserves. Neutron porosity measurement employs neutron source to measure hydrogen index in a reservoir, which is directly related to porosity …
47Fast neutron reactor — [ Shevchenko BN350 nuclear fast reactor and desalination plant situated on the shore of the Caspian Sea. The plant generates 135 MWe and provides steam for an associated desalination plant. View of the interior of the reactor hall.] A fast… …
48Prompt neutron — In nuclear engineering, a prompt neutron is a neutron immediately emitted by a nuclear fission event, as opposed to a delayed neutron decay which can occur within the same context, emitted by one of the fission products anytime from a few… …
49Delayed neutron — In nuclear engineering, a delayed neutron is a neutron emitted after a nuclear fission event by one of the fission products anytime from a few milliseconds to a few minutes later, similar to a prompt neutron decay which can occur within the same… …
50Startup neutron source — RBMK reactor control rod positions at the moment of the Chernobyl disaster; blue=startup neutron sources (12), yellow=shortened control rods from the reactor bottom (32), grey=pressure tubes (1661), green=control rods (167), red=automatic control …
