from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The electrically neutral nucleon, a baryon composed of two down quarks and one up quark, which has a mass 1,839 times that of an electron, is stable when bound in an atomic nucleus, but has a mean lifetime of 886 seconds as a free particle. It is a basic component of all atomic nuclei except the protium isotope of hydrogen.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics A
subatomic particleforming part of the nucleusof an atomand having no charge; it is a combination of an up quarkand two down quarks
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus
from The American Heritage® Dictionary of the English Language, 4th Edition
Apart from any surface contamination of the plant, the remaining radioactivity comes from "activation products" such as steel components that have been exposed to long-term neutron irradiation.
Cosmo – A long-term neutron measurement project, under the tutelage of the late Dr. Jack Lockwood and Dr. Jim Ryan of UNH's Physics Department, Institute for the Study of Earth, Oceans, and Space.
There were many problems in neutron diffusion such as finding the critical mass that required more careful formulations than had been carried out in the earliest projections.
USEEM: With the name neutron Jack, as in a neutron bomb, buildings are left standing but the people are gone.
About half of them found their careers in neutron scattering.
During a hectic period between 1955 and 1960 Brockhouse's pioneering work was without parallel within neutron spectroscopy.
With the crystal set at a suitable angle, a certain neutron wavelength can be selected.
On the other hand, if a neutron is emitted the product of the reaction is not a known atom.
The neutron is a heavy particle without any electric charge and of the same weight as the nucleus of an atom of hydrogen.
The existence of the neutron is however only a recent discovery.