A seed nucleus is an isotope that is the starting point for any of a variety of fusion chain reactions. The mix of nuclei produced at the conclusion of the chain reaction generally depends strongly on the relative availability of the seed nucleus or nuclei and the component being fused--whether neutrons as in the r-process and s-process or protons as in the rp-process. A smaller proportion of seed nuclei will generally result in products of larger mass, whereas a larger seed-to-neutron or seed-to-proton ratio will tend to produce comparatively lighter masses.
Famous quotes containing the words seed and/or nucleus:
“Punishment is a fruit that unsuspected ripens within the flower of the pleasure which concealed it. Cause and effect, means and ends, seed and fruit, cannot be severed; for the effect already blooms in the cause, the end preexists in the means, the fruit in the seed.”
—Ralph Waldo Emerson (1803–1882)
“Just see how it glints and sparkles. Of course it is a nucleus and focus of crime. Every good stone is. They are the devil’s pet baits. In larger and older jewels every facet may stand for a bloody deed....”
—Sir Arthur Conan Doyle (1859–1930)