Seed nucleus

Seed nucleus

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.


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  • Nucleus — Nu cle*us, n.; pl. E. {Nucleuses}, L. {Nuclei}. [L., a kernel, dim. fr. nux, nucis, nut. Cf. {Newel} post.] [1913 Webster] 1. A kernel; hence, a central mass or point about which matter is gathered, or to which accretion is made; the central or… …   The Collaborative International Dictionary of English

  • Seed — (s[=e]d), n.; pl. {Seed} or {Seeds}. [OE. seed, sed, AS. s[=ae]d, fr. s[=a]wan to sow; akin to D. zaad seed, G. saat, Icel. s[=a][eth], s[ae][eth]i, Goth. manas[=e][thorn]s seed of men, world. See {Sow} to scatter seed, and cf. {Colza}.] 1.… …   The Collaborative International Dictionary of English

  • Seed — (s[=e]d), n.; pl. {Seed} or {Seeds}. [OE. seed, sed, AS. s[=ae]d, fr. s[=a]wan to sow; akin to D. zaad seed, G. saat, Icel. s[=a][eth], s[ae][eth]i, Goth. manas[=e][thorn]s seed of men, world. See {Sow} to scatter seed, and cf. {Colza}.] 1.… …   The Collaborative International Dictionary of English

  • Seed bag — Seed Seed (s[=e]d), n.; pl. {Seed} or {Seeds}. [OE. seed, sed, AS. s[=ae]d, fr. s[=a]wan to sow; akin to D. zaad seed, G. saat, Icel. s[=a][eth], s[ae][eth]i, Goth. manas[=e][thorn]s seed of men, world. See {Sow} to scatter seed, and cf.… …   The Collaborative International Dictionary of English

  • Seed bud — Seed Seed (s[=e]d), n.; pl. {Seed} or {Seeds}. [OE. seed, sed, AS. s[=ae]d, fr. s[=a]wan to sow; akin to D. zaad seed, G. saat, Icel. s[=a][eth], s[ae][eth]i, Goth. manas[=e][thorn]s seed of men, world. See {Sow} to scatter seed, and cf.… …   The Collaborative International Dictionary of English

  • Seed coat — Seed Seed (s[=e]d), n.; pl. {Seed} or {Seeds}. [OE. seed, sed, AS. s[=ae]d, fr. s[=a]wan to sow; akin to D. zaad seed, G. saat, Icel. s[=a][eth], s[ae][eth]i, Goth. manas[=e][thorn]s seed of men, world. See {Sow} to scatter seed, and cf.… …   The Collaborative International Dictionary of English

  • Seed corn — Seed Seed (s[=e]d), n.; pl. {Seed} or {Seeds}. [OE. seed, sed, AS. s[=ae]d, fr. s[=a]wan to sow; akin to D. zaad seed, G. saat, Icel. s[=a][eth], s[ae][eth]i, Goth. manas[=e][thorn]s seed of men, world. See {Sow} to scatter seed, and cf.… …   The Collaborative International Dictionary of English

  • Seed down — Seed Seed (s[=e]d), n.; pl. {Seed} or {Seeds}. [OE. seed, sed, AS. s[=ae]d, fr. s[=a]wan to sow; akin to D. zaad seed, G. saat, Icel. s[=a][eth], s[ae][eth]i, Goth. manas[=e][thorn]s seed of men, world. See {Sow} to scatter seed, and cf.… …   The Collaborative International Dictionary of English

  • Seed drill — Seed Seed (s[=e]d), n.; pl. {Seed} or {Seeds}. [OE. seed, sed, AS. s[=ae]d, fr. s[=a]wan to sow; akin to D. zaad seed, G. saat, Icel. s[=a][eth], s[ae][eth]i, Goth. manas[=e][thorn]s seed of men, world. See {Sow} to scatter seed, and cf.… …   The Collaborative International Dictionary of English

  • Seed eater — Seed Seed (s[=e]d), n.; pl. {Seed} or {Seeds}. [OE. seed, sed, AS. s[=ae]d, fr. s[=a]wan to sow; akin to D. zaad seed, G. saat, Icel. s[=a][eth], s[ae][eth]i, Goth. manas[=e][thorn]s seed of men, world. See {Sow} to scatter seed, and cf.… …   The Collaborative International Dictionary of English

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