Titre du document

Neutron capture chains in heavy element synthesis

Lien vers le document
Nom du Corpus

AstroConcepts

Auteur(s)
  • D.D Clayton 1
  • W.A Fowler 1
  • T.E Hull 1
  • B.A Zimmerman 1
Affiliation(s)
  • Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California, USA
Résumé

This paper is concerned with stellar neutron capture processes which occur at a rate slow compared to the intervening beta decays, the so-called s-process in the synthesis of the elements. An approximate method of high reliability has been devised to solve for the abundance distributions resulting from the exposure of seed nuclei, such as Fe56, to a weak neutron flux in stars. The capture chain differential equations are solved by approximately matching the Laplace transforms of the exact solutions to the Laplace transform of an easily calculable function. From the sequence of abundance distributions generated in this manner for specified numbers of neutrons per initial seed nucleus, one can estimate the superpositions of neutron exposures required to reproduce the experimentally observed abundance distribution for the s-process isotopes of the elemments. Not only can the validity of the s-process model of heavy element synthesis in stellar interiors be demonstrated in this way, but certain inferences about the “history” of stellar neutron processes also appear. Special attention is paid in this regard to the “terminal” exposures which have synthesized lead and bismuth at the end of the line in the s-process. An analysis is appended of neutron capture cross sections near 25 kev for the s-process nuclei, including interpolations based upon empirical cross sections guided where necessary by isotopic and elemental abundances. A complete correlation between neutron capture cross sections and s-process abundances cannot be made at the present stage of knowledge, but the methods described will lead to an eventual solution as more empirical information becomes available.

Langue(s) du document
Anglais
Année de publication
1961
Revue

Annals of Physics

Éditeur
Elsevier
Type de publication
journal
Type de document
research-article
Présence de XML structuré
Non
Version de PDF
1.3
Score de qualité du texte
10
Nom du concept
  • CNO cycles
  • Nucleosynthesis
Catégories Science-Metrix
  • 1 - natural sciences ; 2 - physics & astronomy ; 3 - nuclear & particles physics
Catégories Inist
  • 1 - sciences appliquees, technologies et medecines ; 2 - sciences biologiques et medicales ; 3 - sciences biologiques fondamentales et appliquees. psychologie ; 4 - invertebres
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Physics and Astronomy ; 3 - General Physics and Astronomy
Catégories WoS
  • 1 - science ; 2 - physics, multidisciplinary
Identifiant ISTEX
38FB82B0CE3E1E18EBD0DB582F6C9847EDB0682A
ark:/67375/6H6-RM51CZSJ-B
Powered by Lodex 9.4.5