Results 71 to 80 of about 307 (107)
Radiative Capture Reaction in the Stellar Interior and and Re/Os Cosmochronology
Soryushiron Kenkyu Electronics, 1999 openaire +1 more source
Annals of Physics, 1960 © 1960 Elsevier Inc. Supported in part by the joint program of the Office of Naval Research and the U. S. Atomic Energy Commission.
William Alfred Fowler, F Hoyle
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White Dwarf Cosmochronology in the Solar Neighborhood [PDF]
Astrophysical Journal, 2014 The study of the stellar formation history in the solar neighborhood is a powerful technique to recover information about the early stages and evolution of the Milky Way. We present a new method which consists of directly probing the formation history from the nearby stellar remnants.
Michele Cignoni +2 more
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A Nuclear Correction Factor for Re/Os Cosmochronology.
Astrophysical Journal, 1979 Modification of the laboratory cross sections for neutron capture on /sup 186/Os and /sup 187/Os caused by the excitation of these target nuclei to a thermal distribution of low-lying nuclear excited states is examined for temperatures appropriate to the stellar s-process (near 30 keV).
W A Fowler
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Operation of the r-Process and Cosmochronology
Physics Reports, 1993Abstract The rapid neutron capture process produced about half of the heavy elements in nature beyond the Fe-peak. In the past quite a number of astrophysical sites have been suggested, but none of them has yet been uniquely identified. Without assuming a particular site or model, we deduce the conditions responsible for the production of r-process ...
Friedrich-Karl Thielemann, K -L Kratz
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Th/Nd Cosmochronology and a Constant r/s Ratio [PDF]
Monthly Notices of the Royal Astronomical Society, 1989 Une serie de calculs numeriques est effectuee afin d'etudier la possibilite d'un effet de la metallicite sur l'exposition de neutrons pouvant expliquer la constance observee du rapport r/s (processus r/processus s) dans les etoiles avec [Fe/H]>−2.0. On trouve qu'un mecanisme base uniquement sur la dependance en metallicite de l'exposition de neutrons ...
Robert A. Malaney
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Nucleo-Cosmochronology and Chemical Evolution Modellings
Nuclear Physics A, 2003Abstract In an attempt to place nucleo-cosmochronology in perspective, we revisit the 187 Re- 187 Os chronometry with the use of a schematic two-zone model of chemical evolution in the solar neighbourhood and present some exemplifying results. We then elucidate the meaning of such chronometric studies, which rely on the isotopic abundances in the ...
Kohji Takahashi
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The Potential of White Dwarf Cosmochronology
Publications of the Astronomical Society of the Pacific, 2001In the light of recent significant progress on both the observational and theoretical fronts, we review the status of white dwarf stars as cosmochronometers. These objects represent the end products of stellar evolution for the vast majority of stars and, as such, can be used to constrain the ages of various populations of evolved stars in the Galaxy ...
G. Fontaine, P. Brassard, P. Bergeron
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Nuclear Cosmochronology Within Analytic Models of the Chemical Evolution of the Solar Neighbourhood [PDF]
Monthly Notices of the Royal Astronomical Society, 1988 This paper investigates whether the age of the Galaxy can be deduced from natural radioactivity. I demonstrate that two recent influential claims (by Butcher and by Fowler) that such observations set the age at TG = 10 Gyr depend on special assumptions that run counter to existing astrophysical theory, so that greater ages are possible.
Donald D. Clayton
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