The Sm-151 branching - A probe for the irradiation time scale of the s-process

Details The Sm-151 branching - A probe for the irradiation time scale of the s-process The Sm-151 branching - A probe for the irradiation time scale of the s-process

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331.1047b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 331, Aug. 15, 1988, p. 1047-1057.

Astronomy and Astrophysics

Astrophysics

21

Branching (Physics), Gadolinium Isotopes, Neutron Irradiation, Nuclear Astrophysics, Nuclear Fusion, Samarium Isotopes, Thermal Energy, Absorption Cross Sections, Abundance

Scientific paper

The excitation functions for the reactions Gd-152(n,gamma), Gd-154(n,gamma), Gd-155(n,gamma), and Gd-157(n,gamma) have been measured over the neutron energy range of 3-500 keV. Maxwellian-averaged capture cross sections for thermal energies kT = 5-100 keV have been calculated. At kT = 30 keV, sigma(Gd-152) = 1003 + or - 30 mbarns, sigma(Gd-154) = 878 + or - 27 mbarns, sigma(Gd-155) = 2721 + or - 90 mbarns, and sigma(Gd-157) = 1355 + or - 39 mbarns were found. The data, in conjunction with other cross sections and solar abundances, were used to carry out an s-process analysis of the branchings in the Sm-to-Gd mass range. The s-process is treated in the classical, as well as in the pulsed, model. The solution of the classical model is contained in the pulsed model as the asymtotic solution for large pulse widths. It is shown that this solution is the only one which can reproduce the abundance pattern of the different branchings. Pulse durations are limited to values larger than about 3 yr.

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