The s-process branching at Se-79

Details The s-process branching at Se-79 The s-process branching at Se-79

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167..186w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, no. 1, Oct. 1986, p. 186-199.

Physics

32

Abundance, Branching (Physics), Meteorites, Neutron Cross Sections, Selenium Isotopes, Time Of Flight Spectrometers, Arsenic, Bromine Isotopes, Gallium Isotopes, Germanium Isotopes, Sun

Scientific paper

Neutron capture cross section measurements have been carried out for the isotopes 75As, 79,81Br, 71Ga, and 74Ge by the activation method and for natGa and 80Se by the time-of-flight technique and Maxwellian averaged capture cross sections were derived. The measurements were supplemented by capture cross section calculations with the statistical model especially for the radioactive nuclei 79Se and 81,85Kr. The analysis of the s-process branching at 79Se with a two component model of exponential neutron exposures provided the last missing link for a determination of allowed ranges of s-process neutron densities and temperatures. The solar Kr abundance was determined in the frame of this calculation to N_sun;(Kr) = 50±8(Si = 106) and the solar abundances from A = 69 to 88 were decomposed into the s- and r-process contributions.

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