Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...174..323b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 174, no. 1-2, March 1987, p. 323-328.
Astronomy and Astrophysics
Astrophysics
20
Argon Isotopes, Calcium Isotopes, Neutron Cross Sections, Nuclear Capture, Nuclear Fusion, Sulfur Isotopes, Beta Particles, Potassium Isotopes
Scientific paper
The neutron capture cross section of 40Ar has been measured using the activation technique. A Maxwellian averaged capture cross section of 2.55±0.15 mb at a thermal energy of kT = 26 keV has been obtained. With the present result and additional new data from literature an s-process analysis in the mass region from A = 34 to 42 has been carried out. A two component s-process with exponential neutron exposures has been used assuming continuous and pulsed neutron irradiations. The calculation yielded the s-process abundances of the isotopes in this mass region. The 40Ar and 40K abundances are sensitive to a branching at 39Ar. For 40Ar values can range between 5 and 30 [Si ≡ 106]. The analysis with the classical unpulsed s-process yielded N(40Ar) = 24±7 [Si ≡ 106].
Beer Hermann
Penzhorn R.-D.
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