Stellar neutron capture rates for Ca-46 and Ca-48

Details Stellar neutron capture rates for Ca-46 and Ca-48 Stellar neutron capture rates for Ca-46 and Ca-48

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291..319k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 1, 1985, p. 319-327.

Physics

13

Calcium Isotopes, Meteoritic Composition, Neutron Cross Sections, Nuclear Fusion, Stellar Physics, Neutron Activation Analysis, Neutron Spectra

Scientific paper

Stellar neutron capture rates for Ca-46 and Ca-48 have been measured by the activation technique. Both kT = 25 keV Maxwellian-like incident neutron spectra and non-Maxwellian higher energy spectra have been utilized to study the possible role of individual capture resonances. Maxwellian-averaged (kT = 30 keV) cross sections of 5.7 + or - 0.5 and 0.95 + or 0.09 mb are derived for Ca-46 and Ca-48, respectively. The possibility of a neutron capture origin for Ca-46 and Ca-48 is discussed in the light of these new cross sections, as well as a mechanism for the production of the observed isotopic anomalies in inclusion EK-1-4-1 from the Allende meteorite.

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