Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aipc..125..774c&link_type=abstract
AIP Conference Proceedings, Volume 125, pp. 774-777 (1985).
Astronomy and Astrophysics
Astrophysics
Radiative Capture, 39<=A<=58
Scientific paper
Attempts to understand abundance anomalies of the Ca isotopes in the Allende meteorite via the nβ-process require 30-keV Maxwellian averaged capture cross sections. Experimental data on 48Ca in this energy region of astrophysical significance is important since a single resonance in this vicinity could dominate the caputre cross section. Neutron capture and total cross section measurements have been performed at ORELA on a 9.97-g sample of CaCO3, enriched to 96% 48Ca, over the energy ranges 10 eV-500 keV (σγ) and 10 keV-4 MeV (σT). Only two small resonances were found for 48Ca in the 30-keV energy region (at 19.3 and 106.9 keV) and those only in capture. Their contribution to the 30-keV-averaged cross section is only 50 μb compared to 1.0 mb calculated from direct capture. The p-wave strength and large d5/2 strength observed above 150 keV do no contribute significantly to the 30 keV capture.
Carlton R. F.
Harvey Jeffrey A.
Hill N. W.
Macklin Richard L.
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