Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cgrs.conf..291w&link_type=abstract
CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS. Proceedings of the Eleventh International Symposium. Held 2-6 September 2002
Astronomy and Astrophysics
Astrophysics
Scientific paper
Detailed measurements of (p, γ) reactions at energies below Ep = 200 keV are being used to obtain accurate information on astrophysical S-factors. This talk will describe three recent results obtained at TUNL. First, the ratio of the S-factors for the (p, γ0) reaction on 12C and 13C has been measured at Ep = 160 keV. The significance of this ratio will be discussed and a simple model will be used to interpret the result. Second, a report of our recent measurement of the slope of the S-factor in the 6Li(p, γ)7 Be reaction will be presented. The negative slope observed between Ep of 80 - to - 120 keV impacts the extrapolation of the S-factor, but remains unexplained. Finally, a recent study of the 10B(p, γ)11C reaction using polarized protons between 100 and 160 keV revealed sizeable analyzing powers at 90°, indicating the presence of previously unobserved p-wave strength in the ground-state channel. The explanation and implications of this result will be presented.
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