Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..apr..m703w&link_type=abstract
American Physical Society, APS/AAPT Joint April Meeting, April 18-21, 1998 Columbus, Ohio, abstract #M7.03
Astronomy and Astrophysics
Astrophysics
Scientific paper
Analyzing powers for the ^9Be( p,γ)^10B reaction were measured by stopping a 100 keV polarized proton beam in a ^9Be target. The measured vector analyzing power is A_y(90^circ) = 0.18 ± 0.03 for capture to the ground state, with smaller values at 90^circ for the first three excited states. The astrophysical S-factors were obtained for each of the final states using a direct capture-plus-resonance model calculation which fitted both the present analyzing power data and the previously reported cross-section data( D. Zahnow et al.), Nucl. Phys. A589, 95 (1995).. The S-factors at Ep = 0 keV for capture to the ground state and first three excited states were 0.25, 0.34, 0.27, and 0.10 keV\cdotb, respectively, which are considerably smaller than previously reported(F. E. Cecil et al.), Nucl. Phys. A539, 75 (1992).. The tails of resonances in ^10B were observed to raise the extrapolated values of the astrophysical S-factors at Ep = 0 keV by 31% over a pure E1 direct capture model prediction for capture to the ground state and by a factor of 2.4, 9 and 5 for capture to the first three excited states respectively.
Godwin M. A.
Guillemette J. F.
Laymon C. M.
Prior R. M.
Rice John B.
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