Physics – Nuclear Physics
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aps..dnp.gg006a&link_type=abstract
American Physical Society, 2010 Fall Meeting of the APS Division of Nuclear Physics, November 2-6, 2010, abstract #GG.006
Physics
Nuclear Physics
Scientific paper
New cross section measurements of the astrophysically important ^9Be(γ,n) reaction have been made from 1.5 to 5.18 MeV. The measurements were made using the nearly monoenergetic circularly polarized γ-ray beam at Triangle Universities Nuclear Laboratory's High Intensity γ-ray Source. Measurements over narrow resonances employed beams with energy spread dE/E <= 1%. The energy-dependent absolute efficiency of the neutron counter used in this work was measured to ± 3% accuracy. New resonance parameters for the 4 lowest lying states in ^9Be were determined. A new reaction rate for α+ α+ n has been determined to better than ± 5%. The present rate is ˜ 25% larger than two widely accepted rates [1-2] in the temperature range important for r-process nucleosynthesis. The implications of this new rate on r-process and nuclear abundance predictions will be discussed.[4pt] [1] C. Angulo et al. Nuc. Phys. A 656 (1999) 3-183. [0pt] [2] K. Sumiyoshi et al. Nuc. Phys A 709 (2002) 467-486.
Arnold C. W.
Clegg Thomas B.
Howell Rafael C.
Karwowski H. J.
Rich G. C.
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