Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aps..aprq12001a&link_type=abstract
American Physical Society, 2009 APS April Meeting, May 2-5, 2009, abstract #Q12.001
Astronomy and Astrophysics
Astrophysics
Scientific paper
The ^9Be(γ,nα)α cross section is key to understanding isotopic abundances of nuclei produced during the r-process. The inverse reaction bridges the unstable mass gaps at A = 8 leading to α(αn,γ)^9Be(α,n)^12C and so on, producing seed nuclei for the r-process and setting the neutron-to-seed nucleus ratio that drives universal isotopic abundance predictions [Ref 1,2]. In order to make high precision measurements (± 5%) of the ^9Be(γ,nα)α cross-section which includes narrow resonances, a tunable gamma ray beam with small δE/E is required along with gamma and neutron detectors whose efficiencies are well known. We used TUNL's high intensity gamma ray source (HIγS) to measure the cross sections for ^9Be(γ,n) in the energy range of 1.55 to 5.0 MeV with beam energy resolutions between 14 and 150 keV as determined by large Ge detector. The neutrons were detected using ^3He proportional counter. The most recent experimental results as well as their astrophysical consequences will be presented. [Ref 1] B. Meyer et al., Astro J., 399 656-664 (1992). [Ref 2] T. Kajino et al., Nuc. Phys. A, 704, 165c-178c (2002)
Arnold C. W.
Clegg Thomas B.
Howell Rafael C.
Karwowski H. J.
Rusev Gencho
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