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R-matrix analysis of reactions in the 9B compound system | | Mark W. Paris
; Gerald M. Hale
; Anna C. Hayes-Sterbenz
; Gerard Jungman
; | | Date: |
10 Apr 2013 | | Abstract: | Recent activity in solving the ’lithium problem’ in big bang nucleosynthesis
has focused on the role that putative resonances may play in resonance-enhanced
destruction of 7Li. Particular attention has been paid to the reactions
involving the 9B compound nuclear system, d+7Be->9B. These reactions are
analyzed via the multichannel, two-body unitary R-matrix method using code
(EDA) developed by Hale and collaborators. We employ much of the known elastic
and reaction data, in a four-channel treatment. The data include elastic
3He+6Li differential cross sections from 0.7 to 2.0 MeV, integrated reaction
cross sections for energies from 0.7 to 5.0 MeV for 6Li(3He,p)8Be* and from 0.4
to 5.0 MeV for the 6Li(3He,d)7Be reaction. Capture data have been added to an
earlier analysis with integrated cross section measurements from 0.7 to 0.825
MeV for 6Li(3He,gamma)9B. The resulting resonance parameters are compared with
tabulated values, and previously unidentified resonances are noted. Our results
show that there are no near d+7Be threshold resonances with widths that are
10’s of keV and reduce the likelihood that a resonance-enhanced mass-7
destruction mechanism, as suggested in recently published work, can explain the
7Li problem. | | Source: | arXiv, 1304.3153 | | Services: | Forum | Review | PDF | Favorites | |
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