Uncertainties in the ground state structure of 8B and implications for the S17 astrophysical S-factor

Details Uncertainties in the ground state structure of 8B and implications for the S17 astrophysical S-factor Uncertainties in the ground state structure of 8B and implications for the S17 astrophysical S-factor

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nupha.615...69n&link_type=abstract

Nuclear Physics A, v. 615, p. 69-81.

Physics

Nuclear Physics

20

Scientific paper

In calculating the 7Be(p,γ)8B reaction rate, various single particle models have been used to describe the g.s. of 8B. We show that these models produce electric excitation strength distributions that can differ greatly (~= 30%) from the pioneering model, providing the community with a wide range of values for the low energy S-factor, even if no other differences in the reaction theory are introduced. When allowing for deformation of the 7Be core, the maximum of the dB(E1)/dE distribution can be reduced by (~= 15%) and the peak shifts slightly to higher energies. The change in the B(E1) distribution modifies the low energy behaviour of the astrophysical S-factor and brings a reduction of its overall magnitude.

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