7Li(p,γ)8Be reaction at Ep=80–0 keV

M. A. Godwin, C. M. Laymon, R. M. Prior, D. R. Tilley, and H. R. Weller
Phys. Rev. C 56, 1605 – Published 1 September 1997
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Abstract

The 7Li(p,γ)8Be reaction has been studied in the laboratory energy range Ep=80–0 keV. The vector analyzing powers Ay(θ) and the angular distributions of the cross section dσ/dΩ(θ) for capture to the ground, first-, and third-excited states are reported. Additionally, the absolute cross section σT(E) and (equivalently) the astrophysical S factor S(E) have been measured for capture to the third-excited state. Calculations have been performed for all three transitions using the direct capture model to which the known nearby M1 resonances were added. While they predict the angular distribution observed for the cross section and analyzing power in the case of both the first and third-excited states of 8Be, they do not reproduce those for the ground state. These calculations predict negligible M1 strength below 80 keV for capture to the third-excited state (2+, T=0+1, 16.6 MeV), and we therefore conclude that the extrapolation of the astrophysical S factor for the 7Be(p,γ)8B reaction, which has been performed previously by assuming pure E1 capture, is valid with regard to the neglect of any significant p-wave capture strength.

  • Received 25 March 1997

DOI:https://doi.org/10.1103/PhysRevC.56.1605

©1997 American Physical Society

Authors & Affiliations

M. A. Godwin1,2, C. M. Laymon1,2, R. M. Prior3, D. R. Tilley2,4, and H. R. Weller1,2

  • 1Department of Physics, Duke University, Durham, North Carolina 27708
  • 2Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308
  • 3North Georgia College and State University, Dahlonega, Georgia 30597
  • 4North Carolina State University, Raleigh, North Carolina 27695

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Vol. 56, Iss. 3 — September 1997

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