7Li(p-->,γ)8Be reaction at Ep=80-0 keV

Details 7Li(p-->,γ)8Be reaction at Ep=80-0 keV 7Li(p-->,γ)8Be reaction at Ep=80-0 keV

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phrvc..56.1605g&link_type=abstract

Physical Review C (Nuclear Physics), Volume 56, Issue 3, September 1997, pp.1605-1612

Physics

Nuclear Physics

12

Radiative Capture, Polarization Phenomena In Reactions, Hydrostatic Stellar Nucleosynthesis, Elementary Particle Processes

Scientific paper

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.

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