Low-energy polarized-proton capture onLi6

We have measured the thick-target yield and analyzing power for the ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$(p→,γ) reaction to the ground and first excited state of ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$ below ${\mathit{E}}_{\mathit{p}}$=80 keV. High-purity-germanium detectors were used to acquire data at five angles from θ=0° to 124°. For both states the yield, integrated from the beam energy of 80 keV down to 0 keV, is nearly isotropic and the integrated analyzing power shows only small deviations from zero. This is taken as an indication that, unlike the case of the ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$(p→,${\gamma }_0$ ${)}^8$Be reaction, the p-wave-capture process is unimportant compared to the s-wave process. Transition-matrix-element analyses of the ground-state data yield p-wave contributions of a few percent. Under the assumption of a constant astrophysical S factor, consistent with direct s-wave capture, a value of S=(2.69±0.54)×${10}^{\mathrm{-}5}$ MeV b has been deduced. © 1996 The American Physical Society.