, Volume 31, Issue 4, pp 357-367,
Open Access This content is freely available online to anyone, anywhere at any time.
Date: 21 Oct 2011

The 11 B(p ,α)8 Be → α + α and the 11 B(α,α)11 B Reactions at Energies Below 5.4 MeV


Measurements of the absolute cross section and angular distributions for the \(^{11} \hbox{B}(p,\alpha)^{8}{\text{Be}}\rightarrow\alpha+\alpha\) and the 11B(α,α)11B reactions have been performed from 0.15 to 3.8 MeV for the 11B(p,α) study and from 2 to 5.4 MeV for the 11B(α,α) reaction. The absolute cross sections are presented in terms of the total number of α-particles detected in order to avoid uncertainties due to ambiguities in the number of alpha particles emitted in the reaction at a particular energy. The angular distributions of the 11B(p,α)8Be(2+) reaction were fit to a Legendre polynomial expansion and the coefficients are presented. Finally, the 11B(α,α)11B data were fit in terms of phase shifts (ignoring the spin of the target), providing a convenient representation of the elastic cross section data between 2 and 5.4 MeV.