those partial waves. The impact of the resonances for near-resonant values of $s$ is presented on Figure \[KrevsE\]. We note that the resonances are more important for low values of $y$, where the particles need more time behind the centrifugal barrier for chemical reaction, so forming a quasibound state greatly enhances the reaction rate. At high energies many partial waves contribute to the reaction rate and we observe quite a dense structure of peaks. However, after averaging the reaction rate with respect to thermal distribution $\langle K^{re}\rangle_{th}(T)=2/\sqrt{\pi}(k_B T)^{(3/2)} \int{dE\,\sqrt{E}e^{-E/k_B T}K^{re}(E)}$ the resonances are washed out but on average add an extra contribution to the reaction rate, making it larger than classical approximation , as can be seen on Figure \[KrevsT\]. At energies above $\sim 100E_6$ the parabolic approximation starts to agree well with the numerical results, giving a good estimate of this contribution.

The elastic rate is particularly important for experiments which aim to use the evaporative cooling technique [@Stuhl2012]. Reaching thermal equilibrium is possible only if the elastic collisions are more frequent than chemical reactions. Formulas  and predict that at high energies the elastic rate behaves like $E^{3/10}$, while the reactive one like $E^{1/6}$, so elastic collisions should dominate 