  We study the long-time behavior of solutions to the Schr\"odinger equation
with a repulsive Coulomb potential on $\mathbb{R}^3$ for spherically symmetric
initial data. Our approach involves computing the distorted Fourier transform
of the action of the associated Hamiltonian $H=-\Delta+\frac{q}{|x|}$ on radial
data $f$, which allows us to explicitly write the evolution $e^{itH}f$. A
comprehensive analysis of the kernel is then used to establish that, for large
times, $\|e^{i t H}f\|_{L^{\infty}} \leq C t^{-\frac{3}{2}}\|f\|_{L^1}$. Our
analysis of the distorted Fourier transform is expected to have applications to
other long-range repulsive problems.
