An $$\alpha$$-particle (mass 4 amu) and a singly charged sulfur ion (mass 32 amu) are initially at rest. They are accelerated through a potential V and then allowed to pass into a region of uniform magnetic field which is normal to the velocities of the particles. Within this region, the $$\alpha$$-particle and the sulfur ion move in circular orbits of radii $$r_{\alpha}$$ and $$r_{S}$$, respectively. The ratio $$\left(\frac{r_S}{r_{\alpha}} \right)$$ is ___.