Super-positionof spikes for a slightly super-critical elliptic equation in$RR^N$

We prove existence of radial positive solutions for the equation $ -\Delta u + V(y) u =u^{\frac{N+2}{N-2}+\varepsilon} \quad$ in $\quad \mathbb R^N$ where the potential $V$ is a radial smooth function with $V(0) In particular, we show that the solutions have the shape of a super-position of spikes blowing-up at the origin as $\varepsilon \to 0$, with different rates of concentration.