Variation of Single-Particle Energies: Scaling Behavior for the Spectrum of $^{48}$Cr

We perform shell model calculations for $^{48}$Cr using GXPF1A and FPD6 interactions by varying single particle energies. We find a scaling behavior which leads to the finding that many different sets of interactions with vastly different single particle energies can give almost identical results for the yrast spectrum of $^{48}$Cr