The low-lying dipole strength of the $N=28$ closed-shell nucleus ${}^{52}$Cr was studied with nuclear resonance fluorescence up to 9.9 MeV, using bremsstrahlung at the superconducting Darmstadt linear electron accelerator S-DALINAC. Twenty-eight spin-1 states were observed between 5.0 and 9.5 MeV excitation energy, 14 of which for the first time. Both electric dipole excitations ($E1$, around 8 MeV) and magnetic dipole excitations ($M1$, around 9 MeV) were detected. Microscopic calculations within the quasiparticle-phonon nuclear model were performed and show good agreement with experimental results. The structure of $E1$ and $M1$ excitations, respectively, is discussed.

• Received 2 October 2013

DOI:https://doi.org/10.1103/PhysRevC.88.054316