Ca levels at 8-9 MeV by nuclear resonance fluorescence*

We report on the measurement of ¹¹B and ⁴⁰Ca levels between excitation energies of 8 and 9 MeV using nuclear resonance fluorescence (NRF). The experiment was carried out with nearly-monoenergetic and linearly polarized photon beams provided by the High-Intensity γ-ray Source (HIγS) facility at the Triangle Universities Nuclear Laboratory (TUNL). States in 11B are important for calibrations of NRF measurements, while the properties of 40Ca levels impact potassium nucleosynthesis in globular clusters. For 40Ca, we report on improved excitation energies and an unambiguous 2^- assignment for the state at 8425 keV. For 11B, we obtained improved values for γ-ray multipolarity mixing ratios and branching ratios of the 8920 keV level.