Investigation of B 11 and Ca 40 levels at 8-9 MeV by nuclear resonance fluorescence

We report on the measurement of B11 and Ca40 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 B11 are important for calibrations of NRF measurements, while the properties of Ca40 levels impact potassium nucleosynthesis in globular clusters. For Ca40, we report on improved excitation energies and an unambiguous 2-assignment for the state at 8425 keV. For B11, we obtained improved values for γ-ray multipolarity mixing ratios and branching ratios of the 8920-keV level.

Duke Scholars

Author Sean Finch