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

ORAL

Abstract

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.

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Publication: D. Gribble, C. Iliadis, R.V.F. Janssens, U. Friman-Gayer, Krishichayan, and S. Finch, Phys. Rev. C (Accepted for publication).<br>Preprint: arXiv:2206.13447

Presenters

  • David Gribble

    University of North Carolina at Chapel Hill

Authors

  • David Gribble

    University of North Carolina at Chapel Hill

  • Christian G Iliadis

    University of North Carolina at Chapel Hill

  • Robert V.F. V Janssens

    University of North Carolina at Chapel Hill, University of North Carolina at Chapel Hill, Triangle Universities Nuclear Laboratory

  • FNU Krishichayan

    Duke University, Duke University, Triangle Universities Nuclear Laboratory

  • Sean W Finch

    Duke University & Triangle Universities Nuclear Laboratory, Duke University, Duke University/TUNL