论文标题
$^{11} $ b和$^{40} $ ca级别的调查在8-9 meV by核共振荧光
Investigation of $^{11}$B and $^{40}$Ca levels at 8-9 MeV by Nuclear Resonance Fluorescence
论文作者
论文摘要
我们使用核共振荧光（NRF）报告了$^{11} $ b和$^{40} $ ca水平的测量值。该实验是由三角核实验室（TUNL）的高强度$γ$ ray源（HI $γ$ s）设施提供的几乎单一的和线性极化的光子光束进行的。 $^{11} $ b中的状态对于NRF测量值的校准很重要，而$^{40} $ CA水平的性能会影响球状簇中的钾核合成钾。对于$^{40} $ ca，我们在8425 KEV上报告了改进的激发能和该州的明确$ 2^ - $分配。对于$^{11} $ b，我们获得了8920 KEV级别的$γ$ -Ray多极性混合比和分支比率的提高值。
We report on the measurement of $^{11}$B and $^{40}$Ca 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 (HI$γ$S) facility at the Triangle Universities Nuclear Laboratory (TUNL). States in $^{11}$B are important for calibrations of NRF measurements, while the properties of $^{40}$Ca levels impact potassium nucleosynthesis in globular clusters. For $^{40}$Ca, we report on improved excitation energies and an unambiguous $2^-$ assignment for the state at 8425 keV. For $^{11}$B, we obtained improved values for $γ$-ray multipolarity mixing ratios and branching ratios of the 8920 keV level.
