论文标题
$^{47} $ ca衰减中三个最强烈的伽玛射线的分支比率
Branching Ratios for the Three Most Intense Gamma Rays in the Decay of $^{47}$Ca
论文作者
论文摘要
通过同位素收获在国家超导型回旋实验室中产生的$^{47} $ CA样本，用于测量4.17（5）％，7.11（5）％和75.0（5）％的分支比例，分别为489.2、807.9和1297.1 KEV特征性胶水效果。基于这些更新的分支比率，基态$^{47} $ ca至$^{47} $ sc beta衰减分支比率已间接测量为17.7（5）％，基态至1297.1 KeV激发状态为82.2（5）％。与当前接受的值相比，这些值代表所有五个分支比率的精度大大提高。此处介绍的测量是在$^{47} $ ca样本中与生长的$^{47} $ SC女儿进行的，而已建立的159.4 Kev Gamma-ray分支比例和$^{47} $ sc的衰减的半衰期。通过验证$^{47} $ CA和$^{47} $ sc在多个光谱上的特征性伽马射线峰值测量的半衰期来支持这些测量值。此外，使用液体闪烁计数对$^{47} $ CA和$^{47} $ SC的半衰期进行了独立测量，以审查本研究中使用的先前报道的值，以找到更新的伽马射线分支比值。
A sample of $^{47}$Ca produced through isotope harvesting at the National Superconducting Cyclotron Laboratory was used to measure branching ratios of 7.17(5)%, 7.11(5)%, and 75.0(5)% for the 489.2, 807.9, and 1297.1 keV characteristic gamma-rays, respectively. Based on these updated branching ratios, the ground state to ground state $^{47}$Ca to $^{47}$Sc beta decay branching ratio has been indirectly measured as 17.7(5)% and the ground state to 1297.1 keV excited state as 82.2(5)%. These values represent a greatly increased precision for all five branching ratios compared to the currently accepted values. The measurements presented here were made relative to the ingrown $^{47}$Sc daughter in a $^{47}$Ca sample and the well-established 159.4 keV gamma-ray branching ratio and the half-life for the decay of $^{47}$Sc. These measurements were supported by verifying that the half-lives measured from characteristic gamma-ray peaks over multiple spectra for both $^{47}$Ca and $^{47}$Sc were consistent with previously reported values. Additionally, the half-lives of both $^{47}$Ca and $^{47}$Sc were independently measured with Liquid Scintillation Counting to reverify the previously reported values used in this study to find updated gamma-ray branching ratio values.
