$^{99}$Tc β谱的高精度测量
High precision measurement of the $^{99}$Tc $β$ spectrum
AI总结：
本研究通过多实验室多探测器的高精度测量与含核结构、原子效应的理论计算，获取了$^{99}$Tc的β谱，提取并推导了$Q_β$、轴矢量耦合常数有效值等关键核物理参数。
摘要：
我们在两个实验室利用金属磁量热计开展了$^{99}$Tc β谱的高精度测量。独立的样品制备、评估方法与分析得到了一致的结果，且可测量低至1 keV以下的能谱。通过对实验数据集的交叉评估，也得到了一致的β谱。另有一项采用4π构型硅探测器的独立测量，证实了25 keV以上的能谱形状。我们开展了包含核结构与原子效应的详细理论计算，发现能谱形状对轴矢量耦合常数的有效值敏感。结合测量与预测，我们提取出$Q_β=$295.82(16) keV、$g_A^{\text{eff}} = 1.530 (83)$。此外，我们还推导出β谱平均能量$\bar{E}_β$=98.45(20) keV、$\text{log} f = -0.47660 (22)$以及$\text{log} ft = 12.3478 (23)$。
英文摘要：
Highly precise measurements of the $^{99}$Tc beta spectrum were performed in two laboratories using metallic magnetic calorimeters. Independent sample preparations, evaluation methods and analyses yield consistent results and the spectrum could be measured down to less than 1 keV. Consistent beta spectra were also obtained via cross-evaluations of the experimental data sets. An additional independent measurement with silicon detectors in a $4π$ configuration confirms the spectrum shape above 25 keV. Detailed theoretical calculations were performed including nuclear structure and atomic effects. The spectrum shape was found to be sensitive to the effective value of the axial-vector coupling constant. Combining measurements and predictions, we extracted $Q_β=$295.82(16) keV and $g_A^{\text{eff}} = 1.530 (83)$. Furthermore, we derived the mean energy of the beta spectrum $\overline{E}_β$=98.45(20) keV, $\log f = -0.47660 (22)$ and $\log ft = 12.3478 (23)$.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
