论文标题
评估气态和液体氩气的平均激发能
Evaluation of the mean excitation energy of gaseous and liquid argon
论文作者
论文摘要
当前和未来的实验需要了解液体氩气的停止功率。它直接用于校准，其中通常将MUON轨道的最小离子化部分用作标准蜡烛。类似地，MUON范围也用作衡量雄性能量的量度。从更广泛的角度来看，停止功率数字进入了所有带电粒子的模拟中，因此不确定性在各种数据分析过程中都广泛传播。控制停止功率的主要参数是平均激发能或I值。氩i值的直接实验信息主要来自气态氩气的测量，其固体氩气的信息非常有限，没有来自液体氩气。振荡器强度分布计算也可以提供一个强大的间接信息来源。我们执行了一个新的计算，并发现仅从振荡器强度信息中，气体氩的I值为$（187 \ pm 5）$ \，EV。结合直接测量和其他计算，我们建议$（187 \ pm 4）$ \，ev，用于气态氩气。对于液体氩气，我们评估了相位差异所产生的中心价值和不确定性的差异，并建议$（197 \ pm 7）$ \，EV。所有不确定性均给予68 \％c.l.
Current and future experiments need to know the stopping power of liquid argon. It is used directly in calibration, where commonly the minimum-ionizing portion of muon tracks is used as a standard candle. Similarly, muon range is used as a measure of muon energy. More broadly, the stopping power figures into the simulation of all charged particles, and so uncertainty propagates widely throughout data analysis of all sorts. The main parameter that controls stopping power is the mean excitation energy, or I-value. Direct experimental information for argon's I-value come primarily from measurements of gaseous argon, with a very limited amount of information from solid argon, and none from liquid argon. A powerful source of indirect information is also available from oscillator strength distribution calculations. We perform a new calculation and find that from oscillator strength information alone, the I-value of gaseous argon is $(187\pm 5)$\,eV. In combination with the direct measurements and other calculations, we recommend $(187\pm 4)$\,eV for gaseous argon. For liquid argon, we evaluate the difference in central value and uncertainty incurred by the difference of phase and recommend $(197\pm 7)$\,eV. All uncertainties are given to 68\% C.L.
