Coherent radio pulses from showers in different media: A unified parametrization
Coherent radio pulses from showers in different media: A unified parametrization
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来自不同介质中的簇射的相干无线电脉冲：统一的参数化
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
E. Zas
中科院分区：
文献类型：
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作者：
J. Alvarez;E. Marqu'es;R. V'azquez;E. Zas
我们研究了不同密度介质中电磁簇射电子过剩所产生的切伦科夫射电脉冲的频率和角度依赖关系，这些介质被认为是探测冰、盐和月球层等超高能中微子的目标。利用一个简单的簇射发展模型，我们重新推导了电场谱随介质密度、辐射长度、莫里面半径、临界能量和折射率等性质的标度。我们将标度关系的预测结果与我们自己开发的基于GEANT4的蒙特卡罗模拟的数值结果进行了比较，并定量地讨论了标度关系的预测能力。根据实际应用中所用介质的有关性质，我们还给出了冰、盐和月球表层中电场的频谱和角分布的统一参数化。我们建立了我们的参数化法的适用性。我们的公式对于估计目前和未来使用无线电技术的中微子探测器的接受度以及许多其他实际应用是有用的。
We study the frequency and angular dependences of Cherenkov radio pulses originated by the excess of electrons in electromagnetic showers in different dense media that are being given consideration as targets for ultra high energy neutrino detection such as ice, salt and the lunar regolith. By means of a simple model of shower development we rederive the scaling of the electric field spectrum with the properties of the media such as density, radiation length, Moli\`ere radius, critical energy and refraction index. We compare the predictions of the scaling relations to the numerical results obtained in our own developed GEANT4-based Monte Carlo simulation, and address in a quantitative manner the predictive power of the scaling relations. We also give a unified parametrization of the frequency spectrum and angular distribution of the electric field in ice, salt, and the lunar regolith, in terms of the relevant properties of the media to be used in practical applications. We establish the applicability of our parametrizations. Our formulas are useful for estimates of the acceptance of current and future neutrino detectors using the radio technique, and for many other practical applications.