Studies on Characteristics of UHE Gamma-ray Air Showers and Its Detection Capability

UHE伽马射线空气簇射特性及探测能力研究

• 批准号: 14540242
• 负责人: INOUE Naoya
• 金额: $ 1.66万
• 依托单位: Saitama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540242/
• 关键词: Ultra-High Energy Cosmic Ray; Cosmic Ray Composition; Cosmic Gamma-ray; Air Shower Simulation

Simulation code has been constructed taking into account of an interaction between primary gamma-ray and geomagnetic field, and energy spectra of secondary particles (gamma-rays and electrons) at the top of atmosphere have been estimated. Air shower development in the atmosphere initiated by such secondary component (dominantly gamma-rays) has been reconstructed by a summation of sub-showers calculated from AIRES air shower code. LPM effect starts its contribution to the shower development from 10^<19.3>eV and makes shower development to be slower and larger fluctuation with increasing a gamma-ray energy. Hence, interaction cross-section between gamma-ray and geomagnetic field becomes larger from 10^<19.2>eV depending on the geomagnetic field strength and primary energy. Shower development affected by geomagnetic field becomes faster due to the bunch of secondary component with lower energies. The contributions of both effect strongly depend on gamma-ray energy and its arrival direction, and remarkable differences on the shower characteristics could be seen as a function of these parameters. Typically average and individual positions of air shower maximum measured by proposed newly experiments will show clear differences of air shower characteristics between proton and gamma-ray initiated ones, and it will be possible to estimate gamma-ray intensity in an energy region above 10^<19>eV.

建立了考虑初级γ射线与地磁场相互作用的模拟程序，估算了大气层顶次级粒子（γ射线和电子）的能谱。由这种次级成分（主要是γ射线）引起的大气中的空气簇射发展已经由AIRES空气簇射程序计算的子簇射的总和重建。LPM效应对簇射发展的贡献从10^ eV开始<19.3>，随着γ射线能量的增加，簇射发展变慢，起伏变大。因此，伽马射线和地磁场之间的相互作用截面从10^ eV开始变大<19.2>，这取决于地磁场强度和初级能量。由于低能量的二次分量束的存在，在地磁场的作用下，簇射的发展速度加快。这两种效应的贡献强烈地依赖于γ射线的能量及其到达方向，并且可以看出，这些参数的函数的簇射特性的显着差异。通过新提出的实验测量的典型的空气簇射最大值的平均和单个位置将显示质子和伽马射线引发的空气簇射特性之间的明显差异，并且将有可能估计10^ eV以上能量区域的伽马射线强度<19>。

项目成果

H.P.Vankov: "LPM Showers in the Atmosphere Taking into Account the Geomagnetic Field"Proc.28^<th> Intern.Cosmic Ray Conf.. HE1. 523-526 (2003)

H.P.Vankov：“考虑到地磁场，大气中的 LPM 阵雨”Proc.28^<th> Intern.Cosmic Ray Conf.. HE1。

A.I.Goncharov: "Features of Inclined Air Showers Induced by EHE Gamma Rays"Proc.28^<th> Intern.Cosmic Ray Conf.HE1. 575-578 (2003)

A.I.Goncharov：“EHE 伽马射线引起的倾斜空气阵雨的特征”Proc.28^<th> Intern.Cosmic Ray Conf.HE1。

Y.Fukushima: "Simulation Studies on Air Fluorescence and Cerenkov Lights from UHE Air Showers for EUSO Experiment."Proc.28^<th> Intern.Cosmic Ray Conf.. HE1. 602-606 (2003)

Y.Fukushima：“EUSO 实验中 UHE 空气喷淋的空气荧光和切伦科夫灯的模拟研究。”Proc.28^<th> Intern.Cosmic Ray Conf.. HE1。

H.P.Vankov: "Ultrahigh Energy Gamma-rays in the Geomagnetic Field and Atmosphere"Physical Review. D67. 043002-1-043002-12 (2003)

H.P.Vankov：“地磁场和大气中的超高能伽马射线”物理评论。

A.I.Goncharov: "Features of Inclined Air Showers Induced by EHE Gamma Rays"Proc.28^<th> Intern.Cosmic Ray Conf.. HE1. 575-578 (2003)

A.I.Goncharov：“EHE 伽马射线引起的倾斜空气阵雨的特征”Proc.28^<th> Intern.Cosmic Ray Conf.. HE1。