【摘要】 在云南省海拔3220米高山上用G-M计数管描迹仪测量了天顶角78.4-90°范围、平均天顶角86.2°、动量大于2GeV/c的μ介子绝对强度为（9.2±1.0）·10^-5cm^-2·sr^-1·s^-1。配合磁云室测量了动量2.0-51GeV/c的μ子动量谱。更多还原

【Abstract】 At an altitude of 3220 metres above sea level in Yunan, the muon intensity above2.0 GeV/c was measured at large zenith angles （78.4-90°） by a G-M hodoscope. Atmean zenith angle 86.2°, the measured result was （9.2±1.0）·10^-5cm^-2·sr^-1·s^-1. By a magnetic cloud chamber, the muon spectrum at same zenith angles was mea-sured in the momentum region 2-51 GeV/c.更多还原