Simulation and Measurement of A Small Cosmic Ray Device

WANG Rong; HAN Chengdong; ZHANG Yapeng; ZHAO Fengyi; LI Yao; FU Qiang; YIN Jun; NI Fafu; WANG Yanyu; ZHANG Pengming; CHEN Xurong

doi:10.11804/NuclPhysRev.33.03.315

A small cosmic ray device is introduced in this paper.It has the demonstration function for popularization of science,and can be used mainly to display the μ counts in a real-time measurement,and to monitor the secondary cosmic ray flux at different angles in a very long time scale (years).We briefly show the hardware of the device and the detecting efficiency calculation by simulation.The detecting efficiency for one detector of the device is 93.1%,and the detecting efficiency is 86.6% for the coincidence measurement of two detectors.Based on the count rate by the detector and the simulated efficiency,the secondary cosmic ray flux perpendicular to the ground surface is measured,which is J=29±3 m^-2sr^-1 s^-1.Moreover,with an application of the device,we measured the angular distribution of the secondary cosmic ray rate in Lanzhou City.The resulting angular distribution agrees well with the empirical formula as I(θ)=IH+I₀ cos^α θ,in which the parameter for the angle-dependence is α=2.42±0.53.

Simulation and Measurement of A Small Cosmic Ray Device

1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;

2. University of Chinese Academy of Sciences, Beijing 100049, China;

3. Lanzhou University, Lanzhou 730000, China

Funds: National Natural Science Foundation of China(11175220); National Basic Research Program of China(973 Program)(2014CB845406); Hundred Talent Program of Chinese Academy of Sciences(Y101020BR0); Light of West China Program of Chinese Academy of Sciences(Y532050XB0)

Received Date: 2015-08-10

Rev Recd Date: 2015-10-19

Publish Date: 2016-09-20

Key words:

cosmic ray /
plastic scintillator detector /
angular distribution of secondary cosmic ray

Abstract: A small cosmic ray device is introduced in this paper.It has the demonstration function for popularization of science,and can be used mainly to display the μ counts in a real-time measurement,and to monitor the secondary cosmic ray flux at different angles in a very long time scale (years).We briefly show the hardware of the device and the detecting efficiency calculation by simulation.The detecting efficiency for one detector of the device is 93.1%,and the detecting efficiency is 86.6% for the coincidence measurement of two detectors.Based on the count rate by the detector and the simulated efficiency,the secondary cosmic ray flux perpendicular to the ground surface is measured,which is J=29±3 m^-2sr^-1 s^-1.Moreover,with an application of the device,we measured the angular distribution of the secondary cosmic ray rate in Lanzhou City.The resulting angular distribution agrees well with the empirical formula as I(θ)=IH+I₀ cos^α θ,in which the parameter for the angle-dependence is α=2.42±0.53.

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Simulation and Measurement of A Small Cosmic Ray Device

doi: 10.11804/NuclPhysRev.33.03.315

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