Characterizing cosmic muon flux as a function of zenith angle using geiger-müller coincidence setup

Lieu Lin Dan1,2, , Thuy Duyen Pham1,2, Phuong Vy Vo1,2, Tan Loc Huynh1,2, Minh Quan Cao Dinh1,2, Nguyen Duc Manh3, Hong Duyen Trinh Tran1,2, The Thuong Nguyen4
1 Laboratory of Laser Technology, Faculty of Applied Science, Ho Chi Minh City University of Technology (HCMUT), Ho Chi Minh City, 72409, Vietnam
2 Vietnam National University Ho Chi Minh City, Ho Chi Minh City 71308, Vietnam
3 Equipment, Military Hospital 175, Ho Chi Minh City 72518, Vietnam
4 Military Science and Training, Military Hospital 175, Ho Chi Minh City 72518, Vietnam

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The study uses a low-cost, dual Geiger-Müller (GM) tubes coincidence detection device in an outdoor environment to evaluate the relationship between cosmic muon flux on zenith angle. Coincidence occurrences decreased from 484 counts at vertical alignment to 47 counts at horizontal alignment, with zenith angles of 0°, 30°, 45°, 60°, and 90°. Under normal values at sea level, the measured directional muon flux at 0° was 1.301 muons/cm²/min. An exponent of n = 1.063 ± 0.107 was obtained by fitting the angular dependency to a cosine power law via a Bayesian Markov Chain Monte Carlo (MCMC) approach. The result indicates a qualitative agreement with a cosine-based angular distribution under practical constraints, despite the fact that this value is less than the theoretical expectation (n ≈ 2). The setup achieved a Noise Rejection Ratio (NRR) of 0.373% and a Directional Index (DI) of 0.804, indicating moderate directional selectivity and noise suppression. This study demonstrates the viability of Geiger-Müller detectors in basic cosmic ray research and educational contexts.

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Tài liệu tham khảo

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