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Measuring Cosmic Ray Muon Lifespan: Techniques and Results

This study explores a simple technique for determining the mean life of cosmic ray muons through practical experiments. We investigate muon physics, measuring the flux of sea-level cosmic rays. The absorption of a stopped muon by scintillator nuclei is analyzed, demonstrating a proportional relationship to Z^4. Multiple experiment setups are described, including thresholds, coincidences, and count measurements across different scintillator areas. Results reveal flux rates and help generate fitting relations to visualize outcomes. Further analysis to refine results is underway.

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Measuring Cosmic Ray Muon Lifespan: Techniques and Results

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  1. WORK 08 01 江柔婷

  2. What did I do? • Simple technique for determining the mean life of the cosmic ray mu meson • Muon physics • Measurement of the flux of sea-level cosmic ray • others

  3. μ- +p n+ ν μ muon • Two ways for a muon to disappear • Absorption of a stopped muon by scintillator nuclei is proportional to Z4 • Measure with instrument v.s. the free space

  4. Just do it more!

  5. Try it! • Flux( muon) ~ Flux( cosmic ray) = 1 per min. per cm2 • Scintillator area = 750 cm2 , # count per 60sec.,total count 750

  6. Try it! • Plateau: S1, S2 • Threshold(s2, s3), befor coincidence, # count : s3 (OK) ; s2 (OVER) • S1 : 1000 v ,-100 mv S2 : 1000 v ,-100 mv S3 : 800 v ,-100 mv

  7. High Voltage Discriminater S1 PMT1 Coincidence Counter S2 PMT2 S3 PMT3 Oscilloscope Try it!

  8. + + + - - - Try it! • Result (# count per 60 sec.): S1, S3 560.5 23.363 S2, S3 577.7 17.171 S1, S2, S3 464.2 38.373

  9. x Function generator oscilloscope Fan out Delay check

  10. Delay check • Cable (color) • Model delay : 10ns

  11. Perl • 目標 : 實驗結果中挑選符合條件的值，再分類做圖，fitting得到關係式。 • To be continued!

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