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WORK

WORK. 08 01 江柔婷. 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. μ - +p n+. ν. μ. muon.

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WORK

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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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