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0801 Group meeting

0801 Group meeting. Shiuan-Hal. Content. 1. How to measure the muon lifetime? 2. The previous measurements. 3. The MuLan experiment. 4. What is muon capture? 5. The MuCap experiment. How to measure the muon lifetime?. The muon lifetime is :. How is the muon lifetime measured?. N=1.

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0801 Group meeting

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  1. 0801 Group meeting Shiuan-Hal

  2. Content • 1. How to measure the muon lifetime? • 2. The previous measurements. • 3. The MuLan experiment. • 4. What is muon capture? • 5. The MuCap experiment.

  3. How to measure the muon lifetime? The muon lifetime is :

  4. How is the muon lifetime measured? N=1

  5. How is the muon lifetime measured? N=10

  6. How is the muon lifetime measured? N=100

  7. How is the muon lifetime measured? N=100

  8. How is the muon lifetime measured? N=104

  9. How is the muon lifetime measured? N=106

  10. How is the muon lifetime measured? N=1012

  11. How long will it take? Source Muon rate Time to 1012 m+ Cosmic rays 1 / 50 cm2 s 1 / hand s ~104 years e+ Scint. PMT p+ Continuous beam 20 kHz ~1.6 years beam time m+ PMT PMT Water e+ Pulsed beam (usable) ~ 3 weeks beam time

  12. Why use m+ Muon capture

  13. The previous measurements

  14. Experiment by G. Bardin 1 p+ 1. Incidence 140MeV/C beam 2. stopped in the sulphur target and provide an unplarized 3. The decay position was detected by scintillator(Sc) p+ m+

  15. Experiment by K. L. Giovanetti Start: S1 S2 Stop: L R m+ 1. Incidence beam 2. stopped in the water 3. The decay position was detected by PMT L and R m+

  16. The MuLan Experiment BEAM m+ DETECTORS DIGITIZERS DAQ #4

  17. The MuLan result

  18. What is muon capture? μ nucleus Matter e μ

  19. The previous measurements Trigger condition: Stopped muon:1 2 Gamma ray:3 X

  20. The MuCap experiment e m

  21. The MuCap experiment

  22. m- ultra-pure hydrogen The muon will capture by P E p e-

  23. The MuCap result The muon disappearance rate in pure hydrogen is: Because the lifetime is :

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