Muon Lifetime Eric Chu & Joseph St. Marie. Goals of our Experience Gain an understanding of...
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Muon Lifetime
Eric Chu & Joseph St. Marie
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Goals of our Experience• Gain an understanding of electronics
• Design and run a working muon experiment
• Analyze data and improvement experiment
• Run final experiment
• Acquire data reading the lifetime of the muon to be close to 2.19µs.
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Understand the Electronics• How do we use the oscilloscope?
• What is a scintillator?
• How does the setup work?
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An Oscilloscope is…
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A Scintillator is…
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The Setup is…
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Preparation• Conversion Graph
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Conversion Graph
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Setup
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First Experiment• Started: June 25 at 16:00
• Ended: June 28 at 15:38
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Results
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Results Cont.
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Errors
• Thresholds not set
• Scintillator D broken
• Scintillator C not receiving ample voltage
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What they Mean
• Equation used is 1/c
• 1st graph = 1/0.386 = 2.591μs
• 2nd graph = 1/0.397 = 2.519μs
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Final Experiment• Started: July 2 at 12:45
• Ended: July 6 at 9:20
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Preparation• Coincidence graphs
• Singles graphs
• New power supply
• Rearranging the setup
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Coincidence Between Scintillators A & B (B fixed)
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Coincidence Between Scintillators A & B (A fixed)
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Coincidence Between Scintillators B & C (B fixed)
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Singles Graph• To see what kind of particles are coming
through (distinguish between noise and “real” particles)
• Get a better understanding of how threshold affects counts
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Scintillator A Singles
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Scintillator B Singles
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Scintillator C Singles
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Scintillator D Singles*
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Coincidence Graphs• Final Threshold Levels:
– Scintillator A: 120.026 mV– Scintillator B: 200.110 mV– Scintillator C: 70.601 mV
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New Setup
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Results
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Results Cont.
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Results Cont.
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Results Cont.
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What they Mean
• Equation used is 1/c
• 1st graph = 1/0.567 = 1.764μs
• 2nd graph = 1/0.655 = 1.527μs
• 3rd graph = 1/0.462 = 2.165μs
• 4th graph = 1/0.501 = 1.996μs
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Errors• Different setup
• Width
• Faulty equipment
• Different conversion at lower levels?
• Or . . . Fireworks!!
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El Fin
(Spanish for “The End”)