Muon Lifetime

1
Muon Lifetime

• Eric Chu Joseph St. Marie

2
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.

3
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 1600
• Ended June 28 at 1538

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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 1245
• Ended July 6 at 920

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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)