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Directional Muon flux

Directional Muon flux. By Laura Thorsett and Promita Nandy. Introduction. Testing muon flux at 8 compass directions and 3 azimuth angles. Research Questio n : At which angle and direction do muons reach our detectors in the highest concentration ?

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Directional Muon flux

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  1. Directional Muon flux By Laura Thorsett and PromitaNandy

  2. Introduction • Testing muon flux at 8 compass directions and 3 azimuth angles. • Research Question: At which angle and direction do muonsreach our detectors in the highest concentration? • Hypothesis: Most at 90°, least at 0°. • We believed that there would be no difference in fluxat differentcompass directions.

  3. The angle of acceptance • When stacked directly on top of one another, the angle of acceptance is approx. 168°. • This creates a problem: ~ 168° Overlap

  4. The solution • The farther apart the detectors are, the smaller the angle of acceptance. • We decided that we wanted an angle of acceptance of about 45 degrees: • To achieve this, we calculated that the (atthe time) 4 detectors should be approx. 9 inches apart.

  5. Box (Only 2 Detectors)

  6. Parking garage mishap • We wanted to take the detectors out of the building to escape the concrete walls, which are thicker in places. • We took it to the top of the parking garage. • Light leaks. Yay. • We took them back to the building and retested them, they didn’t work as well as expected. • We borrowed 2 detectors from Stu, and re-calibrated them.

  7. Collecting Data • First, we aligned the box with the horizon (0°): Side View • We took data with the box facing N-S, NE-SW, E-W, SE-NW. • We did not need to do individual data runs for North and South or the other pairs, because at 0°, they are the same thing. Top View

  8. 45 Degrees • For 45°, we did take separate data from each of the compass directions. Side View West Side View East  West East 

  9. 90 Degrees • We only needed to take the 90° (straight up) once. Front View Top View Side View

  10. Results

  11. Comparisons

  12. from each Azimuth angle

  13. 45 Degrees by direction

  14. 0 Compared to 45

  15. Extra altitude experiment • We measured the muon count in 3 different positions at Lick Observatory and here at SCIPP:

  16. Conclusions • There was no consistent difference in the muon count in relation to compass direction. • When the box was straight up, there was a huge increase (more than doubling) in the count from the 45 degree count.

  17. THE end!!!!!!!!!!!!! Thank You!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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