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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

Directional Muon flux

By Laura Thorsett and PromitaNandy


  • 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.

The angle of acceptance
The angle of acceptance

  • When stacked directly on top of one another, the angle of acceptance is approx. 168°.

  • This creates a problem:

~ 168°


The solution
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.

Parking garage mishap
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.

Collecting data
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

45 degrees
45 Degrees

  • For 45°, we did take separate data from each of the compass directions.

Side View West

Side View East

 West

East 

90 degrees
90 Degrees

  • We only needed to take the 90° (straight up) once.

Front View

Top View

Side View

Extra altitude experiment
Extra altitude experiment

  • We measured the muon count in 3 different positions at Lick Observatory and here at SCIPP:


  • 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.

The end

THE end!!!!!!!!!!!!!

Thank You!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!