FCUL experiment: Lifetime of cosmic muons

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FCUL experimentLifetime of cosmic muons

• Colegiul National de Informatica "Tudor Vianu",
  Bucuresti
• Colegiul National Mihai Eminescu, Satu Mare
• Liceul Teoretic "Lucian Blaga, Constanta

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Introduction
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Run 8
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Run 6
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Run 11
Run 14
Run 15
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Another method of datanalysis
The data was processed using Microsoft Excel
A) Visual Analysis 1. Identification of the 3
regions of the plotted graph The first region
(I) ranges between t0,1 µs and t0,6 µs The
second region (II) ranges between ti0,7µs and
ts8,2µs The third region (III) ranges between
t8,3µs and t25,5µs
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Graph of events in region II, approximated by an
exponential curve
Using the equation that approximates the graph in
region II, the mean muon lifetime is
tµ1/0,46412,1547 µs.
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Graph with measured values (Ns), computed with t
obtained by us (Ncalsc-1) and computed with t
given in the bibliography (Ncalc-2)
tµ measured 1/0,48712,0529 µs tµ
computed 1/0,46412,1547 µs tµ
bibliography 1/0,45512,1973 µs
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• Observations 
• A possible cause of the discrepancies between the
  theoretical curve and the experimaental one is
  the relatively small number of events recorded.
• For some muons, after the disintegration (start)
  flash, a flash could appear, due to emission of
  photons in the capture of negative muons by
  atoms, or the capture of electrons by the
  positive muons potential energy well (formation
  of muonium). This flash could be interpreted as a
  false electron (stop) flash, thus altering the
  effective disintegration time.
• In the statistical analysis, the values with
  which the calculations were made, were chosen
  with a dose of bias.