Normalized and BKG subtracted data

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For all the timing spectra it was calculated K1(left)-K2(right).

Co-60 was used as a source. 2" thick Pb brick with a hole of a diameter ~5mm was used as a collimator.

Source is 15.85 cm away from the left PMT

15 85 source subtr bkg.png

Source is 26.035 cm away from the left PMT

26 035 source subtr bkg.png

Source is 36.2 cm away from the left PMT

36 2 source subtr bkg.png

Source is 46.35 cm away from the left PMT

46 35 source subtr bkg.png

Source is 56.2 cm away from the left PMT

56 2 source subtr bkg.png

Source is 66.82 cm away from the left PMT

66 82 source subtr bkg.png

Source is 76.83 cm away from the left PMT

76 83 source subtr bkg.png

Source is 87 cm away from the left PMT

87 source subtr bkg.png

Final calibration curve

The whole width of a single error bar represents the value of one sigma in time difference spectrum for BKG subtracted data.

Calibration curve corrected.jpg

Hence, the slope is 0.1450 ns/cm or 6.89 cm/ns.

While using ROOT to fit the data, two ways of linear fit were used: Minuit fit and Singular Value Decomposition fit. The whole width of a single error bar in this case represents the value of the error on the mean in fitted time difference spectrum for BKG subtracted data.

ROOT curve fit.png

The slope is 0.1459 ns/cm or 6.85 cm/ns.

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