Cf252 runs with HPGe

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I made a page discussing neutron damage to the HPGe detector as a function of the total amount of fast neutrons per cm^2 irradiated on the detector face. 5*10^6 n/cm^2 is a factor of 10 below the point where damage was first observed in an experiment.

12/29/16

No poly was used to shield the HPGe detector.

Run # RunTime [sec] distance[cm] n flux [math][\frac{n}{cm^2}][/math]
[math]=\frac{n_{rate}t}{4\pi d^2}[/math]
(Cf252 rates)
Integral
n flux
[math][\frac{n}{cm^2}] [/math]
configuration notes
5609 4060 30 6850 6850 Cf252 in. Coincidence between HPGe and timing PMT A ToF spectrum exists but is very hectic. Problem may be that the TDC stop is determined by a widened timing PMT pulse in coinc. with a HPGe pulse that has high timing jitter.
none 1250 26 2800 9655 Not taking data during this time.
5611 2509 30 4230 13885 Cf252 in. Coincidence between HPGe and timing PMT. TDC stop was changed to always be 1200 ns after PMT timing pulse, otherwise same setup as 5609. ToF looks good. Neutron rate approx. 3 Hz for detector 90.
5613 10025 15 0 13885 Na-22 source. Coincidence between HPGe and timing PMT Calibration
5614 654 15 0 13885 Co-60 source. Coincidence between HPGe and timing PMT Calibration


Total n flux: 13885 n/cm^2