2n Detector efficiency test

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Cf-252 TOF calibration

File:CF 252 TOF calibr.pdf

CFD threshold adjustment w/ Cf-252 source

File:CFD1.pdf

Old detector design

This is a technique for efficiency test of the neutron detector used in the 2n correlation experiment. The neutron source was Cf-252 and fission trigger was made out of the NaI(Tl) detector with calibrated ADC and known spectrum of Cf-252 neutrons and photons. Old design of the neutron detector (w/o PMT holders).

File:Technique1.pdf

One more stage of the efficiency procedure measurements with improved BKG studying. Old design of the neutron detector (w/o PMT holders).

File:Technique1 1.pdf

Some scope pictures showing DAQ timing setup.

Scope pic 1.png

Scope pic 2.png

New detector design

Final procedure with the CFD threshold adjusted. Dr. Dale's design of the PMT holders.

File:Technique2 2.pdf

Here is some CFD S/N calibration curve for Det_E.

File:CFD calibration DetE.pdf

Detector efficiency measurement vis D2 photodisintegration

File:Technique diff xsect.pdf