# 05/11/2011

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Because is something wrong I decided to measure the counts rate as function of threshold energy. Maybe my threshold was incorrect.

Below are my results for n's detector with HAMAMATSU PMT (-1500 V):

So it looks like my previous threshold value (-500 mV) was not good. Let's set it up the -200 mV. And let's see does the n's detector sensitive to the source. The same set up and distances as before.

counts/sec (5 min test), no source counts/sec (5 min test), with source on the top of PS1
n's 19.890.26 (total 5966 cnts) 58.840.29 (total 17652 cnts)

So now we see the source. The ratio are: