05/12/2011 2n correlation test

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The voltages, thresholds and widths are:

	PMT voltage, V	threshold, mV	discr. width, ns
PS1	-1000	-80	20
PS1	-1000	-80	10

Let's do the 2n correlation test with CF252 source. The voltages and thresholds are the same. First the set up is like:

○ PS1 and PS2 are parallel to each other and are faced to the source.

○ the CF252 source in the middle

○ the distance between PS1(PS2) and source is 6 cm

The total number of events (2n fission events + random coincident) are:

	total counts	time	counts/min	counts/sec
PS1	$255977\pm505.9$	10 min	$25597.7\pm50.6$	$426.63\pm0.84$
PS1	$421917\pm649.5$	10 min	$42191.7\pm64.9$	$703.19\pm1.08$
PS1+PS2	$1224\pm34.9$	10 min	$122.4\pm3.5$	$2.04\pm0.06$

Second the set up is like:

○ PS1 and PS2 are perpendicular to each other and are faced to the source.

○ the CF252 source in the middle

○ the distance between PS1(PS2) and source is 6 cm

The total number of events (2n fission events + random coincident) are:

	total counts	time	counts/min	counts/sec
PS1	$250116\pm500.1$	10 min	$25011.6\pm50.0$	$416.86\pm0.83$
PS1	$414774\pm644.0$	10 min	$64.4\pm64.9$	$691.29\pm1.07$
PS1+PS2	$1359\pm36.9$	10 min	$135.9\pm3.7$	$2.26\pm0.06$