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	[math]\displaystyle{ 255977\pm505.9 }[/math]	10 min	[math]\displaystyle{ 25597.7\pm50.6 }[/math]	[math]\displaystyle{ 426.63\pm0.84 }[/math]
PS1	[math]\displaystyle{ 421917\pm649.5 }[/math]	10 min	[math]\displaystyle{ 42191.7\pm64.9 }[/math]	[math]\displaystyle{ 703.19\pm1.08 }[/math]
PS1+PS2	[math]\displaystyle{ 1224\pm34.9 }[/math]	10 min	[math]\displaystyle{ 122.4\pm3.5 }[/math]	[math]\displaystyle{ 2.04\pm0.06 }[/math]

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	[math]\displaystyle{ 250116\pm500.1 }[/math]	10 min	[math]\displaystyle{ 25011.6\pm50.0 }[/math]	[math]\displaystyle{ 416.86\pm0.83 }[/math]
PS1	[math]\displaystyle{ 414774\pm644.0 }[/math]	10 min	[math]\displaystyle{ 64.4\pm64.9 }[/math]	[math]\displaystyle{ 691.29\pm1.07 }[/math]
PS1+PS2	[math]\displaystyle{ 1359\pm36.9 }[/math]	10 min	[math]\displaystyle{ 135.9\pm3.7 }[/math]	[math]\displaystyle{ 2.26\pm0.06 }[/math]