05/12/2011 random coincidence cosmic test - Revision history

Shaproma at 19:00, 24 May 2012

2012-05-24T19:00:53Z

2011-06-03T16:44:58Z

2011-05-14T05:19:11Z

2011-05-14T05:09:53Z

2011-05-14T05:06:53Z

2011-05-14T05:02:56Z

2011-05-14T04:51:30Z

2011-05-14T04:50:20Z

2011-05-14T04:47:26Z

2011-05-14T04:08:39Z

← Older revision		Revision as of 19:00, 24 May 2012
Line 1:		Line 1:
−	[https://wiki.iac.isu.edu/index.php/~~N%27s_detector_calibration~~ go back]	+	[https://wiki.iac.isu.edu/index.php/Roman_measurements go back]
−

← Older revision	Revision as of 16:44, 3 June 2011
Line 1:	Line 1:
	+	[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration go back]

← Older revision		Revision as of 05:19, 14 May 2011
Line 1:		Line 1:
−	~~[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]~~	+

← Older revision		Revision as of 05:09, 14 May 2011
Line 1:		Line 1:
−	[https://wiki.iac.isu.edu/index.php/N%~~27s_det_calibration~~ Go Back]	+	[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]
		+

	The voltages, thresholds and widths are:		The voltages, thresholds and widths are:

← Older revision		Revision as of 05:06, 14 May 2011
Line 1:		Line 1:
−	[https://wiki.iac.isu.edu/index.php/N%~~27s_detector_calibration~~ Go Back]	+	[https://wiki.iac.isu.edu/index.php/N%27s_det_calibration Go Back]

	The voltages, thresholds and widths are:		The voltages, thresholds and widths are:

@@ Line 1: / Line 1: @@
 [https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]
-The voltages and thresholds  are:
+The voltages, thresholds and widths are:
 {| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 ! scope="col" width="50" |

@@ Line 29: / Line 29: @@
 |<math>10247\pm101.2</math>||70 min||<math>2.44\pm0.02</math>
 |-
-!PS1 (next day test)
+!PS1 (May 13)
 |<math>12178\pm110.3</math>||80 min||<math>2.54\pm0.02</math>
 |-
@@ Line 35: / Line 35: @@
 |<math>12969\pm113.9</math>||70 min||<math>3.09\pm0.03</math>
 |-
-!PS2 (next day test)
+!PS2 (May 13)
 |<math>14674\pm121.1</math>||80 min||<math>3.06\pm0.03</math>
 |-
@@ Line 41: / Line 41: @@
 |<math>3\pm1.7</math>||70 min||<math>(0.7\pm0.4)\cdot 10^{-3}</math>
 |-
-!PS1+PS2  (next day test)
+!PS1+PS2  (May 13)
 |<math>11\pm3.3</math>||80 min||<math>(2.3\pm0.7)\cdot 10^{-3}</math>
 |}

← Older revision		Revision as of 04:47, 14 May 2011
Line 1:		Line 1:
	[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]		[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]

		+	The voltages and thresholds are:
		+	{\| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
		+	! scope="col" width="50" \|
		+	! scope="col" width="50" \| PMT voltage, V
		+	! scope="col" width="50" \| threshold, mV
		+	! scope="col" width="50" \| discr. width, ns
		+	\|-
		+	!PS1
		+	\| -1000\|\| -80\|\| 20
		+	\|-
		+	!PS1
		+	\| -1000\|\| -80\|\| 10
		+	\|}

	The powers are:		The powers are:

@@ Line 85: / Line 85: @@
 So what we are measured?
-:○ purely random events from different reaction?. But why does the coincidence rate depend from distance between PS1 and PS2? Statistical fluctuation? Electronics false?
+:○ purely random events from different reaction?. But why does the coincidence rate depend from distance between PS1 and PS2? Statistical fluctuation? Electronic false events?
 :○ or probably some coincidence events caused by air shower originated from one particle nearby the two detectors.  Now if detectors located closer to each other the rate should be higher because the detectors are closer to initial particle. As evidence note that rates for PS1 and PS1 for different distances are almost the same. But the coincidence rate PS1+PS2 increased almost in 3 times as distance reduced from 30 cm to 5 cm. (That need to be studied)
 Also Sadiq did something  at that time with gamma source. Maybe that effected somehow my measurements.