Difference between revisions of "October 16, 2008"

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NaI detector in place and working (used to measure the gamma flash).
 
NaI detector in place and working (used to measure the gamma flash).
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[[Image:Gamma flash measurement from NaI det.JPG]]
 
  
 
Asymmetry was observed for <math>D_{2}O</math>:
 
Asymmetry was observed for <math>D_{2}O</math>:
  
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<math>Asymmetry = \frac{\left (\frac{A^{n,D_{2}O}_{up}}{N^{ref,D_{2}O}_{r}} - \frac{A^{n,H_{2}O}_{up}}{N^{ref,H_{2}O}_{r}} \right ) - \left (\frac{A^{n,D_{2}O}_{side}}{N^{ref,D_{2}O}_{r}} - \frac{A^{n,H_{2}O}_{side}}{N^{ref,H_{2}O}_{r}} \right )}{\left (\frac{A^{n,D_{2}O}_{up}}{N^{ref,D_{2}O}_{r}} - \frac{A^{n,H_{2}O}_{up}}{N^{ref,H_{2}O}_{r}} \right ) + \left (\frac{A^{n,D_{2}O}_{side}}{N^{ref,D_{2}O}_{r}} - \frac{A^{n,H_{2}O}_{side}}{N^{ref,H_{2}O}_{r}} \right )}
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<math>Asymmetry (%) = \frac{\left (\frac{A^{n,D_{2}O}_{up}}{N^{ref,D_{2}O}_{r}} - \frac{A^{n,H_{2}O}_{up}}{N^{ref,H_{2}O}_{r}} \right ) - \left (\frac{A^{n,D_{2}O}_{side}}{N^{ref,D_{2}O}_{r}} - \frac{A^{n,H_{2}O}_{side}}{N^{ref,H_{2}O}_{r}} \right )}{\left (\frac{A^{n,D_{2}O}_{up}}{N^{ref,D_{2}O}_{r}} - \frac{A^{n,H_{2}O}_{up}}{N^{ref,H_{2}O}_{r}} \right ) + \left (\frac{A^{n,D_{2}O}_{side}}{N^{ref,D_{2}O}_{r}} - \frac{A^{n,H_{2}O}_{side}}{N^{ref,H_{2}O}_{r}} \right )} * 100
 
</math>
 
</math>
  
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[http://www.iac.isu.edu/mediawiki/index.php/October_Fission_HRRL_Measurements_2008 Go Back]
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<math>A^{n,D_{2}O}_{up}</math> is the number of neutrons/sec seen by the detector when placed above the <math> D_{2}O </math> target.
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<math>A^{n,D_{2}O}_{side}</math> is the number of neutrons/sec seen by the detector when placed to the side of the  <math> D_{2}O </math> target.
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<math>A^{n,H_{2}O}_{up}</math> is the number of neutrons/sec seen by the detector when placed above the <math> H_{2}O </math> target.
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<math>A^{n,H_{2}O}_{side}</math> is the number of neutrons/sec seen by the detector when placed to the side of the  <math> H_{2}O </math> target.
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<math>N^{ref,D_{2}O}_{r}</math> is the number of neutrons/sec seen by the reference detector with the <math> D_{2}O </math> target. (The reference detector is beside the place of the side detector.)
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<math>N^{ref,H_{2}O}_{r}</math> is the number of neutrons/sec seen by the reference detector with the <math> H_{2}O </math> target. (The reference detector is beside the place of the side detector.)
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Detector A Asymmetry: First run = -20.27%; Second run = -19.84%
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Detector C Asymmetry: First run = -12.69%; Second run = -9.16%
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[[Image:Four_detectors_asymmetry.jpg | 500 px]]
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On the picture: 1D - timing spectrum taken by upper detector, 1C - timing spectrum taken by side detector, 1A - timing spectrum taken by side reference (being kept stationary) detector, 1B - NaI accelerator current monitor
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[http://wiki.iac.isu.edu/index.php/October_Fission_HRRL_Measurements_2008 Go Back]

Latest revision as of 06:31, 5 February 2009

NaI detector in place and working (used to measure the gamma flash).

Asymmetry was observed for [math]D_{2}O[/math]:

[math]Asymmetry (%) = \frac{\left (\frac{A^{n,D_{2}O}_{up}}{N^{ref,D_{2}O}_{r}} - \frac{A^{n,H_{2}O}_{up}}{N^{ref,H_{2}O}_{r}} \right ) - \left (\frac{A^{n,D_{2}O}_{side}}{N^{ref,D_{2}O}_{r}} - \frac{A^{n,H_{2}O}_{side}}{N^{ref,H_{2}O}_{r}} \right )}{\left (\frac{A^{n,D_{2}O}_{up}}{N^{ref,D_{2}O}_{r}} - \frac{A^{n,H_{2}O}_{up}}{N^{ref,H_{2}O}_{r}} \right ) + \left (\frac{A^{n,D_{2}O}_{side}}{N^{ref,D_{2}O}_{r}} - \frac{A^{n,H_{2}O}_{side}}{N^{ref,H_{2}O}_{r}} \right )} * 100 [/math]

[math]A^{n,D_{2}O}_{up}[/math] is the number of neutrons/sec seen by the detector when placed above the [math] D_{2}O [/math] target.

[math]A^{n,D_{2}O}_{side}[/math] is the number of neutrons/sec seen by the detector when placed to the side of the [math] D_{2}O [/math] target.

[math]A^{n,H_{2}O}_{up}[/math] is the number of neutrons/sec seen by the detector when placed above the [math] H_{2}O [/math] target.

[math]A^{n,H_{2}O}_{side}[/math] is the number of neutrons/sec seen by the detector when placed to the side of the [math] H_{2}O [/math] target.

[math]N^{ref,D_{2}O}_{r}[/math] is the number of neutrons/sec seen by the reference detector with the [math] D_{2}O [/math] target. (The reference detector is beside the place of the side detector.)

[math]N^{ref,H_{2}O}_{r}[/math] is the number of neutrons/sec seen by the reference detector with the [math] H_{2}O [/math] target. (The reference detector is beside the place of the side detector.)

Detector A Asymmetry: First run = -20.27%; Second run = -19.84%

Detector C Asymmetry: First run = -12.69%; Second run = -9.16%

Four detectors asymmetry.jpg

On the picture: 1D - timing spectrum taken by upper detector, 1C - timing spectrum taken by side detector, 1A - timing spectrum taken by side reference (being kept stationary) detector, 1B - NaI accelerator current monitor

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