October 16, 2008

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

Asymmetry was observed for $D_{2}O$:

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

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

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

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

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

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

$N^{ref,H_{2}O}_{r}$ is the number of neutrons/sec seen by the reference detector with the $H_{2}O$ 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%

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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