Difference between revisions of "Integrated asymmetry"
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<math>\delta (Asymm) = | <math>\delta (Asymm) = | ||
\sqrt{\sum_{k=up}^{side}\ \sum_{m=D_2O}^{H_2O} | \sqrt{\sum_{k=up}^{side}\ \sum_{m=D_2O}^{H_2O} | ||
− | \left[\left(\frac{\partial A}{\partial N_{k}^{l}}\delta N_{ | + | \left[\left(\frac{\partial A}{\partial N_{k}^{l}}\delta N_{k}^{l}\right)^2 + |
− | \left(\frac{\partial A}{\partial W_{k}^{l}}\delta W_{ | + | \left(\frac{\partial A}{\partial W_{k}^{l}}\delta W_{k}^{l}\right)^2\right]}</math> |
If assume:<br> | If assume:<br> | ||
− | <math>\delta N_{ | + | <math>\delta N_{k}^{l} = \sqrt{N_{k}^{l}}</math><br> |
− | <math>\delta W_{ | + | <math>\delta W_{k}^{l} = \sqrt{N_{k}^{l}};\quad...</math><br><br> |
<pre> | <pre> |
Revision as of 04:18, 9 June 2009
Integrated asymmetry calculation
where
total number of neutrons detected, k = [Up,Side], m = [D2O, H2O]
weighted (NaI, Ref) coefficient, k = [Up,Side], m = [D2O, H2O]
- For detector A summation is over [1000:1600] bin numbers
- For detector C summation is over [900:1600] bin numbers
Error calculation
If assume:
what is <math>\sqrt{up}</math> ? Does <math>\sqrt{up}</math> = number of counts in in the detector up spectrum as suggested above? Why not use <math>N_{up}</math> as variable. If distribution is Binomial (detector yes/no) then width of distribution is <math>1.265\sqrt{N}</math> = 2 times e error. Relative error = <math>\frac{error}{Ave} = \frac{0.6325 \sqrt{N}}{N/2}</math> If you are measuring total number of neutrons detected then you will have binomial if you break up the time spectrum into bins and don't integrate then probability distribution is combination of detection probability and time measurement probability.
Then
where
Cases was analysed
Det A (was analized all possible combination):
D2O Up, files# [40,56,102,108,134,205,210,230];
H2O Up, files# [44];
D2O Side, files# [48,74,78,82,86,90,94,146,180,190,225,235];
H2O Side, files# [52];
Det C (was analized all possible combination):
D2O Up, files# [49,75,79,83,87,91,95,147,181,191,226,236];
H2O Up, files# [53];
D2O Side, files# [41,57,103,107,135,206,211,231];
H2O Side, files# [45];
Weighted coefficients was used
Results
Table 1: Det A, weighted with
Table 2: Det C, weighted with
Table 3: Det A, weighted with
Table 4: Det C, weighted with
Change the X-axis to nanosecond or neutron energy (TF). A:Will do it.