Difference between revisions of "Runs 4111(D2O)/4112(H2O)"

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  The above plot may look better if you plot <math>Energy</math> -vs- (<math>Energy \pm Energy</math>)  
 
  The above plot may look better if you plot <math>Energy</math> -vs- (<math>Energy \pm Energy</math>)  
 
  As the energy increased the uncertainty increases to the point the the error bar is as big as the magnitude of the energy.
 
  As the energy increased the uncertainty increases to the point the the error bar is as big as the magnitude of the energy.
 +
 +
Simulation of the flight pass length uncertainty <math>U(l_n)</math>:

Revision as of 21:11, 10 September 2012

Subtraction of the stops for each detector in the case of D2O target. The length of the active area (scintillator) of the detector is 75.3 cm.

Run 4111 D2O deltaT.png

Subtraction of the stops for each detector in the case of H2O target:

Run 4111 H2O deltaT.png

Normalized superimposed timing spectra from D2O(black line)/H2O(red line) targets and bin-by-bin subtraction (green line) of D2O-H2O data:

Run 4111 subtr1.png

Run 4111 subtr2.png

Run 4111 subtr3.png

Run 4111 subtr4.png

Neutron energy distribution data analysis for run 4111:

File:D2O neutron spectra.pdf

Errors on the neutron energy for the case of Det M:

[math]E_n \pm U(E_n)=m_nc^2/2 \cdot 1/c^2 \cdot (l_n/t_n)^2 \cdot [1 \pm 2 \sqrt{U^2(l_n)/l^2_n + U^2(t_n)/t^2_n}][/math]

Where uncertainty in the neutron flight pass due to the finite width of the detector (14.8 cm) [math]U(l_n) = 14.8cm/2 \cdot cos(\theta)[/math] and uncertainty in zero time definition in neutron TOF spectrum [math]U(t_n)=10 ns[/math]

Correlation between the neutron energy and neutron energy uncertainty is plotted below:

Error plot detM.png

The above plot may look better if you plot [math]Energy[/math] -vs- ([math]Energy \pm Energy[/math]) 
As the energy increased the uncertainty increases to the point the the error bar is as big as the magnitude of the energy.

Simulation of the flight pass length uncertainty [math]U(l_n)[/math]: