Difference between revisions of "LB Feb2017 Se Investigations"
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[[File:Se81 Metastable 103keV overlay.png|200px]] | [[File:Se81 Metastable 103keV overlay.png|200px]] | ||
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| + | An attempt to extract the half life from this energy line is outlined below: | ||
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| + | 1)Within the region of interest, fit the energy line with a Gaussian fit. | ||
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| + | 2)Once the mean, standard deviation, and the constant have been found, feed those into a custom fit function of the form [3]+[0]*TMath::Gaus(x,[1],[2],1) where [0],[1], and [2] are the constant, mean, and the standard deviation of the original Gaussian fit respectively and [3] is a p0 fit to the background. | ||
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| + | 3)Once the background is found, set parameter [3] to zero and integrate the custom Gaussian over the whole window of interest. | ||
Revision as of 18:05, 9 March 2017
Neutron knockout on Se-82
While looking to see if certain lines are indeed selenium within the spectrum, it is worth noting that there are 2 states for Se-81. There is a metastable state with a 57 minute half life and a gamma emission of 103 keV. First I will attempt to show that this metastable state can indeed be seen in the spectrum.
Below is an overlay of 5 plots with different cuts in time.
An attempt to extract the half life from this energy line is outlined below:
1)Within the region of interest, fit the energy line with a Gaussian fit.
2)Once the mean, standard deviation, and the constant have been found, feed those into a custom fit function of the form [3]+[0]*TMath::Gaus(x,[1],[2],1) where [0],[1], and [2] are the constant, mean, and the standard deviation of the original Gaussian fit respectively and [3] is a p0 fit to the background.
3)Once the background is found, set parameter [3] to zero and integrate the custom Gaussian over the whole window of interest.