The Neutrino Electron Correlation Coefficient in Free Neutron Decay ...
The Neutrino Electron Correlation Coefficient in Free Neutron Decay ...
The Neutrino Electron Correlation Coefficient in Free Neutron Decay ...
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Systematic effects II: Edge effect<br />
<strong>Neutron</strong> beam<br />
<strong>in</strong>tensity<br />
normalized to maximum<br />
1.0<br />
0.8<br />
06 0.6<br />
0.4<br />
0.2<br />
0.0<br />
<strong>Neutron</strong> beam profile<br />
at the exit flange of the spectrometer<br />
for two different apertures<br />
Full neutron beam profile<br />
Profile with additional aperture<br />
-40 -20 0 20 40<br />
Projected<br />
area<br />
Width y [mm]<br />
Uncorrected neu utr<strong>in</strong>o electron<br />
correlation coe efficient a exp<br />
<strong>The</strong> <strong>Correlation</strong> coefficient a<br />
-0.08<br />
-0.10<br />
-0.12<br />
a=-0.103(4) from PDG2008<br />
Full beam<br />
Narrow<br />
beam<br />
Each data po<strong>in</strong>t corresponds to about<br />
14 hours of measurement time<br />
… Monte Carlo simulations<br />
are currectly on the way<br />
G. Konrad, University of Ma<strong>in</strong>z <strong>The</strong> aSPECT Experiment, 7th Int’l UCN Workshop Sa<strong>in</strong>t -Petersburg 11 June 2009
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