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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Further on-go<strong>in</strong>g improvements<br />
• Study of surface potential; Kelv<strong>in</strong> probe<br />
In collaboration with<br />
Prof. I. Baikie,<br />
KP Technologies<br />
Height [mm]<br />
40<br />
35<br />
30<br />
25<br />
20<br />
15<br />
10<br />
5<br />
0<br />
0 100 200 300<br />
KP Technologies Azimuth angle [°]<br />
4900<br />
4950<br />
5000<br />
5050<br />
5100<br />
Work Function [meV]<br />
Possible solution<br />
Other surface<br />
coat<strong>in</strong>gs<br />
‣ evaporated gold?<br />
‣ chromium?<br />
‣ colloidal carbon?<br />
• On-l<strong>in</strong>e monitor<strong>in</strong>g of the magnetic field ratio; NMR with polarized 3 He<br />
Amplitude V<br />
4<br />
2<br />
0<br />
-2<br />
-4<br />
0 5 10 15 20 25<br />
Time ms<br />
ν = γ He-3 B 0<br />
γ He-3 ≈ 32.436 [MHz/ T]<br />
• Calibration source; electron impact ionization<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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