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Krypton source for the Project 8 neutrino mass experiment. Arman Ballado Advisor: Mike Miller. Neutrino mass measurement. Beta Decay . Griffiths. Tritium Beta Decay . Endpoint energy of 18.575 keV. J.A. Formaggio. Project 8 Concept. Use cyclotron frequency to measure energy

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Presentation Transcript
neutrino mass measurement
Neutrino mass measurement
  • Beta Decay

Griffiths

tritium beta decay
Tritium Beta Decay
  • Endpoint energy of 18.575 keV

J.A. Formaggio

project 8 concept
Project 8 Concept
  • Use cyclotron frequency to measure energy
  • Electron will go through cyclotron motion in a magnetic field with a frequency
  • For and
calibration using krypton 83m
Calibration using Krypton-83m
  • Internal Conversion
  • Releases electron with energy (Tritium endpoint energy )
concerns with krypton
Concerns with krypton
  • How does it behave at temperatures near liquid nitrogen or lower?
  • Does it condense on the cold surface?
temperature standoff
Temperature Standoff
  • Viton O-ring minimum temperature: -25°C or 248K
  • for
residual gas analyzer
Residual Gas Analyzer
  • Ionizer -> Quadrupole Mass Filter -> Detector
background data1
Background Data
  • Average = Torr
  • Torr
estimated pressure from radioactive source
Estimated Pressure from Radioactive Source
  • Assuming that the krypton gas behaves like an ideal gas
  • PV = NkT
  • Rubidium activity = 0.15mCi = 5.5 x 106 decays/second
  • N = Activity x time =
  • For an experimental volume of 10L at 77K
conclusion
Conclusion
  • It appears that no significant condensation of krypton occurs, but more tests are needed to be sure.
  • It would be very difficult to detect the radioactive krypton using the RGA
krypton production
Krypton Production
  • To maximize cross-section for production:
  • Rb-83 half-life = 86.2 days
  • Rb-84 lifetime = 33.1 days
  • Rb-83 decays to Kr-83 by electron capture