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April-June 2007

April-June 2007. Oscillations: Kinematics in weak decays: 0 n double beta decay:. ?. solar. Kamland Kamland + solar. Favored channel:. Global fit to all existing data.

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April-June 2007

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  1. April-June 2007

  2. Oscillations: • Kinematics in weak decays: • 0n double beta decay: ?

  3. solar Kamland Kamland + solar

  4. Favored channel:

  5. Global fit to all existing data atmospheric, reactors (SBL) solar accelerators accelerators reactors (LBL)

  6. To improve on T120n and <mn>: need large source mass lower background, better event signature

  7. beta decay: For more information: Commins and Bucksbaum, Weak interaction of leptons and quarks

  8. Integral electrostatic spectrometer

  9. Mainz frozen T2 source, DE=4.8 eV Troitsk gaseous T2 source, DE=3.5 eV Reported anomaly most likely experimental artifact

  10. Katrin (Karlsruhe) 23 m in final version

  11. T2 injection (27 K) 10 m start data taking 2010

  12. Katrin, main spectrometer transport

  13. heat sink ( 8 mK) phonons i • Wide choice of materials • Good energy resolution crystal Stopping particle (ionizing or non ionizing) Cryogenic detectors (bolometers) Thermistor R(T) measure heat pulse

  14. 187Re 187Os + e- + ne E0=2.5 keV, 43 Gyr, abundance 62.8 % mn < 15 eV at 90 % CL (complication: ‘’ forbidden ’’ transition) Milano: 10 AgReO4 crystals (250-300 mg each) as cryogenic bolometers (T=10 mK) DE(FWHM)=28 eV at 2.5 keV

  15. Next version: MARE (Microcalorimeter Array for a Rhenium Experiment) • 300calorimeters of a few 100 mg, with DE=10-20 eV • in progress, start data taking in 2010 for a few years • R&D for new thermistors • goal 5x104 calorimeters with DE< 5 eV • Like KATRIN, but with completely different systematics!

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