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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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?


solar

Kamland Kamland + solar



Global fit to all existing data

atmospheric, reactors (SBL) solar

accelerators accelerators reactors (LBL)


To improve on T120n and <mn>: need large source mass

lower background, better event signature


beta decay:

For more information:

Commins and Bucksbaum,

Weak interaction of leptons and quarks



Mainz

frozen T2 source, DE=4.8 eV

Troitsk

gaseous T2 source, DE=3.5 eV

Reported anomaly most likely experimental

artifact


Katrin

(Karlsruhe)

23 m in final version


T2 injection (27 K)

10 m

start data taking 2010



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


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


  • 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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