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Low background detection technics
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The double beta decay whithout neutrino emission is a fundamental process to study the properties of elementary particles and the fundamental interactions. The neutrino flavor oscillations observed with a large number of experiments using different detection techniques prove that neutrinos are massive particles. However, numerous questions remain whithout any answer, espacially on the absolute mass scale, the CP violation in the leptonic sector and on the nature of neutrinos: Dirac or Majorana.
This last hypothesis will considerably improve our knowledge on the mass generation mechanisms for the fermions and on the matter-antimatter asymmetry in the universe and can be accessible only through the double beta decay process playing a central role in particle and astroparticle physics. Numerous experiments in the world are working to the detection of the double beta decay process. Various techniques are used such scintillation, gaz detector, solid state semi-conductor... In this working group, an important thematics is dedicated to innovative and novel technique for detection of rare process. A new technology based on calorimetric approach (source and detector coinciding) allows to study the double beta decay process for a large variety of isotopes with high energy resolution. This technology is based on sophiticated detectors called bolometers and working at very low temperature. These detectors have a strong discovery potential and can cover the inverted neutrino mass hierarchy.

Measured Quantity

T^{0 \nu}_{1/2}^{-1} \simeq G^{0\nu} \abs{M^{0\nu}} \left( \frac{< m_\nu>}{m_e} \right)^2

Status of some double beta decay experiments
Experiment Isotope M (kg) Sensitivity T1/2 Sensitivity m (meV) Status
CUORE 130Te 11 5×10^24 230–570 in progress
200 10^26 50–130 in progress
GERDA 76Ge 40 6×10^27 80-190 in progress
1000 10^26 15-35 R&D
MAJORANA 76Ge 30 1.5×10^26 90-200 in progress
1000 10^26 15-35 R&D
EXO 136Xe 200 4×10^25 100-240 in progress
5000 2x 10^27 14-33 R&D
SuperNEMO 82 Se 7 6.5×10^24 240-560 in progress
100-200 1-2x 10^26 44-140 R&D
KamLAND-Zen 136Xe 320 2×10^26 44-105 in progress
1000 6x10^26 25-60 R&D
SNO+ 130Te 800 10^26 50-130 in progress
8000 10^27 16-40 R&D

A.Barabasch, arXiv:1403.2870v1

Background

T^{0 \nu}_{1/2} \simeq  \frac{a \epsi}{W} \sqrt{\frac{M.t}{\Delta E B}}

Next generation of experiments

Status of some double beta decay experiments
Experiment Type of detector
Experiment Calorimeter
Experiment Tracker Calorimeter

References
[1] Neutrinoless Double Beta Decay, the Inverted Hierarchy and Precision Determination of theta(12) - Alexander Dueck, Werner Rodejohann (Heidelberg, Max Planck Inst.), Kai Zuber (Dresden, Tech. U.). Mar 2011. 25 pp.
DOI:10.1103/PhysRevD.83.113010
[2] Review of double beta decay experiments - A.S. Barabash. Mar 12, 2014. 6 pp.
e-Print : arXiv:1403.2870
[3] Fabrice Piquemal - Talk given at Large TPC conference.

Subsections

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