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Working Group 4 : Accelerators, Research and Development, detection techniques

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Tracker-Calorimeter

The tracker-calorimer technique used in NEMO3 has been proposed for a new experiment at higher mass scale SuperNEMO (a demonstrator equipped with 7 kg of 82Se is foreseen) allowing a geometrical tracks reconstruction for the electron emitted by the source with a low pressure gas track detector; their energy is measured by a calorimeter. The magnetic field allow to measure the particle charge and the time of fight, which improve the event reconstruction. The high reconstruction capability allow to reach an extremely low background compare to other techniques. Due to a limited energy resolution, the source has to be as thin as possible to reduce the self absorption.
All the kinematical informations (angular distribution, individual electron energy) are required to understand the origin of the double beta decay process. From the technological point of view, a BiPo detector is being elaborated whose sensitivity reach a level contamination of 1 microBq/kg in the source foils. The detector concept is based on the detection of the delayed alpha-beta signal used to identify the Bismuth-Polonium decay chain coming from natural radioactivity. This detector is essential to select low contanimated material used to build thin source foils.

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