26-30 July 2010
Montpellier 2 University
Europe/Paris timezone

Background rejection and sensitivity for new generation Ge detectors experiments

27 Jul 2010, 15:50
20m
Amphithéatre Dumontet (Montpellier 2 University)

Amphithéatre Dumontet

Montpellier 2 University

Place Eugene Bataillon, 34095 Montpellier Cedex 5 FRANCE
Talk Dark Matter Direct Searches Parallel session : Direct Searches 3

Speaker

Dr Héctor Gómez-Maluenda (University of Zaragoza)

Description

Germanium detectors have been used in several experiments searching for Rare Events due to their good features (detection efficiency, energy resolution or robustness). New generation detectors, like broad energy detectors or segmented ones, could improve the sensitivity of this kind of experiments since different background rejection techniques could be developed without losing detection efficiency. Within these techniques, analysis of the pulse shapes in a segmented detector, in the segment where the energy deposit happens and in the adjacent ones (the so-called net and induced signals respectively), seems to be one of the most powerful ones. Applying to 76Ge double beta decay region of interest (2.0-2.1 MeV), a set of routines for pulse generation and analysis has allowed to estimate that the background could be reduced by a factor 25, keeping a detection efficiency for neutrinoless double beta decay events of 76.3% using 2kg detectors. A summary of the development of pulse generation and analysis routines (both for net and induced signals) will be given, showing the rejection factors and detection efficiency values obtained for the different configurations considered.

Primary author

Dr Héctor Gómez-Maluenda (University of Zaragoza)

Co-authors

Prof. José Ángel Villar (University of Zaragoza) Dr Susana Cebrián (University of Zaragoza)

Presentation Materials