10-12 April 2013
INFN - Laboratori Nazionali del Gran Sasso
Europe/Rome timezone

Pattern recognition techniques to reduce backgrounds in the search for the 136Xe double beta decay with gaseous TPCs

10 Apr 2013, 12:50
20m
E. Fermi auditorium (INFN - Laboratori Nazionali del Gran Sasso)

E. Fermi auditorium

INFN - Laboratori Nazionali del Gran Sasso

oral presentation Low background counting techniques Session 3 - Low background counting techniques

Speaker

Dr Francisco Jose Iguaz Gutierrez (University of Zaragoza)

Description

The observation of the neutrinoless double beta decay may provide essential information on the nature of neutrinos. Among the current experimental approaches, a high pressure gaseous TPC is an attractive option for the search of double beta decay due to its good energy resolution and the detailed topological information of each event. We present in this talk a detailed study of the ionization topology of the 136Xe double beta decay events in high pressure xenon, as well as that of the typical competing backgrounds. We define some observables based on graph theory concepts to develop automated discrimination algorithms. Our criteria are able to reduce the background level by about three orders of magnitude in the region of interest of the 136Xe Q_bb for a signal acceptance of 40%. This result provides a quantitative assessment of the benefit of topological information offered by gaseous TPCs for double beta decay search, and proves that it is a promising feature in view of future experiments in the field. Possible ideas for further improvement in the discrimination algorithms and the dependency of these results with the gas diffusion and readout granularity will be also discussed.

Primary author

Dr Francisco Jose Iguaz Gutierrez (University of Zaragoza)

Co-authors

Mr Alfredo Tomas (University of Zaragoza) Ms D.C. Herrera (University of Zaragoza) Dr Gloria Luzon (University of Zaragoza) Dr Hector Gomez (Laboratoire de l’Accélérateur Linéaire (LAL)) Dr Igor Irastorza (U. Zaragoza) Ms Laura Segui (University of Zaragoza) Dr SUSANA CEBRIAN (UNIVERSITY OF ZARAGOZA) Dr Theopisti Dafni (University of Zaragoza)

Presentation Materials

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