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)
