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- W785632262 abstract "The Germanium Detector Array (Gerda) experiment, located underground at the INFNLaboratori Nazionali del Gran Sasso (LNGS) in Italy, deploys high-purity germanium detectorsto search for the neutrinoless double beta-decay (0vbb) of 76Ge. An observation ofthis lepton number violating process, which is expected by many extensions of the StandardModel, would not only generate a fundamental shift in our understanding of particlephysics, but also unambiguously prove the neutrino to have a non-vanishing Majorana masscomponent.A first phase of data recording lasted from November 2011 to May 2013 - resultingin a total exposure (defined as the product of detector mass and measurement time) of21.6 kg*yr. Within this thesis a thorough study of this data with special emphasis on thedevelopment and scrutiny of an active background suppression technique by means of asignal shape analysis has been performed. Among several investigated multivariate approaches,particularly a selection algorithm based on an artificial neural network is foundto yield the best performance; i.a. the background index close to the Q-value of the 0vbb-decay could be suppressed by 45% to 1*10^(-2) cts/(keV*kg*yr), while still retaining a considerablyhigh signal survival fraction of (83+/-3)% leading to a significant improvementof the experimental sensitivity. The efficiency is derived by a simulation and further validatedby substantiated consistency checks availing themselves of measurements taken withdifferent calibration sources and physics data. No signal is observed and a new lower limitof T(90%C.L.)>2.2*10^25 yr for the half-life of neutrinoless double beta-decay of 76Ge isestablished." @default.
- W785632262 created "2016-06-24" @default.
- W785632262 creator A5007158051 @default.
- W785632262 date "2014-07-09" @default.
- W785632262 modified "2023-09-24" @default.
- W785632262 title "Search for the neutrinoless double ß-decay in Gerda Phase I using a Pulse Shape Discrimination technique" @default.
- W785632262 doi "https://doi.org/10.11588/heidok.00017149" @default.
- W785632262 hasPublicationYear "2014" @default.
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