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Analysis method for the search for neutrinoless double beta decay in the NEMO3 experiment: study of the background and first results; Methode d'analyse pour la recherche de la double desintegration {beta} sans emission de neutrinos dans l'experience NEMO3. Etude du bruit de fond et premiers resultats

Abstract

The NEMO3 detector, installed in the Frejus Underground Laboratory, is dedicated to the study of neutrinoless double beta decay: the observation of this process would sign the massive and Majorana nature of neutrino. The experiment consists in very thin central source foils (the total mass is equal to 10 kg), a tracking detector made of drift cells operating in Geiger mode, a calorimeter made of plastic scintillators associated to photomultipliers, a coil producing a 30 gauss magnetic field and two shields, dedicated to the reduction of the {gamma}-ray and neutron fluxes. In the first part, I describe the implications of several mechanisms, related to trilinear R-parity violation, on double beta decay. The second part is dedicated to a detailed study of the tracking detector of the experiment: after a description of the different working tests, I present the determination of the characteristics of the tracking reconstruction (transverse and longitudinal resolution, by Geiger cell and precision on vertex determination, charge recognition). The last part corresponds to the analysis of the data taken by the experiment. On the one hand, an upper limit on the Tl{sup 208} activity of the sources has been determined: it is lower than 68 mBq/kg, at 90%  More>>
Authors:
Publication Date:
Apr 15, 2003
Product Type:
Thesis/Dissertation
Report Number:
FRNC-TH-6186
Resource Relation:
Other Information: TH: These; 68 refs
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BETA DETECTION; BISMUTH 214; DATA ANALYSIS; DOUBLE BETA DECAY; ELECTRON DETECTION; INVARIANCE PRINCIPLES; MOLYBDENUM 100; NEUTRINO OSCILLATION; NEUTRINOS; SUPERSYMMETRY; THALLIUM 208
OSTI ID:
20711789
Research Organizations:
Paris-11 Univ., 91 - Orsay (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR0504091026165
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
222 pages
Announcement Date:
May 05, 2006

Citation Formats

Etienvre, A I. Analysis method for the search for neutrinoless double beta decay in the NEMO3 experiment: study of the background and first results; Methode d'analyse pour la recherche de la double desintegration {beta} sans emission de neutrinos dans l'experience NEMO3. Etude du bruit de fond et premiers resultats. France: N. p., 2003. Web.
Etienvre, A I. Analysis method for the search for neutrinoless double beta decay in the NEMO3 experiment: study of the background and first results; Methode d'analyse pour la recherche de la double desintegration {beta} sans emission de neutrinos dans l'experience NEMO3. Etude du bruit de fond et premiers resultats. France.
Etienvre, A I. 2003. "Analysis method for the search for neutrinoless double beta decay in the NEMO3 experiment: study of the background and first results; Methode d'analyse pour la recherche de la double desintegration {beta} sans emission de neutrinos dans l'experience NEMO3. Etude du bruit de fond et premiers resultats." France.
@misc{etde_20711789,
title = {Analysis method for the search for neutrinoless double beta decay in the NEMO3 experiment: study of the background and first results; Methode d'analyse pour la recherche de la double desintegration {beta} sans emission de neutrinos dans l'experience NEMO3. Etude du bruit de fond et premiers resultats}
author = {Etienvre, A I}
abstractNote = {The NEMO3 detector, installed in the Frejus Underground Laboratory, is dedicated to the study of neutrinoless double beta decay: the observation of this process would sign the massive and Majorana nature of neutrino. The experiment consists in very thin central source foils (the total mass is equal to 10 kg), a tracking detector made of drift cells operating in Geiger mode, a calorimeter made of plastic scintillators associated to photomultipliers, a coil producing a 30 gauss magnetic field and two shields, dedicated to the reduction of the {gamma}-ray and neutron fluxes. In the first part, I describe the implications of several mechanisms, related to trilinear R-parity violation, on double beta decay. The second part is dedicated to a detailed study of the tracking detector of the experiment: after a description of the different working tests, I present the determination of the characteristics of the tracking reconstruction (transverse and longitudinal resolution, by Geiger cell and precision on vertex determination, charge recognition). The last part corresponds to the analysis of the data taken by the experiment. On the one hand, an upper limit on the Tl{sup 208} activity of the sources has been determined: it is lower than 68 mBq/kg, at 90% of confidence level. On the other hand, I have developed and tested on these data a method in order to analyse the neutrinoless double beta decay signal; this method is based on a maximum of likelihood using all the available information. Using this method, I could determine a first and very preliminary upper limit on the effective mass of the neutrino. (author)}
place = {France}
year = {2003}
month = {Apr}
}