Mesure des processus de double désintégration bêta du 100Mo vers l'état excité 0+1 du 100Ru dans l'expérience Nemo3 - Programme de R&D SuperNEMO : mise au point d'un détecteur BiPo pour la mesure de très faibles contaminations de feuilles sources

Abstract : The Nemo3 detector was designed for the study of double beta decay and in particular the search for neutrinoless double beta decay ( bb0v). The quantity of 100Mo in the detector (7 kg) allows also a competitive measurement of the two-neutrino double beta decay ( bb2v) of 100Mo to the excited 0+1 state of 100Ru (eeNy channel). Monte-Carlo simulations of the effect and of all the possible sources of background have been studied in order to determine their contributions to the full Nemo3 experimental data (2003-2011). These one have then been analysed : the bb2v decay half-life has been measured, and a limit on the bb0v decay has been obtained. Moreover, the SuperNEMO experiment aims to reach a sensitivity up to 1026 years on the half-life of neutrinoless double beta decay. The SuperNEMO detector radioactivity has to be as low as possible. Especially radiopurity levels of 2 µBq.kg-1 in 208Tl and 10 µBq.kg-1 in 214Bi are required for the source foils. The gamma-spectrometry can not measure such low contamination levels. Hence, a BiPo dedicated detector has been developped to measure 208Tl and 214Bi contaminations, identi ng the Bi->Po->Pb b-alpha chains. A proof of principle has been performed and the detector background has been measured. Assuming these values, a full BiPo detector of 3:6m2 can achieve the required sensitivities for the SuperNEMO source foils within six months of measurement.
Document type :
Theses
Nuclear Theory. Université de Caen, 2011. French


https://tel.archives-ouvertes.fr/tel-00633435
Contributor : Sandrine Guesnon <>
Submitted on : Tuesday, October 18, 2011 - 3:01:36 PM
Last modification on : Wednesday, January 28, 2015 - 11:06:47 AM

Identifiers

  • HAL Id : tel-00633435, version 1

Collections

Citation

A. Chapon. Mesure des processus de double désintégration bêta du 100Mo vers l'état excité 0+1 du 100Ru dans l'expérience Nemo3 - Programme de R&D SuperNEMO : mise au point d'un détecteur BiPo pour la mesure de très faibles contaminations de feuilles sources. Nuclear Theory. Université de Caen, 2011. French. <tel-00633435>

Export

Share

Metrics

Consultation de
la notice

298

Téléchargement du document

65