Description du sujet de thèse
Domaine
Physique corpusculaire et cosmos
Sujets de thèse
CUPID-Stage I: Detector optimization and analysis in the context of a next generation 0nbb search
Contrat
Thèse
Description de l'offre
The CUPID experiment (CUORE Upgrade with Particle IDentification) aims to achieve unprecedented sensitivity for the detection of neutrinoless double beta decay (0nßß) using an array of 1596 lithium molybdate (Li2MoO4) crystals of ~450 kg mass. If detected this process would be a direct observation new physics in the lepton sector: in example it violates lepton number by 2 units. Dependent on the model it can provide valuable insight into the neutrino mass-scale and possbily to matter generation in the Universe through leptogenesis.
The use of lithium molybdate for this study is particularly advantageous due to their scintillation properties and the high Q-value of the decay process, which lies above most environmental gamma backgrounds. The CUPID experiment employs this material as cryogenic calorimetric detectors, where the heat signal from particle interactions of O (100 microK/MeV) are registered in a sensitive thermistor at a temperature of ~10 mK. Thanks to the high Q-value Mo-100 features a particularly high sensitivity in terms of large phase space factor and nuclear transition matrix element. This will also allow for precision studies and tests of the standard model, through analyses of the shape of another process: the so-called 2 neutrino double beta decay (2nbb), which is a standard model allowed process. However, this rare process (half-life of 7x10^17yr) is not only an interesting particle/nuclear physics target, it is also expected to contribute the most important background in CUPID: the random coincidence of two events adding up in energy to the Q-value of the 0nßß search.
CUPID aims to deploy its new detector array in two phases: An initial detector array with 1/3 of the mass will be deployed by 2030. In the mean time several tower scale measurement and optimization campaigns during the time of this thesis project will allow to analyze and optimize the detector performance of the CUPID detector modules. The further suppression of this so called pile-up background through detector optimization (acting on the sensor attachment of the light detector with a robotic assembly station developed at CEA) and advanced analysis techniques within this thesis will allow to enhance the sensitivity and science reach of CUPID. A further extension of the analysis techniques developed in this thesis to the processing of an array of O(1000) detectors will be tested with the existing TeO2 detecor array of CUORE. In the context of this process the developed analysis techniques will contribute to the final science analyses of CUORE, the leading experiment for 0nßß search with Te-130.
Université / école doctorale
PHENIICS (PHENIICS)
Paris-Saclay
Localisation du sujet de thèse
Site
Saclay
Critères candidat
Formation recommandée
M2
Demandeur
Disponibilité du poste
01/10/2026
Personne à contacter par le candidat
Schmidt Benjamin < E-Mail aus Sicherheitsgründen gelöscht >
CEA
DRF/IRFU
CEA Paris-Saclay, Bat 141, Pce 26A
91191 Gif-sur-Yvette Cedex
Tuteur / Responsable de thèse
Schmidt Benjamin < E-Mail aus Sicherheitsgründen gelöscht >
CEA
DRF/IRFU
CEA Paris-Saclay, Bat 141, Pce 26A
91191 Gif-sur-Yvette Cedex
En savoir plus
https://cupidexperiment.org/publications/
Domaine
Physique corpusculaire et cosmos
Sujets de thèse
CUPID-Stage I: Detector optimization and analysis in the context of a next generation 0nbb search
Contrat
Thèse
Description de l'offre
The CUPID experiment (CUORE Upgrade with Particle IDentification) aims to achieve unprecedented sensitivity for the detection of neutrinoless double beta decay (0nßß) using an array of 1596 lithium molybdate (Li2MoO4) crystals of ~450 kg mass. If detected this process would be a direct observation new physics in the lepton sector: in example it violates lepton number by 2 units. Dependent on the model it can provide valuable insight into the neutrino mass-scale and possbily to matter generation in the Universe through leptogenesis.
The use of lithium molybdate for this study is particularly advantageous due to their scintillation properties and the high Q-value of the decay process, which lies above most environmental gamma backgrounds. The CUPID experiment employs this material as cryogenic calorimetric detectors, where the heat signal from particle interactions of O (100 microK/MeV) are registered in a sensitive thermistor at a temperature of ~10 mK. Thanks to the high Q-value Mo-100 features a particularly high sensitivity in terms of large phase space factor and nuclear transition matrix element. This will also allow for precision studies and tests of the standard model, through analyses of the shape of another process: the so-called 2 neutrino double beta decay (2nbb), which is a standard model allowed process. However, this rare process (half-life of 7x10^17yr) is not only an interesting particle/nuclear physics target, it is also expected to contribute the most important background in CUPID: the random coincidence of two events adding up in energy to the Q-value of the 0nßß search.
CUPID aims to deploy its new detector array in two phases: An initial detector array with 1/3 of the mass will be deployed by 2030. In the mean time several tower scale measurement and optimization campaigns during the time of this thesis project will allow to analyze and optimize the detector performance of the CUPID detector modules. The further suppression of this so called pile-up background through detector optimization (acting on the sensor attachment of the light detector with a robotic assembly station developed at CEA) and advanced analysis techniques within this thesis will allow to enhance the sensitivity and science reach of CUPID. A further extension of the analysis techniques developed in this thesis to the processing of an array of O(1000) detectors will be tested with the existing TeO2 detecor array of CUORE. In the context of this process the developed analysis techniques will contribute to the final science analyses of CUORE, the leading experiment for 0nßß search with Te-130.
Université / école doctorale
PHENIICS (PHENIICS)
Paris-Saclay
Localisation du sujet de thèse
Site
Saclay
Critères candidat
Formation recommandée
M2
Demandeur
Disponibilité du poste
01/10/2026
Personne à contacter par le candidat
Schmidt Benjamin < E-Mail aus Sicherheitsgründen gelöscht >
CEA
DRF/IRFU
CEA Paris-Saclay, Bat 141, Pce 26A
91191 Gif-sur-Yvette Cedex
Tuteur / Responsable de thèse
Schmidt Benjamin < E-Mail aus Sicherheitsgründen gelöscht >
CEA
DRF/IRFU
CEA Paris-Saclay, Bat 141, Pce 26A
91191 Gif-sur-Yvette Cedex
En savoir plus
https://cupidexperiment.org/publications/
