Monte Carlo simulations of detectors background and analysis of background characteristics of the SuperNEMO experiment in the Modane underground laboratory

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A90107%2F21%3A00357737" target="_blank" >RIV/68407700:90107/21:00357737 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.theses.fr/2021BORD0253" target="_blank" >https://www.theses.fr/2021BORD0253</a>

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Monte Carlo simulations of detectors background and analysis of background characteristics of the SuperNEMO experiment in the Modane underground laboratory

Popis výsledku v původním jazyce

The recent discovery of a non-zero mass for neutrinos with the observation of oscillations renews the interest to search for double beta decay without neutrino emission. This is the best experimental approach to probe the nature of neutrinos - Dirac or Majorana - and their mass scale. SuperNEMO is an experiment based on the use of a tracker and a calorimeter in order to individually detect the two electrons emitted during the decay. The first SuperNEMO demonstrator module is located at the Underground Laboratory in Modane. Its background noise rejection technique is based on the reconstruction of the topology of events as well as an upstream suppression of background noise by a selection of radiopure components and the use of passive shielding.Part of this thesis is dedicated to the estimation of the radioactive background noise surrounding the Underground Laboratory of Modane, whose radiogenic neutrons produced by fission of uranium and thorium isotopes, as well as by reaction (alpha, not). The latter are an important ingredient for Monte Carlo simulations of the background noise induced by high-energy gamma radiation. A problem of simulation of gamma cascades by radiative neutron capture is notably discussed with the development of a solution. Another part of the work concerns radiation attenuation simulations through different passive shielding configurations and geometries, in order to to optimize the final shielding of the SuperNEMO demonstrator module.

Název v anglickém jazyce

Monte Carlo simulations of detectors background and analysis of background characteristics of the SuperNEMO experiment in the Modane underground laboratory

Popis výsledku anglicky

The recent discovery of a non-zero mass for neutrinos with the observation of oscillations renews the interest to search for double beta decay without neutrino emission. This is the best experimental approach to probe the nature of neutrinos - Dirac or Majorana - and their mass scale. SuperNEMO is an experiment based on the use of a tracker and a calorimeter in order to individually detect the two electrons emitted during the decay. The first SuperNEMO demonstrator module is located at the Underground Laboratory in Modane. Its background noise rejection technique is based on the reconstruction of the topology of events as well as an upstream suppression of background noise by a selection of radiopure components and the use of passive shielding.Part of this thesis is dedicated to the estimation of the radioactive background noise surrounding the Underground Laboratory of Modane, whose radiogenic neutrons produced by fission of uranium and thorium isotopes, as well as by reaction (alpha, not). The latter are an important ingredient for Monte Carlo simulations of the background noise induced by high-energy gamma radiation. A problem of simulation of gamma cascades by radiative neutron capture is notably discussed with the development of a solution. Another part of the work concerns radiation attenuation simulations through different passive shielding configurations and geometries, in order to to optimize the final shielding of the SuperNEMO demonstrator module.

Druh

O - Ostatní výsledky

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

—

Návaznosti

—

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů