Precision measurements in the weak interaction framework: development of realistic simulations for the LPCTrap device installed at GANIL

Abstract : This work belongs to the effort presently deployed to measure the angular correlation parameter aβν in three nuclear beta decays (6He+, 35Ar+et 19Ne+). The V-A structure of the weak interaction implies that aβν = +1 for a pure Fermi transition and aβν = -1/3 for a pure Gamow-Teller transition. A thorough measurement of this parameter to check any deviation from these values may lead to the discovery of possible exotic currents. Furthermore, the measurement of aβν in mirror transitions allows the extraction of Vud, the first element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix. The LPCTrap apparatus, installed at GANIL, is designed to ready a continuous ion beam for injection in a dedicated Paul trap. This latter device allows to have a quasi-ponctual source from which the decay products are detected in coincidence. It is from the study of the recoil ion time-of- flight (TOF) distribution that aβν is withdrawn and, since 2010, the associated Shake-Off (SO) probabilities. This study requires the complete simulation of the LPCTrap experiments. The major part of this work is dedicated to such simulations, especially to the modeling of the trapped ion cloud dynamic. The Clouda program, which takes advantage of graphics processing unit (GPU), was developed in this context and its full characterization is presented here. Three important aspects are addressed: the electromagnetic trapping field, the realistic collisions between the ions and the buffer gas atoms and the space charge effect. The present work shows the importance of these simulations to increase the control of the systematic errors on aβν.
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X. Fabian. Precision measurements in the weak interaction framework: development of realistic simulations for the LPCTrap device installed at GANIL. Nuclear Experiment [nucl-ex]. Université de Caen Normandie, 2015. English. ⟨tel-01288412⟩

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