Thèse soutenue

Développement d'un faisceau de positrons lents pour des mesures de l'orthopositronium et de spectroscopie de temps de vie
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Auteur / Autrice : Thomas Anthonioz
Direction : Daniel Sillou
Type : Thèse de doctorat
Discipline(s) : Physique des particules
Date : Soutenance en 2007
Etablissement(s) : Lyon 1

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Résumé

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A slow positron beam was constructed within a collaboration between ETH Zürich, INR Moscow, LMOPS Le Bourget-du-Lac and LAPP Annecy. The use of this beam for Positron Annihilation Lifetime Spectroscopy measurements was studied for 2 configurations : the developpement of a pulsed beam, the use of secondary electrons. The first part of this work gives a review of the properties of positron and positronium,e+e- bound state. After a brief description of the apparatus, the 2 beam configurations are detailed. The pulse beam consists in a time compression of positrons bunches. Simulations were carried out to select the experimental parameters. The development of the second mode is based on the detection of secondary electrons. Low energy phenomena were introduced in the simulations. The good results obtained for time resolution (-500 ps for both configurations) allowed us to perform measurements for solid state physics. Both configurations allow wide prospects in use and development of the beam