Mesure du coefficient de correlation angulaire béta-neutrino dans la decroissance de l'$^{6}$He à l'aide d'un piège de Paul

Abstract : The central topic of this work is the study of the properties and the implementation of a Paul trap used
for the measurement of the beta-neutrino angular correlation parameter in the decay of 6He. This
coefficient provides a signature of the nature of the interactions involved in the weak interaction. The
value of this coefficient can be deduced from the kinematical distribution of the decay events. An
electromagnetic trap is used for the trapping of 6He+ ions in a small volume. This trap has an open
geometry that enables the detection in coincidence of the electron and the recoil ion emitted in the beta
decay. A dedicated detection set up is used for the measurement of the electron energy, the ion time of
flight and the position of the two particles for each event.
A general description of the LPCTrap facility and of its performances is presented and shows that this
set up is able to fulfill the proposed measurement. Especially, a comparison is made between the
characteristics of the ion cloud obtained from Monte Carlo simulations and the experimental
measurements with a good agreement. More than 100 000 coincident events have been recorded
during the first experiment. A preliminary analysis of these results is shown. It includes a description
of the different observables as well as a comparison between the experimental time of flight spectrum
and the simulated spectrum. These data will allow a measurement of the angular correlation parameter
with a statistical error smaller than 2 %.
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Submitted on : Tuesday, August 28, 2007 - 2:57:55 PM
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  • HAL Id : tel-00168458, version 1

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A. Mery. Mesure du coefficient de correlation angulaire béta-neutrino dans la decroissance de l'$^{6}$He à l'aide d'un piège de Paul. Physique Nucléaire Théorique [nucl-th]. Université de Caen, 2007. Français. ⟨tel-00168458⟩

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