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Mesure de précision de la décroissance super‐permise de $^{18}$Ne

Abstract : This thesis focuses on high-precision measurements of the superallowed (0+ $\rightarrow$ 0+ ; T=1) Fermi decay of $^{18}$Ne. Low-energy studies of the weak interaction allow one to test both predictions of the Standard Model, and theoretical models that evaluate corrections to the beta decay strength due to the isospin symmetry breaking by charge-dependent nuclear forces. In this work, a precise measurement of the half-life and branching ratio of the superallowed transition were obtained for the decay of $^{18}$Ne. The half-life, T1/2 = 1.6635 (20) s, was obtained in a beta decay experiment performed at the ISAC facility at TRIUMF in Canada. The branching ratio, BR = 7.29 (5) %, was measured with a high precision gamma-ray detector at the SPIRAL facility of GANIL in France. This latter measurement required the development of a dedicated experimental tape station that will allow similar high-precision measurements to be performed in the future with other superallowed emitters and mirror beta decays.
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Submitted on : Tuesday, September 22, 2015 - 4:21:28 PM
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  • HAL Id : tel-01203286, version 1



Haïfa Bouzomita-Zran. Mesure de précision de la décroissance super‐permise de $^{18}$Ne. Physique Nucléaire Expérimentale [nucl-ex]. Université de Caen Normandie, 2015. Français. ⟨tel-01203286⟩



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