Measurement of the beta-nu correlation coefficient a(beta nu) in the beta decay of trapped He-6(+) ions
Résumé
We have measured the β-ν angular correlation in the β decay of 6He+ ions using a transparent Paul trap. The 6He+ ions, produced at GANIL, were first cooled and bunched before being injected in the LPCTrap setup. The angular correlation was inferred from the time of flight of recoil nuclei detected in coincidence with the β particles. The detection system gives access to the full β decay kinematics, providing means to check the data reliability and to reject a large fraction of background. We find aβν = −0.3335(73)stat(75)syst, in agreement with the standard model prediction for a pure Gamow-Teller transition.
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