부산대학교 도서관

In the standard model, the weak interaction is formulated with a purely vector-axial-vector (V-A) structure. Without restriction on the chirality of the neutrino, the most general limits on tensor currents from nuclear β decay are dominated by a single measurement of the β-v¯ correlation in 6He β decay dating back over a half century. In the present work, the β-v¯-α correlation in the p decay of 8Li and subsequent a-particle breakup of the 8Be* daughter was measured. The results are consistent with a purely V-A interaction and in the case of couplings to right-handed neutrinos (CT = -C'T) limits the tensor fraction to ∣CT/CT∣2 < 0.011 (95.5% C.L.). The measurement confirms the 6He result using a different nuclear system and employing modem ion-trapping techniques subject to different systematic uncertainties. [ABSTRACT FROM AUTHOR]