{beta} asymmetry parameter in the decay of {sup 114}In

The {beta}-asymmetry parameter A-tilde for the pure Gamow-Teller decay of {sup 114}In is reported. The low-temperature nuclear orientation method was combined with a GEANT4-based simulation code allowing us, for the first time, to address in detail the effects of scattering and the magnetic field. The result, A-tilde=-0.994{+-}0.010{sub stat}{+-}0.010{sub syst}, constitutes the most accurate value for the asymmetry parameter of a nuclear {beta} transition to date. The value is in agreement with the Standard Model prediction of A-tilde=-1 and provides new limits on tensor-type charged weak currents.