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We present a precision measurement of the axial-vector coupling constant$g_A$ in the decay of polarized free neutrons. For the first time, a pulsedcold neutron beam was used for this purpose. By this method, leading sources ofsystematic uncertainty are suppressed. From the electron spectra we obtain$\lambda = g_A/g_V = -1.27641(45)_\mathrm{stat}(33)_\mathrm{sys}$ whichconfirms recent measurements with improved precision. This corresponds to avalue of the parity violating beta asymmetry parameter of $A_0 =-0.11985(17)_\mathrm{stat}(12)_\mathrm{sys}$. We discuss implications on theCKM matrix element $V_{ud}$ and derive a limit on left-handed tensorinteraction.

Measurement of the Weak Axial-Vector Coupling Constant in the Decay of Free Neutrons Using a Pulsed Cold Neutron Beam