B. Märkisch, H. Mest, H. Saul, X. Wang, H. Abele, D. Dubbers, M. Klopf, A. Petoukhov, C. Roick, T. Soldner, D Werder:
"Measurement of the Weak Axial-Vector Coupling Constant in the Decay of Free Neutrons Using a Pulsed Cold Neutron Beam";
Physical Review Letters, 122 (2019), 242501; S. 1 - 7.

Kurzfassung englisch:
We present a precision measurement of the axial-vector coupling constant gA in the decay of polarized free neutrons. For the first time, a pulsed cold neutron beam was used for this purpose. By this method, leading sources of systematic uncertainty are suppressed. From the electron spectra we obtain λ = gA/gV = −1.27641(45)stat(33)sys, which confirms recent measurements with improved precision. This corresponds to a value of the parity violating beta asymmetry parameter of A0 = −0.11985(17)stat(12)sys. We discuss implications on the Cabibbo-Kobayashi-Maskawa matrix element Vud and derive a limit on left-handed tensor interaction.

Beta decay; Leptonic, semileptonic & radiative decays; Neutron physics; P-symmetry; Polarization; Particle decays; Precision measurements; Scintillators

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