Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons

Details Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons

2010-07-22

arxiv.org/abs/1007.3790v2

Phys.Rev.Lett.105:181803,2010

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.105.181803

A precise measurement of the neutron decay $\beta$-asymmetry $A_0$ has been carried out using polarized ultracold neutrons (UCN) from the pulsed spallation UCN source at the Los Alamos Neutron Science Center (LANSCE). Combining data obtained in 2008 and 2009, we report $A_0 = -0.11966 \pm 0.00089_{-0.00140}^{+0.00123}$, from which we determine the ratio of the axial-vector to vector weak coupling of the nucleon $g_A/g_V = -1.27590_{-0.00445}^{+0.00409}$.

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