Updates of the Nab Experiment: A Precise Measurement of Unpolarized Neutron Beta Decay

Neutron beta decay provides sensitive means to uncover the details of the weak interaction by evaluating the ratio of axial-vector to vector coupling constants in the standard model, $\lambda = G_A / G_V$, through multiple decay correlations. The Nab experiment at the SNS in ORNL will make precise measurements of the electron-neutrino correlation parameter $a$ and the Fierz interference term $b$ in unpolarized free neutron beta decay. These results aim to deliver an independent determination of $\lambda$ that will sensitively test CKM unitarity, as well as probe exotic electroweak scalar and tensor currents. Nab utilizes the world's largest cryogen-free superconducting magnet spectrometer to guide the decay products to two large area silicon detectors in order to precisely determine the electron energy and proton momentum. Nab has begun data taking, with first physics results expected in the near future. We will present an overview and updates of the Nab experiment, including a discussion of some systematic studies and effects.