Measuring Ionization Electron Drift-Lifetime using cosmic ray muons in MicroBooNE

MicroBooNE is an 85-ton Liquid Argon Time Projection Chamber (LArTPC) located at Fermilab with the main goal of studying the anomalous electromagnetic excess observed by its predecessor experiment, MiniBooNE. LArTPCs offer exceptional calorimetric and positioning resolution capabilities for studying neutrino interactions. A fundamental requirement for the performance of such detectors is to maintain extremely low levels of electro-negative contaminants such as oxygen and water in liquid argon, on the order of parts per trillion. If a high level of liquid argon purity is not maintained, particle identification and path reconstructions can be negatively affected. The electron drift-lifetime is inversely proportional to the impurity concentration and hence provides a direct measurement of the liquid argon impurity content. In this talk, I will present an ongoing effort to measure the electron drift-lifetime using cosmic ray muons along with preliminary extracted daily lifetime values which indicate the excellent levels of liquid argon purity achieved by MicroBooNE over its data taking period.