Measurement of the longitudinal diffusion of ionization electrons in the MicroBooNE detector Abratenko, P. García Gámez, Diego MicroBooNE Collaboration Charge transport and multiplication in liquid media Noble liquid detectors (scintillation, ionization, double-phase) Time projection Chambers (TPC) This document was prepared by the MicroBooNE collaboration using the resources of the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. MicroBooNE is supported by the following: the U.S. Department of Energy, Office of Science, Offices of High Energy Physics and Nuclear Physics; the U.S. National Science Foundation; the Swiss National Science Foundation; the Science and Technology Facilities Council (STFC), part of the United Kingdom Research and Innovation; and The Royal Society (United Kingdom). Additional support for the laser calibration system and cosmic ray tagger was provided by the Albert Einstein Center for Fundamental Physics, Bern, Switzerland. Accurate knowledge of electron transport properties is vital to understanding the information provided by liquid argon time projection chambers (LArTPCs). Ionization electron drift-lifetime, local electric field distortions caused by positive ion accumulation, and electron diffusion can all significantly impact the measured signal waveforms. This paper presents a measurement of the effective longitudinal electron diffusion coefficient, D-L, in MicroBooNE at the nominal electric field strength of 273.9 V/cm. Historically, this measurement has been made in LArTPC prototype detectors. This represents the first measurement in a large-scale (85 tonne active volume) LArTPC operating in a neutrino beam. This is the largest dataset ever used for this measurement. Using a sample of similar to 70,000 through-going cosmic ray muon tracks tagged with MicroBooNE's cosmic ray tagger system, we measure D-L = 3.74(-0.29)(+0.28) cm(2)/s. 2021-10-27T10:32:50Z 2021-10-27T10:32:50Z 2021-09-22 info:eu-repo/semantics/article The MicroBooNE collaboration... [et al.] 2021 JINST 16 P09025. [https://doi.org/10.1088/1748-0221/16/09/P09025] http://hdl.handle.net/10481/71134 10.1088/1748-0221/16/09/P09025 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Institute of Physics Publishing