%AAbratenko, P.%AAn, R.%AAnthony, J.%AAsaadi, J.%AAshkenazi, A.%ABalasubramanian, S.%ABaller, B.%ABarnes, C.%ABarr, G.%ABasque, V.%ABathe-Peters, L.%ABenevides Rodrigues, O.%ABerkman, S.%ABhanderi, A.%ABhat, A.%ABishai, M.%ABlake, A.%ABolton, T.%ACamilleri, L.%ACaratelli, D.%ACaro Terrazas, I.%ACastillo Fernandez, R.%ACavanna, F.%ACerati, G.%AChen, Y.%AChurch, E.%ACianci, D.%AConrad, J.M.%AConvery, M.%ACooper-Troendle, L.%ACrespo-Anadón, J.I.%ADel Tutto, M.%ADennis, S.R.%ADevitt, D.%ADiurba, R.%ADorrill, R.%ADuffy, K.%ADytman, S.%AEberly, B.%AEreditato, A.%AEvans, J.J.%AFine, R.%AFiorentini Aguirre, G.A.%AFitzpatrick, R.S.%AFleming, B.T.%AFoppiani, N.%AFranco, D.%AFurmanski, A.P.%AGarcia-Gamez, D.%AGardiner, S.%AGe, G.%AGollapinni, S.%AGoodwin, O.%AGramellini, E.%AGreen, P.%AGreenlee, H.%AGu, W.%AGuenette, R.%AGuzowski, P.%AHagaman, L.%AHall, E.%AHamilton, P.%AHen, O.%AHorton-Smith, G.A.%AHourlier, A.%AItay, R.%AJames, C.%AJi, X.%AJiang, L.%AJo, J.H.%AJohnson, R.A.%AJwa, Y.-J.%AKamp, N.%AKaneshige, N.%AKaragiorgi, G.%AKetchum, W.%AKirby, M.%AKobilarcik, T.%AKreslo, I.%ALaZur, R.%ALepetic, I.%ALi, K.%ALi, Y.%ALin, K.%ALister, A.%ALittlejohn, B.R.%ALouis, W.C.%ALuo, X.%AManivannan, K.%AMariani, C.%AMarsden, D.%AMarshall, J.%AMartinez Caicedo, D.A.%AMason, K.%AMastbaum, A.%AMcConkey, N.%AMeddage, V.%AMettler, T.%AMiller, K.%AMills, J.%AMistry, K.%AMogan, A.%AMohayai, T.%AMoon, J.%AMooney, M.%AMoor, A.F.%AMoore, C.D.%AMora Lepin, L.%AMousseau, J.%AMurphy, M.%ANaples, D.%ANavrer-Agasson, A.%ANeely, R.K.%ANowak, J.%ANunes, M.%APalamara, O.%APaolone, V.%APapadopoulou, A.%APapavassiliou, V.%APate, S.F.%APaudel, A.%APavlovic, Z.%APiasetzky, E.%APonce-Pinto, I.D.%APrince, S.%AQian, X.%ARaaf, J.L.%ARadeka, V.%ARafique, A.%AReggiani-Guzzo, M.%ARen, L.%ARice, L.C.J.%ARochester, L.%ARodriguez Rondon, J.%ARogers, H.E.%ARosenberg, M.%ARoss-Lonergan, M.%AScanavini, G.%ASchmitz, D.W.%ASchukraft, A.%ASeligman, W.%AShaevitz, M.H.%ASharankova, R.%ASinclair, J.%ASmith, A.%ASnider, E.L.%ASoderberg, M.%ASöldner-Rembold, S.%ASpentzouris, P.%ASpitz, J.%AStancari, M.%ASt. John, J.%AStrauss, T.%ASutton, K.%ASword-Fehlberg, S.%ASzelc, A.M.%ATagg, N.%ATang, W.%ATerao, K.%AThorpe, C.%ATotani, D.%AToups, M.%ATsai, Y.-T.%AUchida, M.A.%AUsher, T.%AVan De Pontseele, W.%AViren, B.%AWeber, M.%AWei, H.%AWilliams, Z.%AWolbers, S.%AWongjirad, T.%AWospakrik, M.%AWright, N.%AWu, W.%AYandel, E.%AYang, T.%AYarbrough, G.%AYates, L.E.%AZeller, G.P.%AZennamo, J.%AZhang, C.%BJournal Name: Journal of Instrumentation; Journal Volume: 16; Journal Issue: 09 %D2021%I %JJournal Name: Journal of Instrumentation; Journal Volume: 16; Journal Issue: 09 %K %MOSTI ID: 10320547 %PMedium: X %TMeasurement of the longitudinal diffusion of ionization electrons in the MicroBooNE detector %XAbstract 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 ∼70,000 through-going cosmic ray muon tracks tagged with MicroBooNE's cosmic ray tagger system, we measure D L = 3.74 +0.28 -0.29 cm 2 /s. %0Journal Article